sphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget(/translations/zh_CN/networking/ip-sysctlmodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/zh_TW/networking/ip-sysctlmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/it_IT/networking/ip-sysctlmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/ja_JP/networking/ip-sysctlmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/ko_KR/networking/ip-sysctlmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget(/translations/sp_SP/networking/ip-sysctlmodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhcomment)}(h SPDX-License-Identifier: GPL-2.0h]h SPDX-License-Identifier: GPL-2.0}hhsbah}(h]h ]h"]h$]h&] xml:spacepreserveuh1hhhhhhB/var/lib/git/docbuild/linux/Documentation/networking/ip-sysctl.rsthKubhsection)}(hhh](htitle)}(h IP Sysctlh]h IP Sysctl}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(h/proc/sys/net/ipv4/* Variablesh]h/proc/sys/net/ipv4/* Variables}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubhdefinition_list)}(hhh](hdefinition_list_item)}(hip_forward - BOOLEAN - 0 - disabled (default) - not 0 - enabled Forward Packets between interfaces. This variable is special, its change resets all configuration parameters to their default state (RFC1122 for hosts, RFC1812 for routers) h](hterm)}(hip_forward - BOOLEANh]hip_forward - BOOLEAN}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhubh definition)}(hhh](h bullet_list)}(hhh](h list_item)}(h0 - disabled (default)h]h paragraph)}(hjh]h0 - disabled (default)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK hjubah}(h]h ]h"]h$]h&]uh1hhhubj)}(hnot 0 - enabled h]j)}(hnot 0 - enabledh]hnot 0 - enabled}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK hjubah}(h]h ]h"]h$]h&]uh1hhhubeh}(h]h ]h"]h$]h&]bullet-uh1hhhhK hhubj)}(h#Forward Packets between interfaces.h]h#Forward Packets between interfaces.}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhhubj)}(hThis variable is special, its change resets all configuration parameters to their default state (RFC1122 for hosts, RFC1812 for routers)h]hThis variable is special, its change resets all configuration parameters to their default state (RFC1122 for hosts, RFC1812 for routers)}(hjHhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhhubeh}(h]h ]h"]h$]h&]uh1hhhubeh}(h]h ]h"]h$]h&]uh1hhhhKhhubh)}(hip_default_ttl - INTEGER Default value of TTL field (Time To Live) for outgoing (but not forwarded) IP packets. Should be between 1 and 255 inclusive. Default: 64 (as recommended by RFC1700) h](h)}(hip_default_ttl - INTEGERh]hip_default_ttl - INTEGER}(hjfhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjbubh)}(hhh]j)}(hDefault value of TTL field (Time To Live) for outgoing (but not forwarded) IP packets. Should be between 1 and 255 inclusive. Default: 64 (as recommended by RFC1700)h]hDefault value of TTL field (Time To Live) for outgoing (but not forwarded) IP packets. Should be between 1 and 255 inclusive. Default: 64 (as recommended by RFC1700)}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjtubah}(h]h ]h"]h$]h&]uh1hhjbubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hXip_no_pmtu_disc - INTEGER Disable Path MTU Discovery. If enabled in mode 1 and a fragmentation-required ICMP is received, the PMTU to this destination will be set to the smallest of the old MTU to this destination and min_pmtu (see below). You will need to raise min_pmtu to the smallest interface MTU on your system manually if you want to avoid locally generated fragments. In mode 2 incoming Path MTU Discovery messages will be discarded. Outgoing frames are handled the same as in mode 1, implicitly setting IP_PMTUDISC_DONT on every created socket. Mode 3 is a hardened pmtu discover mode. The kernel will only accept fragmentation-needed errors if the underlying protocol can verify them besides a plain socket lookup. Current protocols for which pmtu events will be honored are TCP, SCTP and DCCP as they verify e.g. the sequence number or the association. This mode should not be enabled globally but is only intended to secure e.g. name servers in namespaces where TCP path mtu must still work but path MTU information of other protocols should be discarded. If enabled globally this mode could break other protocols. Possible values: 0-3 Default: FALSE h](h)}(hip_no_pmtu_disc - INTEGERh]hip_no_pmtu_disc - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK2hjubh)}(hhh](j)}(hX]Disable Path MTU Discovery. If enabled in mode 1 and a fragmentation-required ICMP is received, the PMTU to this destination will be set to the smallest of the old MTU to this destination and min_pmtu (see below). You will need to raise min_pmtu to the smallest interface MTU on your system manually if you want to avoid locally generated fragments.h]hX]Disable Path MTU Discovery. If enabled in mode 1 and a fragmentation-required ICMP is received, the PMTU to this destination will be set to the smallest of the old MTU to this destination and min_pmtu (see below). You will need to raise min_pmtu to the smallest interface MTU on your system manually if you want to avoid locally generated fragments.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubj)}(hIn mode 2 incoming Path MTU Discovery messages will be discarded. Outgoing frames are handled the same as in mode 1, implicitly setting IP_PMTUDISC_DONT on every created socket.h]hIn mode 2 incoming Path MTU Discovery messages will be discarded. Outgoing frames are handled the same as in mode 1, implicitly setting IP_PMTUDISC_DONT on every created socket.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK!hjubj)}(hX<Mode 3 is a hardened pmtu discover mode. The kernel will only accept fragmentation-needed errors if the underlying protocol can verify them besides a plain socket lookup. Current protocols for which pmtu events will be honored are TCP, SCTP and DCCP as they verify e.g. the sequence number or the association. This mode should not be enabled globally but is only intended to secure e.g. name servers in namespaces where TCP path mtu must still work but path MTU information of other protocols should be discarded. If enabled globally this mode could break other protocols.h]hX<Mode 3 is a hardened pmtu discover mode. The kernel will only accept fragmentation-needed errors if the underlying protocol can verify them besides a plain socket lookup. Current protocols for which pmtu events will be honored are TCP, SCTP and DCCP as they verify e.g. the sequence number or the association. This mode should not be enabled globally but is only intended to secure e.g. name servers in namespaces where TCP path mtu must still work but path MTU information of other protocols should be discarded. If enabled globally this mode could break other protocols.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK%hjubj)}(hPossible values: 0-3h]hPossible values: 0-3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK0hjubj)}(hDefault: FALSEh]hDefault: FALSE}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK2hjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhK2hhhhubh)}(hmin_pmtu - INTEGER default 552 - minimum Path MTU. Unless this is changed manually, each cached pmtu will never be lower than this setting. h](h)}(hmin_pmtu - INTEGERh]hmin_pmtu - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK6hjubh)}(hhh]j)}(hxdefault 552 - minimum Path MTU. Unless this is changed manually, each cached pmtu will never be lower than this setting.h]hxdefault 552 - minimum Path MTU. Unless this is changed manually, each cached pmtu will never be lower than this setting.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK5hj ubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhK6hhhhubh)}(hXip_forward_use_pmtu - BOOLEAN By default we don't trust protocol path MTUs while forwarding because they could be easily forged and can lead to unwanted fragmentation by the router. You only need to enable this if you have user-space software which tries to discover path mtus by itself and depends on the kernel honoring this information. This is normally not the case. Default: 0 (disabled) Possible values: - 0 - disabled - 1 - enabled h](h)}(hip_forward_use_pmtu - BOOLEANh]hip_forward_use_pmtu - BOOLEAN}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKFhj'ubh)}(hhh](j)}(hXTBy default we don't trust protocol path MTUs while forwarding because they could be easily forged and can lead to unwanted fragmentation by the router. You only need to enable this if you have user-space software which tries to discover path mtus by itself and depends on the kernel honoring this information. This is normally not the case.h]hXVBy default we don’t trust protocol path MTUs while forwarding because they could be easily forged and can lead to unwanted fragmentation by the router. You only need to enable this if you have user-space software which tries to discover path mtus by itself and depends on the kernel honoring this information. This is normally not the case.}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK9hj9ubj)}(hDefault: 0 (disabled)h]hDefault: 0 (disabled)}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKAhj9ubj)}(hPossible values:h]hPossible values:}(hjXhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKChj9ubh)}(hhh](j)}(h 0 - disabledh]j)}(hjkh]h 0 - disabled}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKEhjiubah}(h]h ]h"]h$]h&]uh1hhjfubj)}(h 1 - enabled h]j)}(h 1 - enabledh]h 1 - enabled}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKFhjubah}(h]h ]h"]h$]h&]uh1hhjfubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhKEhj9ubeh}(h]h ]h"]h$]h&]uh1hhj'ubeh}(h]h ]h"]h$]h&]uh1hhhhKFhhhhubh)}(hX#fwmark_reflect - BOOLEAN Controls the fwmark of kernel-generated IPv4 reply packets that are not associated with a socket for example, TCP RSTs or ICMP echo replies). If unset, these packets have a fwmark of zero. If set, they have the fwmark of the packet they are replying to. Default: 0 h](h)}(hfwmark_reflect - BOOLEANh]hfwmark_reflect - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKNhjubh)}(hhh](j)}(hControls the fwmark of kernel-generated IPv4 reply packets that are not associated with a socket for example, TCP RSTs or ICMP echo replies). If unset, these packets have a fwmark of zero. If set, they have the fwmark of the packet they are replying to.h]hControls the fwmark of kernel-generated IPv4 reply packets that are not associated with a socket for example, TCP RSTs or ICMP echo replies). If unset, these packets have a fwmark of zero. If set, they have the fwmark of the packet they are replying to.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKIhjubj)}(h Default: 0h]h Default: 0}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKNhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhKNhhhhubh)}(hXdfib_multipath_use_neigh - BOOLEAN Use status of existing neighbor entry when determining nexthop for multipath routes. If disabled, neighbor information is not used and packets could be directed to a failed nexthop. Only valid for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled. Default: 0 (disabled) Possible values: - 0 - disabled - 1 - enabled h](h)}(h!fib_multipath_use_neigh - BOOLEANh]h!fib_multipath_use_neigh - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK[hjubh)}(hhh](j)}(hUse status of existing neighbor entry when determining nexthop for multipath routes. If disabled, neighbor information is not used and packets could be directed to a failed nexthop. Only valid for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled.h]hUse status of existing neighbor entry when determining nexthop for multipath routes. If disabled, neighbor information is not used and packets could be directed to a failed nexthop. Only valid for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKQhjubj)}(hDefault: 0 (disabled)h]hDefault: 0 (disabled)}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKVhjubj)}(hPossible values:h]hPossible values:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKXhjubh)}(hhh](j)}(h 0 - disabledh]j)}(hj+h]h 0 - disabled}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKZhj)ubah}(h]h ]h"]h$]h&]uh1hhj&ubj)}(h 1 - enabled h]j)}(h 1 - enabledh]h 1 - enabled}(hjDhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK[hj@ubah}(h]h ]h"]h$]h&]uh1hhj&ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhKZhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhK[hhhhubh)}(hXfib_multipath_hash_policy - INTEGER Controls which hash policy to use for multipath routes. Only valid for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled. Default: 0 (Layer 3) Possible values: - 0 - Layer 3 - 1 - Layer 4 - 2 - Layer 3 or inner Layer 3 if present - 3 - Custom multipath hash. Fields used for multipath hash calculation are determined by fib_multipath_hash_fields sysctl h](h)}(h#fib_multipath_hash_policy - INTEGERh]h#fib_multipath_hash_policy - INTEGER}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKihjjubh)}(hhh](j)}(h|Controls which hash policy to use for multipath routes. Only valid for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled.h]h|Controls which hash policy to use for multipath routes. Only valid for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK^hj|ubj)}(hDefault: 0 (Layer 3)h]hDefault: 0 (Layer 3)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKahj|ubj)}(hPossible values:h]hPossible values:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKchj|ubh)}(hhh](j)}(h 0 - Layer 3h]j)}(hjh]h 0 - Layer 3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKehjubah}(h]h ]h"]h$]h&]uh1hhjubj)}(h 1 - Layer 4h]j)}(hjh]h 1 - Layer 4}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKfhjubah}(h]h ]h"]h$]h&]uh1hhjubj)}(h'2 - Layer 3 or inner Layer 3 if presenth]j)}(hjh]h'2 - Layer 3 or inner Layer 3 if present}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKghjubah}(h]h ]h"]h$]h&]uh1hhjubj)}(hy3 - Custom multipath hash. Fields used for multipath hash calculation are determined by fib_multipath_hash_fields sysctl h]j)}(hx3 - Custom multipath hash. Fields used for multipath hash calculation are determined by fib_multipath_hash_fields sysctlh]hx3 - Custom multipath hash. Fields used for multipath hash calculation are determined by fib_multipath_hash_fields sysctl}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhKehj|ubeh}(h]h ]h"]h$]h&]uh1hhjjubeh}(h]h ]h"]h$]h&]uh1hhhhKihhhhubh)}(hXfib_multipath_hash_fields - UNSIGNED INTEGER When fib_multipath_hash_policy is set to 3 (custom multipath hash), the fields used for multipath hash calculation are determined by this sysctl. This value is a bitmask which enables various fields for multipath hash calculation. Possible fields are: ====== ============================ 0x0001 Source IP address 0x0002 Destination IP address 0x0004 IP protocol 0x0008 Unused (Flow Label) 0x0010 Source port 0x0020 Destination port 0x0040 Inner source IP address 0x0080 Inner destination IP address 0x0100 Inner IP protocol 0x0200 Inner Flow Label 0x0400 Inner source port 0x0800 Inner destination port ====== ============================ Default: 0x0007 (source IP, destination IP and IP protocol) h](h)}(h,fib_multipath_hash_fields - UNSIGNED INTEGERh]h,fib_multipath_hash_fields - UNSIGNED INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubh)}(hhh](j)}(hWhen fib_multipath_hash_policy is set to 3 (custom multipath hash), the fields used for multipath hash calculation are determined by this sysctl.h]hWhen fib_multipath_hash_policy is set to 3 (custom multipath hash), the fields used for multipath hash calculation are determined by this sysctl.}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKlhj-ubj)}(hTThis value is a bitmask which enables various fields for multipath hash calculation.h]hTThis value is a bitmask which enables various fields for multipath hash calculation.}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKphj-ubj)}(hPossible fields are:h]hPossible fields are:}(hjLhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKshj-ubhtable)}(hhh]htgroup)}(hhh](hcolspec)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjaubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjaubhtbody)}(hhh](hrow)}(hhh](hentry)}(hhh]j)}(h0x0001h]h0x0001}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKvhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(hSource IP addressh]hSource IP address}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKvhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0002h]h0x0002}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKwhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(hDestination IP addressh]hDestination IP address}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKwhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0004h]h0x0004}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKxhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(h IP protocolh]h IP protocol}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKxhj ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0008h]h0x0008}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKyhj+ubah}(h]h ]h"]h$]h&]uh1jhj(ubj)}(hhh]j)}(hUnused (Flow Label)h]hUnused (Flow Label)}(hjEhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKyhjBubah}(h]h ]h"]h$]h&]uh1jhj(ubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0010h]h0x0010}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKzhjbubah}(h]h ]h"]h$]h&]uh1jhj_ubj)}(hhh]j)}(h Source porth]h Source port}(hj|hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKzhjyubah}(h]h ]h"]h$]h&]uh1jhj_ubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0020h]h0x0020}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK{hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(hDestination porth]hDestination port}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK{hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0040h]h0x0040}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK|hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(hInner source IP addressh]hInner source IP address}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK|hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0080h]h0x0080}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK}hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(hInner destination IP addressh]hInner destination IP address}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK}hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0100h]h0x0100}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK~hj>ubah}(h]h ]h"]h$]h&]uh1jhj;ubj)}(hhh]j)}(hInner IP protocolh]hInner IP protocol}(hjXhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhK~hjUubah}(h]h ]h"]h$]h&]uh1jhj;ubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0200h]h0x0200}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjuubah}(h]h ]h"]h$]h&]uh1jhjrubj)}(hhh]j)}(hInner Flow Labelh]hInner Flow Label}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjrubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0400h]h0x0400}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(hInner source porth]hInner source port}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj|ubj)}(hhh](j)}(hhh]j)}(h0x0800h]h0x0800}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(hInner destination porth]hInner destination port}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj|ubeh}(h]h ]h"]h$]h&]uh1jzhjaubeh}(h]h ]h"]h$]h&]colsKuh1j_hj\ubah}(h]h ]h"]h$]h&]uh1jZhj-ubj)}(h;Default: 0x0007 (source IP, destination IP and IP protocol)h]h;Default: 0x0007 (source IP, destination IP and IP protocol)}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj-ubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hXfib_multipath_hash_seed - UNSIGNED INTEGER The seed value used when calculating hash for multipath routes. Applies to both IPv4 and IPv6 datapath. Only present for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled. When set to 0, the seed value used for multipath routing defaults to an internal random-generated one. The actual hashing algorithm is not specified -- there is no guarantee that a next hop distribution effected by a given seed will keep stable across kernel versions. Default: 0 (random) h](h)}(h*fib_multipath_hash_seed - UNSIGNED INTEGERh]h*fib_multipath_hash_seed - UNSIGNED INTEGER}(hjHhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjDubh)}(hhh](j)}(hThe seed value used when calculating hash for multipath routes. Applies to both IPv4 and IPv6 datapath. Only present for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled.h]hThe seed value used when calculating hash for multipath routes. Applies to both IPv4 and IPv6 datapath. Only present for kernels built with CONFIG_IP_ROUTE_MULTIPATH enabled.}(hjYhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjVubj)}(hfWhen set to 0, the seed value used for multipath routing defaults to an internal random-generated one.h]hfWhen set to 0, the seed value used for multipath routing defaults to an internal random-generated one.}(hjghhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjVubj)}(hThe actual hashing algorithm is not specified -- there is no guarantee that a next hop distribution effected by a given seed will keep stable across kernel versions.h]hThe actual hashing algorithm is not specified -- there is no guarantee that a next hop distribution effected by a given seed will keep stable across kernel versions.}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjVubj)}(hDefault: 0 (random)h]hDefault: 0 (random)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjVubeh}(h]h ]h"]h$]h&]uh1hhjDubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hfib_sync_mem - UNSIGNED INTEGER Amount of dirty memory from fib entries that can be backlogged before synchronize_rcu is forced. Default: 512kB Minimum: 64kB Maximum: 64MB h](h)}(hfib_sync_mem - UNSIGNED INTEGERh]hfib_sync_mem - UNSIGNED INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubh)}(hhh](j)}(h`Amount of dirty memory from fib entries that can be backlogged before synchronize_rcu is forced.h]h`Amount of dirty memory from fib entries that can be backlogged before synchronize_rcu is forced.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubj)}(h.Default: 512kB Minimum: 64kB Maximum: 64MBh]h.Default: 512kB Minimum: 64kB Maximum: 64MB}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hXTip_forward_update_priority - INTEGER Whether to update SKB priority from "TOS" field in IPv4 header after it is forwarded. The new SKB priority is mapped from TOS field value according to an rt_tos2priority table (see e.g. man tc-prio). Default: 1 (Update priority.) Possible values: - 0 - Do not update priority. - 1 - Update priority. h](h)}(h$ip_forward_update_priority - INTEGERh]h$ip_forward_update_priority - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubh)}(hhh](j)}(hWhether to update SKB priority from "TOS" field in IPv4 header after it is forwarded. The new SKB priority is mapped from TOS field value according to an rt_tos2priority table (see e.g. man tc-prio).h]hWhether to update SKB priority from “TOS” field in IPv4 header after it is forwarded. The new SKB priority is mapped from TOS field value according to an rt_tos2priority table (see e.g. man tc-prio).}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubj)}(hDefault: 1 (Update priority.)h]hDefault: 1 (Update priority.)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubj)}(hPossible values:h]hPossible values:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubh)}(hhh](j)}(h0 - Do not update priority.h]j)}(hjh]h0 - Do not update priority.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubah}(h]h ]h"]h$]h&]uh1hhjubj)}(h1 - Update priority. h]j)}(h1 - Update priority.h]h1 - Update priority.}(hj7hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj3ubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhKhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hX\route/max_size - INTEGER Maximum number of routes allowed in the kernel. Increase this when using large numbers of interfaces and/or routes. From linux kernel 3.6 onwards, this is deprecated for ipv4 as route cache is no longer used. From linux kernel 6.3 onwards, this is deprecated for ipv6 as garbage collection manages cached route entries. h](h)}(hroute/max_size - INTEGERh]hroute/max_size - INTEGER}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj]ubh)}(hhh](j)}(htMaximum number of routes allowed in the kernel. Increase this when using large numbers of interfaces and/or routes.h]htMaximum number of routes allowed in the kernel. Increase this when using large numbers of interfaces and/or routes.}(hjrhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjoubj)}(h\From linux kernel 3.6 onwards, this is deprecated for ipv4 as route cache is no longer used.h]h\From linux kernel 3.6 onwards, this is deprecated for ipv4 as route cache is no longer used.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjoubj)}(hnFrom linux kernel 6.3 onwards, this is deprecated for ipv6 as garbage collection manages cached route entries.h]hnFrom linux kernel 6.3 onwards, this is deprecated for ipv6 as garbage collection manages cached route entries.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjoubeh}(h]h ]h"]h$]h&]uh1hhj]ubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hneigh/default/gc_thresh1 - INTEGER Minimum number of entries to keep. Garbage collector will not purge entries if there are fewer than this number. Default: 128 h](h)}(h"neigh/default/gc_thresh1 - INTEGERh]h"neigh/default/gc_thresh1 - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubh)}(hhh](j)}(hqMinimum number of entries to keep. Garbage collector will not purge entries if there are fewer than this number.h]hqMinimum number of entries to keep. Garbage collector will not purge entries if there are fewer than this number.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubj)}(h Default: 128h]h Default: 128}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hneigh/default/gc_thresh2 - INTEGER Threshold when garbage collector becomes more aggressive about purging entries. Entries older than 5 seconds will be cleared when over this number. Default: 512 h](h)}(h"neigh/default/gc_thresh2 - INTEGERh]h"neigh/default/gc_thresh2 - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubh)}(hhh](j)}(hThreshold when garbage collector becomes more aggressive about purging entries. Entries older than 5 seconds will be cleared when over this number.h]hThreshold when garbage collector becomes more aggressive about purging entries. Entries older than 5 seconds will be cleared when over this number.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubj)}(h Default: 512h]h Default: 512}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hneigh/default/gc_thresh3 - INTEGER Maximum number of non-PERMANENT neighbor entries allowed. Increase this when using large numbers of interfaces and when communicating with large numbers of directly-connected peers. Default: 1024 h](h)}(h"neigh/default/gc_thresh3 - INTEGERh]h"neigh/default/gc_thresh3 - INTEGER}(hj& hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj" ubh)}(hhh](j)}(hMaximum number of non-PERMANENT neighbor entries allowed. Increase this when using large numbers of interfaces and when communicating with large numbers of directly-connected peers.h]hMaximum number of non-PERMANENT neighbor entries allowed. Increase this when using large numbers of interfaces and when communicating with large numbers of directly-connected peers.}(hj7 hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj4 ubj)}(h Default: 1024h]h Default: 1024}(hjE hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhj4 ubeh}(h]h ]h"]h$]h&]uh1hhj" ubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hXneigh/default/unres_qlen_bytes - INTEGER The maximum number of bytes which may be used by packets queued for each unresolved address by other network layers. (added in linux 3.3) Setting negative value is meaningless and will return error. Default: SK_WMEM_MAX, (same as net.core.wmem_default). Exact value depends on architecture and kernel options, but should be enough to allow queuing 256 packets of medium size. h](h)}(h(neigh/default/unres_qlen_bytes - INTEGERh]h(neigh/default/unres_qlen_bytes - INTEGER}(hjc hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj_ ubh)}(hhh](j)}(hThe maximum number of bytes which may be used by packets queued for each unresolved address by other network layers. (added in linux 3.3)h]hThe maximum number of bytes which may be used by packets queued for each unresolved address by other network layers. (added in linux 3.3)}(hjt hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhKhjq ubj)}(h ubh)}(hXwtcp_abort_on_overflow - BOOLEAN If listening service is too slow to accept new connections, reset them. Default state is FALSE. It means that if overflow occurred due to a burst, connection will recover. Enable this option _only_ if you are really sure that listening daemon cannot be tuned to accept connections faster. Enabling this option can harm clients of your server. h](h)}(htcp_abort_on_overflow - BOOLEANh]htcp_abort_on_overflow - BOOLEAN}(hjt hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMOhjp ubh)}(hhh]j)}(hXVIf listening service is too slow to accept new connections, reset them. Default state is FALSE. It means that if overflow occurred due to a burst, connection will recover. Enable this option _only_ if you are really sure that listening daemon cannot be tuned to accept connections faster. Enabling this option can harm clients of your server.h]hXVIf listening service is too slow to accept new connections, reset them. Default state is FALSE. It means that if overflow occurred due to a burst, connection will recover. Enable this option _only_ if you are really sure that listening daemon cannot be tuned to accept connections faster. Enabling this option can harm clients of your server.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMJhj ubah}(h]h ]h"]h$]h&]uh1hhjp ubeh}(h]h ]h"]h$]h&]uh1hhhhMOhj> hhubh)}(htcp_adv_win_scale - INTEGER Obsolete since linux-6.6 Count buffering overhead as bytes/2^tcp_adv_win_scale (if tcp_adv_win_scale > 0) or bytes-bytes/2^(-tcp_adv_win_scale), if it is <= 0. Possible values are [-31, 31], inclusive. Default: 1 h](h)}(htcp_adv_win_scale - INTEGERh]htcp_adv_win_scale - INTEGER}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMYhj ubh)}(hhh](j)}(hObsolete since linux-6.6 Count buffering overhead as bytes/2^tcp_adv_win_scale (if tcp_adv_win_scale > 0) or bytes-bytes/2^(-tcp_adv_win_scale), if it is <= 0.h]hObsolete since linux-6.6 Count buffering overhead as bytes/2^tcp_adv_win_scale (if tcp_adv_win_scale > 0) or bytes-bytes/2^(-tcp_adv_win_scale), if it is <= 0.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMRhj ubj)}(h)Possible values are [-31, 31], inclusive.h]h)Possible values are [-31, 31], inclusive.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMWhj ubj)}(h Default: 1h]h Default: 1}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMYhj ubeh}(h]h ]h"]h$]h&]uh1hhj ubeh}(h]h ]h"]h$]h&]uh1hhhhMYhj> hhubh)}(hXtcp_allowed_congestion_control - STRING Show/set the congestion control choices available to non-privileged processes. The list is a subset of those listed in tcp_available_congestion_control. Default is "reno" and the default setting (tcp_congestion_control). h](h)}(h'tcp_allowed_congestion_control - STRINGh]h'tcp_allowed_congestion_control - STRING}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM`hj ubh)}(hhh](j)}(hShow/set the congestion control choices available to non-privileged processes. The list is a subset of those listed in tcp_available_congestion_control.h]hShow/set the congestion control choices available to non-privileged processes. The list is a subset of those listed in tcp_available_congestion_control.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM\hj ubj)}(hCDefault is "reno" and the default setting (tcp_congestion_control).h]hGDefault is “reno” and the default setting (tcp_congestion_control).}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM`hj ubeh}(h]h ]h"]h$]h&]uh1hhj ubeh}(h]h ]h"]h$]h&]uh1hhhhM`hj> hhubh)}(htcp_app_win - INTEGER Reserve max(window/2^tcp_app_win, mss) of window for application buffer. Value 0 is special, it means that nothing is reserved. Possible values are [0, 31], inclusive. Default: 31 h](h)}(htcp_app_win - INTEGERh]htcp_app_win - INTEGER}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhhj'ubh)}(hhh](j)}(hReserve max(window/2^tcp_app_win, mss) of window for application buffer. Value 0 is special, it means that nothing is reserved.h]hReserve max(window/2^tcp_app_win, mss) of window for application buffer. Value 0 is special, it means that nothing is reserved.}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMchj9ubj)}(h'Possible values are [0, 31], inclusive.h]h'Possible values are [0, 31], inclusive.}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMfhj9ubj)}(h Default: 31h]h Default: 31}(hjXhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhhj9ubeh}(h]h ]h"]h$]h&]uh1hhj'ubeh}(h]h ]h"]h$]h&]uh1hhhhMhhj> hhubh)}(hXtcp_autocorking - BOOLEAN Enable TCP auto corking : When applications do consecutive small write()/sendmsg() system calls, we try to coalesce these small writes as much as possible, to lower total amount of sent packets. This is done if at least one prior packet for the flow is waiting in Qdisc queues or device transmit queue. Applications can still use TCP_CORK for optimal behavior when they know how/when to uncork their sockets. Default : 1 h](h)}(htcp_autocorking - BOOLEANh]htcp_autocorking - BOOLEAN}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMshjrubh)}(hhh](j)}(hXEnable TCP auto corking : When applications do consecutive small write()/sendmsg() system calls, we try to coalesce these small writes as much as possible, to lower total amount of sent packets. This is done if at least one prior packet for the flow is waiting in Qdisc queues or device transmit queue. Applications can still use TCP_CORK for optimal behavior when they know how/when to uncork their sockets.h]hXEnable TCP auto corking : When applications do consecutive small write()/sendmsg() system calls, we try to coalesce these small writes as much as possible, to lower total amount of sent packets. This is done if at least one prior packet for the flow is waiting in Qdisc queues or device transmit queue. Applications can still use TCP_CORK for optimal behavior when they know how/when to uncork their sockets.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMkhjubj)}(h Default : 1h]h Default : 1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMshjubeh}(h]h ]h"]h$]h&]uh1hhjrubeh}(h]h ]h"]h$]h&]uh1hhhhMshj> hhubh)}(htcp_available_congestion_control - STRING Shows the available congestion control choices that are registered. More congestion control algorithms may be available as modules, but not loaded. h](h)}(h)tcp_available_congestion_control - STRINGh]h)tcp_available_congestion_control - STRING}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMxhjubh)}(hhh]j)}(hShows the available congestion control choices that are registered. More congestion control algorithms may be available as modules, but not loaded.h]hShows the available congestion control choices that are registered. More congestion control algorithms may be available as modules, but not loaded.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMvhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMxhj> hhubh)}(htcp_base_mss - INTEGER The initial value of search_low to be used by the packetization layer Path MTU discovery (MTU probing). If MTU probing is enabled, this is the initial MSS used by the connection. h](h)}(htcp_base_mss - INTEGERh]htcp_base_mss - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM}hjubh)}(hhh]j)}(hThe initial value of search_low to be used by the packetization layer Path MTU discovery (MTU probing). If MTU probing is enabled, this is the initial MSS used by the connection.h]hThe initial value of search_low to be used by the packetization layer Path MTU discovery (MTU probing). If MTU probing is enabled, this is the initial MSS used by the connection.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM{hjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhM}hj> hhubh)}(htcp_mtu_probe_floor - INTEGER If MTU probing is enabled this caps the minimum MSS used for search_low for the connection. Default : 48 h](h)}(htcp_mtu_probe_floor - INTEGERh]htcp_mtu_probe_floor - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubh)}(hhh](j)}(h[If MTU probing is enabled this caps the minimum MSS used for search_low for the connection.h]h[If MTU probing is enabled this caps the minimum MSS used for search_low for the connection.}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h Default : 48h]h Default : 48}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhj ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_min_snd_mss - INTEGER TCP SYN and SYNACK messages usually advertise an ADVMSS option, as described in RFC 1122 and RFC 6691. If this ADVMSS option is smaller than tcp_min_snd_mss, it is silently capped to tcp_min_snd_mss. Default : 48 (at least 8 bytes of payload per segment) h](h)}(htcp_min_snd_mss - INTEGERh]htcp_min_snd_mss - INTEGER}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjJubh)}(hhh](j)}(hfTCP SYN and SYNACK messages usually advertise an ADVMSS option, as described in RFC 1122 and RFC 6691.h]hfTCP SYN and SYNACK messages usually advertise an ADVMSS option, as described in RFC 1122 and RFC 6691.}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj\ubj)}(h`If this ADVMSS option is smaller than tcp_min_snd_mss, it is silently capped to tcp_min_snd_mss.h]h`If this ADVMSS option is smaller than tcp_min_snd_mss, it is silently capped to tcp_min_snd_mss.}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj\ubj)}(h6Default : 48 (at least 8 bytes of payload per segment)h]h6Default : 48 (at least 8 bytes of payload per segment)}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj\ubeh}(h]h ]h"]h$]h&]uh1hhjJubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_congestion_control - STRING Set the congestion control algorithm to be used for new connections. The algorithm "reno" is always available, but additional choices may be available based on kernel configuration. Default is set as part of kernel configuration. For passive connections, the listener congestion control choice is inherited. [see setsockopt(listenfd, SOL_TCP, TCP_CONGESTION, "name" ...) ] h](h)}(htcp_congestion_control - STRINGh]htcp_congestion_control - STRING}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hX3Set the congestion control algorithm to be used for new connections. The algorithm "reno" is always available, but additional choices may be available based on kernel configuration. Default is set as part of kernel configuration. For passive connections, the listener congestion control choice is inherited.h]hX7Set the congestion control algorithm to be used for new connections. The algorithm “reno” is always available, but additional choices may be available based on kernel configuration. Default is set as part of kernel configuration. For passive connections, the listener congestion control choice is inherited.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h@[see setsockopt(listenfd, SOL_TCP, TCP_CONGESTION, "name" ...) ]h]hD[see setsockopt(listenfd, SOL_TCP, TCP_CONGESTION, “name” ...) ]}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(h:tcp_dsack - BOOLEAN Allows TCP to send "duplicate" SACKs. h](h)}(htcp_dsack - BOOLEANh]htcp_dsack - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh]j)}(h%Allows TCP to send "duplicate" SACKs.h]h)Allows TCP to send “duplicate” SACKs.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hX'tcp_early_retrans - INTEGER Tail loss probe (TLP) converts RTOs occurring due to tail losses into fast recovery (draft-ietf-tcpm-rack). Note that TLP requires RACK to function properly (see tcp_recovery below) Possible values: - 0 disables TLP - 3 or 4 enables TLP Default: 3 h](h)}(htcp_early_retrans - INTEGERh]htcp_early_retrans - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hTail loss probe (TLP) converts RTOs occurring due to tail losses into fast recovery (draft-ietf-tcpm-rack). Note that TLP requires RACK to function properly (see tcp_recovery below)h]hTail loss probe (TLP) converts RTOs occurring due to tail losses into fast recovery (draft-ietf-tcpm-rack). Note that TLP requires RACK to function properly (see tcp_recovery below)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hPossible values:h]hPossible values:}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj )}(h&- 0 disables TLP - 3 or 4 enables TLP h]h)}(hhh](j)}(h0 disables TLPh]j)}(hj;h]h0 disables TLP}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj9ubah}(h]h ]h"]h$]h&]uh1hhj6ubj)}(h3 or 4 enables TLP h]j)}(h3 or 4 enables TLPh]h3 or 4 enables TLP}(hjThhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjPubah}(h]h ]h"]h$]h&]uh1hhj6ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhj2ubah}(h]h ]h"]h$]h&]uh1j hhhMhjubj)}(h Default: 3h]h Default: 3}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_ecn - INTEGER Control use of Explicit Congestion Notification (ECN) by TCP. ECN is used only when both ends of the TCP connection indicate support for it. This feature is useful in avoiding losses due to congestion by allowing supporting routers to signal congestion before having to drop packets. Possible values are: = ===================================================== 0 Disable ECN. Neither initiate nor accept ECN. 1 Enable ECN when requested by incoming connections and also request ECN on outgoing connection attempts. 2 Enable ECN when requested by incoming connections but do not request ECN on outgoing connections. = ===================================================== Default: 2 h](h)}(htcp_ecn - INTEGERh]htcp_ecn - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hXControl use of Explicit Congestion Notification (ECN) by TCP. ECN is used only when both ends of the TCP connection indicate support for it. This feature is useful in avoiding losses due to congestion by allowing supporting routers to signal congestion before having to drop packets.h]hXControl use of Explicit Congestion Notification (ECN) by TCP. ECN is used only when both ends of the TCP connection indicate support for it. This feature is useful in avoiding losses due to congestion by allowing supporting routers to signal congestion before having to drop packets.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hPossible values are:h]hPossible values are:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj )}(hXz= ===================================================== 0 Disable ECN. Neither initiate nor accept ECN. 1 Enable ECN when requested by incoming connections and also request ECN on outgoing connection attempts. 2 Enable ECN when requested by incoming connections but do not request ECN on outgoing connections. = ===================================================== h]j[)}(hhh]j`)}(hhh](je)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthK5uh1jdhjubj{)}(hhh](j)}(hhh](j)}(hhh]j)}(h0h]h0}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(h.Disable ECN. Neither initiate nor accept ECN.h]h.Disable ECN. Neither initiate nor accept ECN.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]j)}(h1h]h1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(hgEnable ECN when requested by incoming connections and also request ECN on outgoing connection attempts.h]hgEnable ECN when requested by incoming connections and also request ECN on outgoing connection attempts.}(hj4hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj1ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]j)}(h2h]h2}(hjThhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjQubah}(h]h ]h"]h$]h&]uh1jhjNubj)}(hhh]j)}(haEnable ECN when requested by incoming connections but do not request ECN on outgoing connections.h]haEnable ECN when requested by incoming connections but do not request ECN on outgoing connections.}(hjkhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjhubah}(h]h ]h"]h$]h&]uh1jhjNubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jzhjubeh}(h]h ]h"]h$]h&]colsKuh1j_hjubah}(h]h ]h"]h$]h&]uh1jZhjubah}(h]h ]h"]h$]h&]uh1j hhhMhjubj)}(h Default: 2h]h Default: 2}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_ecn_fallback - BOOLEAN If the kernel detects that ECN connection misbehaves, enable fall back to non-ECN. Currently, this knob implements the fallback from RFC3168, section 6.1.1.1., but we reserve that in future, additional detection mechanisms could be implemented under this knob. The value is not used, if tcp_ecn or per route (or congestion control) ECN settings are disabled. Default: 1 (fallback enabled) h](h)}(htcp_ecn_fallback - BOOLEANh]htcp_ecn_fallback - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hXfIf the kernel detects that ECN connection misbehaves, enable fall back to non-ECN. Currently, this knob implements the fallback from RFC3168, section 6.1.1.1., but we reserve that in future, additional detection mechanisms could be implemented under this knob. The value is not used, if tcp_ecn or per route (or congestion control) ECN settings are disabled.h]hXfIf the kernel detects that ECN connection misbehaves, enable fall back to non-ECN. Currently, this knob implements the fallback from RFC3168, section 6.1.1.1., but we reserve that in future, additional detection mechanisms could be implemented under this knob. The value is not used, if tcp_ecn or per route (or congestion control) ECN settings are disabled.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hDefault: 1 (fallback enabled)h]hDefault: 1 (fallback enabled)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hFtcp_fack - BOOLEAN This is a legacy option, it has no effect anymore. h](h)}(htcp_fack - BOOLEANh]htcp_fack - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh]j)}(h2This is a legacy option, it has no effect anymore.h]h2This is a legacy option, it has no effect anymore.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_fin_timeout - INTEGER The length of time an orphaned (no longer referenced by any application) connection will remain in the FIN_WAIT_2 state before it is aborted at the local end. While a perfectly valid "receive only" state for an un-orphaned connection, an orphaned connection in FIN_WAIT_2 state could otherwise wait forever for the remote to close its end of the connection. Cf. tcp_max_orphans Default: 60 seconds h](h)}(htcp_fin_timeout - INTEGERh]htcp_fin_timeout - INTEGER}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj$ubh)}(hhh](j)}(hXfThe length of time an orphaned (no longer referenced by any application) connection will remain in the FIN_WAIT_2 state before it is aborted at the local end. While a perfectly valid "receive only" state for an un-orphaned connection, an orphaned connection in FIN_WAIT_2 state could otherwise wait forever for the remote to close its end of the connection.h]hXjThe length of time an orphaned (no longer referenced by any application) connection will remain in the FIN_WAIT_2 state before it is aborted at the local end. While a perfectly valid “receive only” state for an un-orphaned connection, an orphaned connection in FIN_WAIT_2 state could otherwise wait forever for the remote to close its end of the connection.}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj6ubj)}(hCf. tcp_max_orphansh]hCf. tcp_max_orphans}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj6ubj)}(hDefault: 60 secondsh]hDefault: 60 seconds}(hjUhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj6ubeh}(h]h ]h"]h$]h&]uh1hhj$ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_frto - INTEGER Enables Forward RTO-Recovery (F-RTO) defined in RFC5682. F-RTO is an enhanced recovery algorithm for TCP retransmission timeouts. It is particularly beneficial in networks where the RTT fluctuates (e.g., wireless). F-RTO is sender-side only modification. It does not require any support from the peer. By default it's enabled with a non-zero value. 0 disables F-RTO. h](h)}(htcp_frto - INTEGERh]htcp_frto - INTEGER}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjoubh)}(hhh](j)}(hX.Enables Forward RTO-Recovery (F-RTO) defined in RFC5682. F-RTO is an enhanced recovery algorithm for TCP retransmission timeouts. It is particularly beneficial in networks where the RTT fluctuates (e.g., wireless). F-RTO is sender-side only modification. It does not require any support from the peer.h]hX.Enables Forward RTO-Recovery (F-RTO) defined in RFC5682. F-RTO is an enhanced recovery algorithm for TCP retransmission timeouts. It is particularly beneficial in networks where the RTT fluctuates (e.g., wireless). F-RTO is sender-side only modification. It does not require any support from the peer.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h@By default it's enabled with a non-zero value. 0 disables F-RTO.h]hBBy default it’s enabled with a non-zero value. 0 disables F-RTO.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjoubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_fwmark_accept - BOOLEAN If set, incoming connections to listening sockets that do not have a socket mark will set the mark of the accepting socket to the fwmark of the incoming SYN packet. This will cause all packets on that connection (starting from the first SYNACK) to be sent with that fwmark. The listening socket's mark is unchanged. Listening sockets that already have a fwmark set via setsockopt(SOL_SOCKET, SO_MARK, ...) are unaffected. Default: 0 h](h)}(htcp_fwmark_accept - BOOLEANh]htcp_fwmark_accept - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hXIf set, incoming connections to listening sockets that do not have a socket mark will set the mark of the accepting socket to the fwmark of the incoming SYN packet. This will cause all packets on that connection (starting from the first SYNACK) to be sent with that fwmark. The listening socket's mark is unchanged. Listening sockets that already have a fwmark set via setsockopt(SOL_SOCKET, SO_MARK, ...) are unaffected.h]hXIf set, incoming connections to listening sockets that do not have a socket mark will set the mark of the accepting socket to the fwmark of the incoming SYN packet. This will cause all packets on that connection (starting from the first SYNACK) to be sent with that fwmark. The listening socket’s mark is unchanged. Listening sockets that already have a fwmark set via setsockopt(SOL_SOCKET, SO_MARK, ...) are unaffected.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h Default: 0h]h Default: 0}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_invalid_ratelimit - INTEGER Limit the maximal rate for sending duplicate acknowledgments in response to incoming TCP packets that are for an existing connection but that are invalid due to any of these reasons: (a) out-of-window sequence number, (b) out-of-window acknowledgment number, or (c) PAWS (Protection Against Wrapped Sequence numbers) check failure This can help mitigate simple "ack loop" DoS attacks, wherein a buggy or malicious middlebox or man-in-the-middle can rewrite TCP header fields in manner that causes each endpoint to think that the other is sending invalid TCP segments, thus causing each side to send an unterminating stream of duplicate acknowledgments for invalid segments. Using 0 disables rate-limiting of dupacks in response to invalid segments; otherwise this value specifies the minimal space between sending such dupacks, in milliseconds. Default: 500 (milliseconds). h](h)}(htcp_invalid_ratelimit - INTEGERh]htcp_invalid_ratelimit - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hLimit the maximal rate for sending duplicate acknowledgments in response to incoming TCP packets that are for an existing connection but that are invalid due to any of these reasons:h]hLimit the maximal rate for sending duplicate acknowledgments in response to incoming TCP packets that are for an existing connection but that are invalid due to any of these reasons:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj )}(h(a) out-of-window sequence number, (b) out-of-window acknowledgment number, or (c) PAWS (Protection Against Wrapped Sequence numbers) check failure h]henumerated_list)}(hhh](j)}(hout-of-window sequence number,h]j)}(hjh]hout-of-window sequence number,}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubj)}(h'out-of-window acknowledgment number, orh]j)}(hj.h]h'out-of-window acknowledgment number, or}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj,ubah}(h]h ]h"]h$]h&]uh1hhjubj)}(hAPAWS (Protection Against Wrapped Sequence numbers) check failure h]j)}(h@PAWS (Protection Against Wrapped Sequence numbers) check failureh]h@PAWS (Protection Against Wrapped Sequence numbers) check failure}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjCubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]enumtype loweralphaprefix(suffix)uh1jhj ubah}(h]h ]h"]h$]h&]uh1j hhhMhjubj)}(hXVThis can help mitigate simple "ack loop" DoS attacks, wherein a buggy or malicious middlebox or man-in-the-middle can rewrite TCP header fields in manner that causes each endpoint to think that the other is sending invalid TCP segments, thus causing each side to send an unterminating stream of duplicate acknowledgments for invalid segments.h]hXZThis can help mitigate simple “ack loop” DoS attacks, wherein a buggy or malicious middlebox or man-in-the-middle can rewrite TCP header fields in manner that causes each endpoint to think that the other is sending invalid TCP segments, thus causing each side to send an unterminating stream of duplicate acknowledgments for invalid segments.}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hUsing 0 disables rate-limiting of dupacks in response to invalid segments; otherwise this value specifies the minimal space between sending such dupacks, in milliseconds.h]hUsing 0 disables rate-limiting of dupacks in response to invalid segments; otherwise this value specifies the minimal space between sending such dupacks, in milliseconds.}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hDefault: 500 (milliseconds).h]hDefault: 500 (milliseconds).}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(httcp_keepalive_time - INTEGER How often TCP sends out keepalive messages when keepalive is enabled. Default: 2hours. h](h)}(htcp_keepalive_time - INTEGERh]htcp_keepalive_time - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh]j)}(hVHow often TCP sends out keepalive messages when keepalive is enabled. Default: 2hours.h]hVHow often TCP sends out keepalive messages when keepalive is enabled. Default: 2hours.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(htcp_keepalive_probes - INTEGER How many keepalive probes TCP sends out, until it decides that the connection is broken. Default value: 9. h](h)}(htcp_keepalive_probes - INTEGERh]htcp_keepalive_probes - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh]j)}(hjHow many keepalive probes TCP sends out, until it decides that the connection is broken. Default value: 9.h]hjHow many keepalive probes TCP sends out, until it decides that the connection is broken. Default value: 9.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_keepalive_intvl - INTEGER How frequently the probes are send out. Multiplied by tcp_keepalive_probes it is time to kill not responding connection, after probes started. Default value: 75sec i.e. connection will be aborted after ~11 minutes of retries. h](h)}(htcp_keepalive_intvl - INTEGERh]htcp_keepalive_intvl - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjubh)}(hhh]j)}(hHow frequently the probes are send out. Multiplied by tcp_keepalive_probes it is time to kill not responding connection, after probes started. Default value: 75sec i.e. connection will be aborted after ~11 minutes of retries.h]hHow frequently the probes are send out. Multiplied by tcp_keepalive_probes it is time to kill not responding connection, after probes started. Default value: 75sec i.e. connection will be aborted after ~11 minutes of retries.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhM hj> hhubh)}(hXtcp_l3mdev_accept - BOOLEAN Enables child sockets to inherit the L3 master device index. Enabling this option allows a "global" listen socket to work across L3 master domains (e.g., VRFs) with connected sockets derived from the listen socket to be bound to the L3 domain in which the packets originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV. Default: 0 (disabled) h](h)}(htcp_l3mdev_accept - BOOLEANh]htcp_l3mdev_accept - BOOLEAN}(hj4hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj0ubh)}(hhh](j)}(hXZEnables child sockets to inherit the L3 master device index. Enabling this option allows a "global" listen socket to work across L3 master domains (e.g., VRFs) with connected sockets derived from the listen socket to be bound to the L3 domain in which the packets originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV.h]hX^Enables child sockets to inherit the L3 master device index. Enabling this option allows a “global” listen socket to work across L3 master domains (e.g., VRFs) with connected sockets derived from the listen socket to be bound to the L3 domain in which the packets originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV.}(hjEhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjBubj)}(hDefault: 0 (disabled)h]hDefault: 0 (disabled)}(hjShhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjBubeh}(h]h ]h"]h$]h&]uh1hhj0ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hMtcp_low_latency - BOOLEAN This is a legacy option, it has no effect anymore. h](h)}(htcp_low_latency - BOOLEANh]htcp_low_latency - BOOLEAN}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjmubh)}(hhh]j)}(h2This is a legacy option, it has no effect anymore.h]h2This is a legacy option, it has no effect anymore.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjmubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXStcp_max_orphans - INTEGER Maximal number of TCP sockets not attached to any user file handle, held by system. If this number is exceeded orphaned connections are reset immediately and warning is printed. This limit exists only to prevent simple DoS attacks, you _must_ not rely on this or lower the limit artificially, but rather increase it (probably, after increasing installed memory), if network conditions require more than default value, and tune network services to linger and kill such states more aggressively. Let me to remind again: each orphan eats up to ~64K of unswappable memory. h](h)}(htcp_max_orphans - INTEGERh]htcp_max_orphans - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM"hjubh)}(hhh]j)}(hX8Maximal number of TCP sockets not attached to any user file handle, held by system. If this number is exceeded orphaned connections are reset immediately and warning is printed. This limit exists only to prevent simple DoS attacks, you _must_ not rely on this or lower the limit artificially, but rather increase it (probably, after increasing installed memory), if network conditions require more than default value, and tune network services to linger and kill such states more aggressively. Let me to remind again: each orphan eats up to ~64K of unswappable memory.h]hX8Maximal number of TCP sockets not attached to any user file handle, held by system. If this number is exceeded orphaned connections are reset immediately and warning is printed. This limit exists only to prevent simple DoS attacks, you _must_ not rely on this or lower the limit artificially, but rather increase it (probably, after increasing installed memory), if network conditions require more than default value, and tune network services to linger and kill such states more aggressively. Let me to remind again: each orphan eats up to ~64K of unswappable memory.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhM"hj> hhubh)}(hXtcp_max_syn_backlog - INTEGER Maximal number of remembered connection requests (SYN_RECV), which have not received an acknowledgment from connecting client. This is a per-listener limit. The minimal value is 128 for low memory machines, and it will increase in proportion to the memory of machine. If server suffers from overload, try increasing this number. Remember to also check /proc/sys/net/core/somaxconn A SYN_RECV request socket consumes about 304 bytes of memory. h](h)}(htcp_max_syn_backlog - INTEGERh]htcp_max_syn_backlog - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM0hjubh)}(hhh](j)}(h~Maximal number of remembered connection requests (SYN_RECV), which have not received an acknowledgment from connecting client.h]h~Maximal number of remembered connection requests (SYN_RECV), which have not received an acknowledgment from connecting client.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM%hjubj)}(hThis is a per-listener limit.h]hThis is a per-listener limit.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM(hjubj)}(hnThe minimal value is 128 for low memory machines, and it will increase in proportion to the memory of machine.h]hnThe minimal value is 128 for low memory machines, and it will increase in proportion to the memory of machine.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM*hjubj)}(h hhubh)}(hXtcp_max_tw_buckets - INTEGER Maximal number of timewait sockets held by system simultaneously. If this number is exceeded time-wait socket is immediately destroyed and warning is printed. This limit exists only to prevent simple DoS attacks, you _must_ not lower the limit artificially, but rather increase it (probably, after increasing installed memory), if network conditions require more than default value. h](h)}(htcp_max_tw_buckets - INTEGERh]htcp_max_tw_buckets - INTEGER}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM8hj2ubh)}(hhh]j)}(hX~Maximal number of timewait sockets held by system simultaneously. If this number is exceeded time-wait socket is immediately destroyed and warning is printed. This limit exists only to prevent simple DoS attacks, you _must_ not lower the limit artificially, but rather increase it (probably, after increasing installed memory), if network conditions require more than default value.h]hX~Maximal number of timewait sockets held by system simultaneously. If this number is exceeded time-wait socket is immediately destroyed and warning is printed. This limit exists only to prevent simple DoS attacks, you _must_ not lower the limit artificially, but rather increase it (probably, after increasing installed memory), if network conditions require more than default value.}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM3hjDubah}(h]h ]h"]h$]h&]uh1hhj2ubeh}(h]h ]h"]h$]h&]uh1hhhhM8hj> hhubh)}(hXtcp_mem - vector of 3 INTEGERs: min, pressure, max min: below this number of pages TCP is not bothered about its memory appetite. pressure: when amount of memory allocated by TCP exceeds this number of pages, TCP moderates its memory consumption and enters memory pressure mode, which is exited when memory consumption falls under "min". max: number of pages allowed for queueing by all TCP sockets. Defaults are calculated at boot time from amount of available memory. h](h)}(h2tcp_mem - vector of 3 INTEGERs: min, pressure, maxh]h2tcp_mem - vector of 3 INTEGERs: min, pressure, max}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMFhjaubh)}(hhh](j)}(hNmin: below this number of pages TCP is not bothered about its memory appetite.h]hNmin: below this number of pages TCP is not bothered about its memory appetite.}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM;hjsubj)}(hpressure: when amount of memory allocated by TCP exceeds this number of pages, TCP moderates its memory consumption and enters memory pressure mode, which is exited when memory consumption falls under "min".h]hpressure: when amount of memory allocated by TCP exceeds this number of pages, TCP moderates its memory consumption and enters memory pressure mode, which is exited when memory consumption falls under “min”.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM>hjsubj)}(h=max: number of pages allowed for queueing by all TCP sockets.h]h=max: number of pages allowed for queueing by all TCP sockets.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMChjsubj)}(hEDefaults are calculated at boot time from amount of available memory.h]hEDefaults are calculated at boot time from amount of available memory.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMEhjsubeh}(h]h ]h"]h$]h&]uh1hhjaubeh}(h]h ]h"]h$]h&]uh1hhhhMFhj> hhubh)}(hXtcp_min_rtt_wlen - INTEGER The window length of the windowed min filter to track the minimum RTT. A shorter window lets a flow more quickly pick up new (higher) minimum RTT when it is moved to a longer path (e.g., due to traffic engineering). A longer window makes the filter more resistant to RTT inflations such as transient congestion. The unit is seconds. Possible values: 0 - 86400 (1 day) Default: 300 h](h)}(htcp_min_rtt_wlen - INTEGERh]htcp_min_rtt_wlen - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMQhjubh)}(hhh](j)}(hXLThe window length of the windowed min filter to track the minimum RTT. A shorter window lets a flow more quickly pick up new (higher) minimum RTT when it is moved to a longer path (e.g., due to traffic engineering). A longer window makes the filter more resistant to RTT inflations such as transient congestion. The unit is seconds.h]hXLThe window length of the windowed min filter to track the minimum RTT. A shorter window lets a flow more quickly pick up new (higher) minimum RTT when it is moved to a longer path (e.g., due to traffic engineering). A longer window makes the filter more resistant to RTT inflations such as transient congestion. The unit is seconds.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMIhjubj)}(h"Possible values: 0 - 86400 (1 day)h]h"Possible values: 0 - 86400 (1 day)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMOhjubj)}(h Default: 300h]h Default: 300}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMQhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMQhj> hhubh)}(htcp_moderate_rcvbuf - BOOLEAN If set, TCP performs receive buffer auto-tuning, attempting to automatically size the buffer (no greater than tcp_rmem[2]) to match the size required by the path for full throughput. Enabled by default. h](h)}(htcp_moderate_rcvbuf - BOOLEANh]htcp_moderate_rcvbuf - BOOLEAN}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMWhjubh)}(hhh]j)}(hIf set, TCP performs receive buffer auto-tuning, attempting to automatically size the buffer (no greater than tcp_rmem[2]) to match the size required by the path for full throughput. Enabled by default.h]hIf set, TCP performs receive buffer auto-tuning, attempting to automatically size the buffer (no greater than tcp_rmem[2]) to match the size required by the path for full throughput. Enabled by default.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMThjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMWhj> hhubh)}(htcp_mtu_probing - INTEGER Controls TCP Packetization-Layer Path MTU Discovery. Takes three values: - 0 - Disabled - 1 - Disabled by default, enabled when an ICMP black hole detected - 2 - Always enabled, use initial MSS of tcp_base_mss. h](h)}(htcp_mtu_probing - INTEGERh]htcp_mtu_probing - INTEGER}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM_hj4ubh)}(hhh](j)}(hIControls TCP Packetization-Layer Path MTU Discovery. Takes three values:h]hIControls TCP Packetization-Layer Path MTU Discovery. Takes three values:}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMZhjFubh)}(hhh](j)}(h 0 - Disabledh]j)}(hj\h]h 0 - Disabled}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM]hjZubah}(h]h ]h"]h$]h&]uh1hhjWubj)}(hA1 - Disabled by default, enabled when an ICMP black hole detectedh]j)}(hjsh]hA1 - Disabled by default, enabled when an ICMP black hole detected}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM^hjqubah}(h]h ]h"]h$]h&]uh1hhjWubj)}(h52 - Always enabled, use initial MSS of tcp_base_mss. h]j)}(h42 - Always enabled, use initial MSS of tcp_base_mss.h]h42 - Always enabled, use initial MSS of tcp_base_mss.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM_hjubah}(h]h ]h"]h$]h&]uh1hhjWubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM]hjFubeh}(h]h ]h"]h$]h&]uh1hhj4ubeh}(h]h ]h"]h$]h&]uh1hhhhM_hj> hhubh)}(htcp_probe_interval - UNSIGNED INTEGER Controls how often to start TCP Packetization-Layer Path MTU Discovery reprobe. The default is reprobing every 10 minutes as per RFC4821. h](h)}(h%tcp_probe_interval - UNSIGNED INTEGERh]h%tcp_probe_interval - UNSIGNED INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMdhjubh)}(hhh]j)}(hControls how often to start TCP Packetization-Layer Path MTU Discovery reprobe. The default is reprobing every 10 minutes as per RFC4821.h]hControls how often to start TCP Packetization-Layer Path MTU Discovery reprobe. The default is reprobing every 10 minutes as per RFC4821.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMbhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMdhj> hhubh)}(htcp_probe_threshold - INTEGER Controls when TCP Packetization-Layer Path MTU Discovery probing will stop in respect to the width of search range in bytes. Default is 8 bytes. h](h)}(htcp_probe_threshold - INTEGERh]htcp_probe_threshold - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMihjubh)}(hhh]j)}(hControls when TCP Packetization-Layer Path MTU Discovery probing will stop in respect to the width of search range in bytes. Default is 8 bytes.h]hControls when TCP Packetization-Layer Path MTU Discovery probing will stop in respect to the width of search range in bytes. Default is 8 bytes.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMghjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMihj> hhubh)}(hXutcp_no_metrics_save - BOOLEAN By default, TCP saves various connection metrics in the route cache when the connection closes, so that connections established in the near future can use these to set initial conditions. Usually, this increases overall performance, but may sometimes cause performance degradation. If set, TCP will not cache metrics on closing connections. h](h)}(htcp_no_metrics_save - BOOLEANh]htcp_no_metrics_save - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMqhjubh)}(hhh]j)}(hXVBy default, TCP saves various connection metrics in the route cache when the connection closes, so that connections established in the near future can use these to set initial conditions. Usually, this increases overall performance, but may sometimes cause performance degradation. If set, TCP will not cache metrics on closing connections.h]hXVBy default, TCP saves various connection metrics in the route cache when the connection closes, so that connections established in the near future can use these to set initial conditions. Usually, this increases overall performance, but may sometimes cause performance degradation. If set, TCP will not cache metrics on closing connections.}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMlhj"ubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMqhj> hhubh)}(htcp_no_ssthresh_metrics_save - BOOLEAN Controls whether TCP saves ssthresh metrics in the route cache. Default is 1, which disables ssthresh metrics. h](h)}(h&tcp_no_ssthresh_metrics_save - BOOLEANh]h&tcp_no_ssthresh_metrics_save - BOOLEAN}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMvhj?ubh)}(hhh](j)}(h?Controls whether TCP saves ssthresh metrics in the route cache.h]h?Controls whether TCP saves ssthresh metrics in the route cache.}(hjThhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMthjQubj)}(h.Default is 1, which disables ssthresh metrics.h]h.Default is 1, which disables ssthresh metrics.}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMvhjQubeh}(h]h ]h"]h$]h&]uh1hhj?ubeh}(h]h ]h"]h$]h&]uh1hhhhMvhj> hhubh)}(hXitcp_orphan_retries - INTEGER This value influences the timeout of a locally closed TCP connection, when RTO retransmissions remain unacknowledged. See tcp_retries2 for more details. The default value is 8. If your machine is a loaded WEB server, you should think about lowering this value, such sockets may consume significant resources. Cf. tcp_max_orphans. h](h)}(htcp_orphan_retries - INTEGERh]htcp_orphan_retries - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj|ubh)}(hhh](j)}(hThis value influences the timeout of a locally closed TCP connection, when RTO retransmissions remain unacknowledged. See tcp_retries2 for more details.h]hThis value influences the timeout of a locally closed TCP connection, when RTO retransmissions remain unacknowledged. See tcp_retries2 for more details.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMyhjubj)}(hThe default value is 8.h]hThe default value is 8.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM}hjubj)}(hIf your machine is a loaded WEB server, you should think about lowering this value, such sockets may consume significant resources. Cf. tcp_max_orphans.h]hIf your machine is a loaded WEB server, you should think about lowering this value, such sockets may consume significant resources. Cf. tcp_max_orphans.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhj|ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXDtcp_recovery - INTEGER This value is a bitmap to enable various experimental loss recovery features. ========= ============================================================= RACK: 0x1 enables the RACK loss detection for fast detection of lost retransmissions and tail drops. It also subsumes and disables RFC6675 recovery for SACK connections. RACK: 0x2 makes RACK's reordering window static (min_rtt/4). RACK: 0x4 disables RACK's DUPACK threshold heuristic ========= ============================================================= Default: 0x1 h](h)}(htcp_recovery - INTEGERh]htcp_recovery - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hMThis value is a bitmap to enable various experimental loss recovery features.h]hMThis value is a bitmap to enable various experimental loss recovery features.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj[)}(hhh]j`)}(hhh](je)}(hhh]h}(h]h ]h"]h$]h&]colwidthK uh1jdhjubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthK=uh1jdhjubj{)}(hhh](j)}(hhh](j)}(hhh]j)}(h RACK: 0x1h]h RACK: 0x1}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj ubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(henables the RACK loss detection for fast detection of lost retransmissions and tail drops. It also subsumes and disables RFC6675 recovery for SACK connections.h]henables the RACK loss detection for fast detection of lost retransmissions and tail drops. It also subsumes and disables RFC6675 recovery for SACK connections.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj!ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]j)}(h RACK: 0x2h]h RACK: 0x2}(hjDhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjAubah}(h]h ]h"]h$]h&]uh1jhj>ubj)}(hhh]j)}(h2makes RACK's reordering window static (min_rtt/4).h]h4makes RACK’s reordering window static (min_rtt/4).}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjXubah}(h]h ]h"]h$]h&]uh1jhj>ubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]j)}(h RACK: 0x4h]h RACK: 0x4}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjxubah}(h]h ]h"]h$]h&]uh1jhjuubj)}(hhh]j)}(h*disables RACK's DUPACK threshold heuristich]h,disables RACK’s DUPACK threshold heuristic}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjuubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jzhjubeh}(h]h ]h"]h$]h&]colsKuh1j_hjubah}(h]h ]h"]h$]h&]uh1jZhjubj)}(h Default: 0x1h]h Default: 0x1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXLtcp_reflect_tos - BOOLEAN For listening sockets, reuse the DSCP value of the initial SYN message for outgoing packets. This allows to have both directions of a TCP stream to use the same DSCP value, assuming DSCP remains unchanged for the lifetime of the connection. This options affects both IPv4 and IPv6. Default: 0 (disabled) h](h)}(htcp_reflect_tos - BOOLEANh]htcp_reflect_tos - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hFor listening sockets, reuse the DSCP value of the initial SYN message for outgoing packets. This allows to have both directions of a TCP stream to use the same DSCP value, assuming DSCP remains unchanged for the lifetime of the connection.h]hFor listening sockets, reuse the DSCP value of the initial SYN message for outgoing packets. This allows to have both directions of a TCP stream to use the same DSCP value, assuming DSCP remains unchanged for the lifetime of the connection.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h(This options affects both IPv4 and IPv6.h]h(This options affects both IPv4 and IPv6.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hDefault: 0 (disabled)h]hDefault: 0 (disabled)}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(htcp_reordering - INTEGER Initial reordering level of packets in a TCP stream. TCP stack can then dynamically adjust flow reordering level between this initial value and tcp_max_reordering Default: 3 h](h)}(htcp_reordering - INTEGERh]htcp_reordering - INTEGER}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj$ubh)}(hhh](j)}(hInitial reordering level of packets in a TCP stream. TCP stack can then dynamically adjust flow reordering level between this initial value and tcp_max_reorderingh]hInitial reordering level of packets in a TCP stream. TCP stack can then dynamically adjust flow reordering level between this initial value and tcp_max_reordering}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj6ubj)}(h Default: 3h]h Default: 3}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj6ubeh}(h]h ]h"]h$]h&]uh1hhj$ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(htcp_max_reordering - INTEGER Maximal reordering level of packets in a TCP stream. 300 is a fairly conservative value, but you might increase it if paths are using per packet load balancing (like bonding rr mode) Default: 300 h](h)}(htcp_max_reordering - INTEGERh]htcp_max_reordering - INTEGER}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjaubh)}(hhh](j)}(hMaximal reordering level of packets in a TCP stream. 300 is a fairly conservative value, but you might increase it if paths are using per packet load balancing (like bonding rr mode)h]hMaximal reordering level of packets in a TCP stream. 300 is a fairly conservative value, but you might increase it if paths are using per packet load balancing (like bonding rr mode)}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjsubj)}(h Default: 300h]h Default: 300}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjsubeh}(h]h ]h"]h$]h&]uh1hhjaubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(htcp_retrans_collapse - BOOLEAN Bug-to-bug compatibility with some broken printers. On retransmit try to send bigger packets to work around bugs in certain TCP stacks. h](h)}(htcp_retrans_collapse - BOOLEANh]htcp_retrans_collapse - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh]j)}(hBug-to-bug compatibility with some broken printers. On retransmit try to send bigger packets to work around bugs in certain TCP stacks.h]hBug-to-bug compatibility with some broken printers. On retransmit try to send bigger packets to work around bugs in certain TCP stacks.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hX.tcp_retries1 - INTEGER This value influences the time, after which TCP decides, that something is wrong due to unacknowledged RTO retransmissions, and reports this suspicion to the network layer. See tcp_retries2 for more details. RFC 1122 recommends at least 3 retransmissions, which is the default. h](h)}(htcp_retries1 - INTEGERh]htcp_retries1 - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hThis value influences the time, after which TCP decides, that something is wrong due to unacknowledged RTO retransmissions, and reports this suspicion to the network layer. See tcp_retries2 for more details.h]hThis value influences the time, after which TCP decides, that something is wrong due to unacknowledged RTO retransmissions, and reports this suspicion to the network layer. See tcp_retries2 for more details.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hERFC 1122 recommends at least 3 retransmissions, which is the default.h]hERFC 1122 recommends at least 3 retransmissions, which is the default.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_retries2 - INTEGER This value influences the timeout of an alive TCP connection, when RTO retransmissions remain unacknowledged. Given a value of N, a hypothetical TCP connection following exponential backoff with an initial RTO of TCP_RTO_MIN would retransmit N times before killing the connection at the (N+1)th RTO. The default value of 15 yields a hypothetical timeout of 924.6 seconds and is a lower bound for the effective timeout. TCP will effectively time out at the first RTO which exceeds the hypothetical timeout. If tcp_rto_max_ms is decreased, it is recommended to also change tcp_retries2. RFC 1122 recommends at least 100 seconds for the timeout, which corresponds to a value of at least 8. h](h)}(htcp_retries2 - INTEGERh]htcp_retries2 - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubh)}(hhh](j)}(hX+This value influences the timeout of an alive TCP connection, when RTO retransmissions remain unacknowledged. Given a value of N, a hypothetical TCP connection following exponential backoff with an initial RTO of TCP_RTO_MIN would retransmit N times before killing the connection at the (N+1)th RTO.h]hX+This value influences the timeout of an alive TCP connection, when RTO retransmissions remain unacknowledged. Given a value of N, a hypothetical TCP connection following exponential backoff with an initial RTO of TCP_RTO_MIN would retransmit N times before killing the connection at the (N+1)th RTO.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hXThe default value of 15 yields a hypothetical timeout of 924.6 seconds and is a lower bound for the effective timeout. TCP will effectively time out at the first RTO which exceeds the hypothetical timeout. If tcp_rto_max_ms is decreased, it is recommended to also change tcp_retries2.h]hXThe default value of 15 yields a hypothetical timeout of 924.6 seconds and is a lower bound for the effective timeout. TCP will effectively time out at the first RTO which exceeds the hypothetical timeout. If tcp_rto_max_ms is decreased, it is recommended to also change tcp_retries2.}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(heRFC 1122 recommends at least 100 seconds for the timeout, which corresponds to a value of at least 8.h]heRFC 1122 recommends at least 100 seconds for the timeout, which corresponds to a value of at least 8.}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhj ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(htcp_rfc1337 - BOOLEAN If set, the TCP stack behaves conforming to RFC1337. If unset, we are not conforming to RFC, but prevent TCP TIME_WAIT assassination. Default: 0 h](h)}(htcp_rfc1337 - BOOLEANh]htcp_rfc1337 - BOOLEAN}(hjYhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjUubh)}(hhh](j)}(hIf set, the TCP stack behaves conforming to RFC1337. If unset, we are not conforming to RFC, but prevent TCP TIME_WAIT assassination.h]hIf set, the TCP stack behaves conforming to RFC1337. If unset, we are not conforming to RFC, but prevent TCP TIME_WAIT assassination.}(hjjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjgubj)}(h Default: 0h]h Default: 0}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjgubeh}(h]h ]h"]h$]h&]uh1hhjUubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_rmem - vector of 3 INTEGERs: min, default, max min: Minimal size of receive buffer used by TCP sockets. It is guaranteed to each TCP socket, even under moderate memory pressure. Default: 4K default: initial size of receive buffer used by TCP sockets. This value overrides net.core.rmem_default used by other protocols. Default: 131072 bytes. This value results in initial window of 65535. max: maximal size of receive buffer allowed for automatically selected receiver buffers for TCP socket. This value does not override net.core.rmem_max. Calling setsockopt() with SO_RCVBUF disables automatic tuning of that socket's receive buffer size, in which case this value is ignored. Default: between 131072 and 6MB, depending on RAM size. h](h)}(h2tcp_rmem - vector of 3 INTEGERs: min, default, maxh]h2tcp_rmem - vector of 3 INTEGERs: min, default, max}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hmin: Minimal size of receive buffer used by TCP sockets. It is guaranteed to each TCP socket, even under moderate memory pressure.h]hmin: Minimal size of receive buffer used by TCP sockets. It is guaranteed to each TCP socket, even under moderate memory pressure.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h Default: 4Kh]h Default: 4K}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hdefault: initial size of receive buffer used by TCP sockets. This value overrides net.core.rmem_default used by other protocols. Default: 131072 bytes. This value results in initial window of 65535.h]hdefault: initial size of receive buffer used by TCP sockets. This value overrides net.core.rmem_default used by other protocols. Default: 131072 bytes. This value results in initial window of 65535.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hXYmax: maximal size of receive buffer allowed for automatically selected receiver buffers for TCP socket. This value does not override net.core.rmem_max. Calling setsockopt() with SO_RCVBUF disables automatic tuning of that socket's receive buffer size, in which case this value is ignored. Default: between 131072 and 6MB, depending on RAM size.h]hX[max: maximal size of receive buffer allowed for automatically selected receiver buffers for TCP socket. This value does not override net.core.rmem_max. Calling setsockopt() with SO_RCVBUF disables automatic tuning of that socket’s receive buffer size, in which case this value is ignored. Default: between 131072 and 6MB, depending on RAM size.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(h:tcp_sack - BOOLEAN Enable select acknowledgments (SACKS). h](h)}(htcp_sack - BOOLEANh]htcp_sack - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh]j)}(h&Enable select acknowledgments (SACKS).h]h&Enable select acknowledgments (SACKS).}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(htcp_comp_sack_delay_ns - LONG INTEGER TCP tries to reduce number of SACK sent, using a timer based on 5% of SRTT, capped by this sysctl, in nano seconds. The default is 1ms, based on TSO autosizing period. Default : 1,000,000 ns (1 ms) h](h)}(h%tcp_comp_sack_delay_ns - LONG INTEGERh]h%tcp_comp_sack_delay_ns - LONG INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hTCP tries to reduce number of SACK sent, using a timer based on 5% of SRTT, capped by this sysctl, in nano seconds. The default is 1ms, based on TSO autosizing period.h]hTCP tries to reduce number of SACK sent, using a timer based on 5% of SRTT, capped by this sysctl, in nano seconds. The default is 1ms, based on TSO autosizing period.}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj,ubj)}(hDefault : 1,000,000 ns (1 ms)h]hDefault : 1,000,000 ns (1 ms)}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj,ubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_comp_sack_slack_ns - LONG INTEGER This sysctl control the slack used when arming the timer used by SACK compression. This gives extra time for small RTT flows, and reduces system overhead by allowing opportunistic reduction of timer interrupts. Default : 100,000 ns (100 us) h](h)}(h%tcp_comp_sack_slack_ns - LONG INTEGERh]h%tcp_comp_sack_slack_ns - LONG INTEGER}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjWubh)}(hhh](j)}(hThis sysctl control the slack used when arming the timer used by SACK compression. This gives extra time for small RTT flows, and reduces system overhead by allowing opportunistic reduction of timer interrupts.h]hThis sysctl control the slack used when arming the timer used by SACK compression. This gives extra time for small RTT flows, and reduces system overhead by allowing opportunistic reduction of timer interrupts.}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjiubj)}(hDefault : 100,000 ns (100 us)h]hDefault : 100,000 ns (100 us)}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjiubeh}(h]h ]h"]h$]h&]uh1hhjWubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hwtcp_comp_sack_nr - INTEGER Max number of SACK that can be compressed. Using 0 disables SACK compression. Default : 44 h](h)}(htcp_comp_sack_nr - INTEGERh]htcp_comp_sack_nr - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hMMax number of SACK that can be compressed. Using 0 disables SACK compression.h]hMMax number of SACK that can be compressed. Using 0 disables SACK compression.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(h Default : 44h]h Default : 44}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(htcp_backlog_ack_defer - BOOLEAN If set, user thread processing socket backlog tries sending one ACK for the whole queue. This helps to avoid potential long latencies at end of a TCP socket syscall. Default : true h](h)}(htcp_backlog_ack_defer - BOOLEANh]htcp_backlog_ack_defer - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hIf set, user thread processing socket backlog tries sending one ACK for the whole queue. This helps to avoid potential long latencies at end of a TCP socket syscall.h]hIf set, user thread processing socket backlog tries sending one ACK for the whole queue. This helps to avoid potential long latencies at end of a TCP socket syscall.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hDefault : trueh]hDefault : true}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_slow_start_after_idle - BOOLEAN If set, provide RFC2861 behavior and time out the congestion window after an idle period. An idle period is defined at the current RTO. If unset, the congestion window will not be timed out after an idle period. Default: 1 h](h)}(h#tcp_slow_start_after_idle - BOOLEANh]h#tcp_slow_start_after_idle - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjubh)}(hhh](j)}(hIf set, provide RFC2861 behavior and time out the congestion window after an idle period. An idle period is defined at the current RTO. If unset, the congestion window will not be timed out after an idle period.h]hIf set, provide RFC2861 behavior and time out the congestion window after an idle period. An idle period is defined at the current RTO. If unset, the congestion window will not be timed out after an idle period.}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj ubj)}(h Default: 1h]h Default: 1}(hj1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj ubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhM hj> hhubh)}(htcp_stdurg - BOOLEAN Use the Host requirements interpretation of the TCP urgent pointer field. Most hosts use the older BSD interpretation, so if you turn this on Linux might not communicate correctly with them. Default: FALSE h](h)}(htcp_stdurg - BOOLEANh]htcp_stdurg - BOOLEAN}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjKubh)}(hhh](j)}(hUse the Host requirements interpretation of the TCP urgent pointer field. Most hosts use the older BSD interpretation, so if you turn this on Linux might not communicate correctly with them.h]hUse the Host requirements interpretation of the TCP urgent pointer field. Most hosts use the older BSD interpretation, so if you turn this on Linux might not communicate correctly with them.}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj]ubj)}(hDefault: FALSEh]hDefault: FALSE}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj]ubeh}(h]h ]h"]h$]h&]uh1hhjKubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hX_tcp_synack_retries - INTEGER Number of times SYNACKs for a passive TCP connection attempt will be retransmitted. Should not be higher than 255. Default value is 5, which corresponds to 31seconds till the last retransmission with the current initial RTO of 1second. With this the final timeout for a passive TCP connection will happen after 63seconds. h](h)}(htcp_synack_retries - INTEGERh]htcp_synack_retries - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh]j)}(hXANumber of times SYNACKs for a passive TCP connection attempt will be retransmitted. Should not be higher than 255. Default value is 5, which corresponds to 31seconds till the last retransmission with the current initial RTO of 1second. With this the final timeout for a passive TCP connection will happen after 63seconds.h]hXANumber of times SYNACKs for a passive TCP connection attempt will be retransmitted. Should not be higher than 255. Default value is 5, which corresponds to 31seconds till the last retransmission with the current initial RTO of 1second. With this the final timeout for a passive TCP connection will happen after 63seconds.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubah}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXStcp_syncookies - INTEGER Only valid when the kernel was compiled with CONFIG_SYN_COOKIES Send out syncookies when the syn backlog queue of a socket overflows. This is to prevent against the common 'SYN flood attack' Default: 1 Note, that syncookies is fallback facility. It MUST NOT be used to help highly loaded servers to stand against legal connection rate. If you see SYN flood warnings in your logs, but investigation shows that they occur because of overload with legal connections, you should tune another parameters until this warning disappear. See: tcp_max_syn_backlog, tcp_synack_retries, tcp_abort_on_overflow. syncookies seriously violate TCP protocol, do not allow to use TCP extensions, can result in serious degradation of some services (f.e. SMTP relaying), visible not by you, but your clients and relays, contacting you. While you see SYN flood warnings in logs not being really flooded, your server is seriously misconfigured. If you want to test which effects syncookies have to your network connections you can set this knob to 2 to enable unconditionally generation of syncookies. h](h)}(htcp_syncookies - INTEGERh]htcp_syncookies - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM0hjubh)}(hhh](j)}(hOnly valid when the kernel was compiled with CONFIG_SYN_COOKIES Send out syncookies when the syn backlog queue of a socket overflows. This is to prevent against the common 'SYN flood attack' Default: 1h]hOnly valid when the kernel was compiled with CONFIG_SYN_COOKIES Send out syncookies when the syn backlog queue of a socket overflows. This is to prevent against the common ‘SYN flood attack’ Default: 1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hXNote, that syncookies is fallback facility. It MUST NOT be used to help highly loaded servers to stand against legal connection rate. If you see SYN flood warnings in your logs, but investigation shows that they occur because of overload with legal connections, you should tune another parameters until this warning disappear. See: tcp_max_syn_backlog, tcp_synack_retries, tcp_abort_on_overflow.h]hXNote, that syncookies is fallback facility. It MUST NOT be used to help highly loaded servers to stand against legal connection rate. If you see SYN flood warnings in your logs, but investigation shows that they occur because of overload with legal connections, you should tune another parameters until this warning disappear. See: tcp_max_syn_backlog, tcp_synack_retries, tcp_abort_on_overflow.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubj)}(hXCsyncookies seriously violate TCP protocol, do not allow to use TCP extensions, can result in serious degradation of some services (f.e. SMTP relaying), visible not by you, but your clients and relays, contacting you. While you see SYN flood warnings in logs not being really flooded, your server is seriously misconfigured.h]hXCsyncookies seriously violate TCP protocol, do not allow to use TCP extensions, can result in serious degradation of some services (f.e. SMTP relaying), visible not by you, but your clients and relays, contacting you. While you see SYN flood warnings in logs not being really flooded, your server is seriously misconfigured.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM'hjubj)}(hIf you want to test which effects syncookies have to your network connections you can set this knob to 2 to enable unconditionally generation of syncookies.h]hIf you want to test which effects syncookies have to your network connections you can set this knob to 2 to enable unconditionally generation of syncookies.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM.hjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhM0hj> hhubh)}(hXXtcp_migrate_req - BOOLEAN The incoming connection is tied to a specific listening socket when the initial SYN packet is received during the three-way handshake. When a listener is closed, in-flight request sockets during the handshake and established sockets in the accept queue are aborted. If the listener has SO_REUSEPORT enabled, other listeners on the same port should have been able to accept such connections. This option makes it possible to migrate such child sockets to another listener after close() or shutdown(). The BPF_SK_REUSEPORT_SELECT_OR_MIGRATE type of eBPF program should usually be used to define the policy to pick an alive listener. Otherwise, the kernel will randomly pick an alive listener only if this option is enabled. Note that migration between listeners with different settings may crash applications. Let's say migration happens from listener A to B, and only B has TCP_SAVE_SYN enabled. B cannot read SYN data from the requests migrated from A. To avoid such a situation, cancel migration by returning SK_DROP in the type of eBPF program, or disable this option. Default: 0 h](h)}(htcp_migrate_req - BOOLEANh]htcp_migrate_req - BOOLEAN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMIhjubh)}(hhh](j)}(hX The incoming connection is tied to a specific listening socket when the initial SYN packet is received during the three-way handshake. When a listener is closed, in-flight request sockets during the handshake and established sockets in the accept queue are aborted.h]hX The incoming connection is tied to a specific listening socket when the initial SYN packet is received during the three-way handshake. When a listener is closed, in-flight request sockets during the handshake and established sockets in the accept queue are aborted.}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM3hj"ubj)}(hIf the listener has SO_REUSEPORT enabled, other listeners on the same port should have been able to accept such connections. This option makes it possible to migrate such child sockets to another listener after close() or shutdown().h]hIf the listener has SO_REUSEPORT enabled, other listeners on the same port should have been able to accept such connections. This option makes it possible to migrate such child sockets to another listener after close() or shutdown().}(hj3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM8hj"ubj)}(hThe BPF_SK_REUSEPORT_SELECT_OR_MIGRATE type of eBPF program should usually be used to define the policy to pick an alive listener. Otherwise, the kernel will randomly pick an alive listener only if this option is enabled.h]hThe BPF_SK_REUSEPORT_SELECT_OR_MIGRATE type of eBPF program should usually be used to define the policy to pick an alive listener. Otherwise, the kernel will randomly pick an alive listener only if this option is enabled.}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM=hj"ubj)}(hX\Note that migration between listeners with different settings may crash applications. Let's say migration happens from listener A to B, and only B has TCP_SAVE_SYN enabled. B cannot read SYN data from the requests migrated from A. To avoid such a situation, cancel migration by returning SK_DROP in the type of eBPF program, or disable this option.h]hX^Note that migration between listeners with different settings may crash applications. Let’s say migration happens from listener A to B, and only B has TCP_SAVE_SYN enabled. B cannot read SYN data from the requests migrated from A. To avoid such a situation, cancel migration by returning SK_DROP in the type of eBPF program, or disable this option.}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMBhj"ubj)}(h Default: 0h]h Default: 0}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMIhj"ubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMIhj> hhubh)}(hXtcp_fastopen - INTEGER Enable TCP Fast Open (RFC7413) to send and accept data in the opening SYN packet. The client support is enabled by flag 0x1 (on by default). The client then must use sendmsg() or sendto() with the MSG_FASTOPEN flag, rather than connect() to send data in SYN. The server support is enabled by flag 0x2 (off by default). Then either enable for all listeners with another flag (0x400) or enable individual listeners via TCP_FASTOPEN socket option with the option value being the length of the syn-data backlog. The values (bitmap) are ===== ======== ====================================================== 0x1 (client) enables sending data in the opening SYN on the client. 0x2 (server) enables the server support, i.e., allowing data in a SYN packet to be accepted and passed to the application before 3-way handshake finishes. 0x4 (client) send data in the opening SYN regardless of cookie availability and without a cookie option. 0x200 (server) accept data-in-SYN w/o any cookie option present. 0x400 (server) enable all listeners to support Fast Open by default without explicit TCP_FASTOPEN socket option. ===== ======== ====================================================== Default: 0x1 Note that additional client or server features are only effective if the basic support (0x1 and 0x2) are enabled respectively. h](h)}(htcp_fastopen - INTEGERh]htcp_fastopen - INTEGER}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMihjwubh)}(hhh](j)}(hQEnable TCP Fast Open (RFC7413) to send and accept data in the opening SYN packet.h]hQEnable TCP Fast Open (RFC7413) to send and accept data in the opening SYN packet.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMLhjubj)}(hThe client support is enabled by flag 0x1 (on by default). The client then must use sendmsg() or sendto() with the MSG_FASTOPEN flag, rather than connect() to send data in SYN.h]hThe client support is enabled by flag 0x1 (on by default). The client then must use sendmsg() or sendto() with the MSG_FASTOPEN flag, rather than connect() to send data in SYN.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMOhjubj)}(hThe server support is enabled by flag 0x2 (off by default). Then either enable for all listeners with another flag (0x400) or enable individual listeners via TCP_FASTOPEN socket option with the option value being the length of the syn-data backlog.h]hThe server support is enabled by flag 0x2 (off by default). Then either enable for all listeners with another flag (0x400) or enable individual listeners via TCP_FASTOPEN socket option with the option value being the length of the syn-data backlog.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMShjubj)}(hThe values (bitmap) areh]hThe values (bitmap) are}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMXhjubj[)}(hhh]j`)}(hhh](je)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthK6uh1jdhjubj{)}(hhh](j)}(hhh](j)}(hhh]j)}(h0x1h]h0x1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM[hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(h(client)h]h(client)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM[hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(h6enables sending data in the opening SYN on the client.h]h6enables sending data in the opening SYN on the client.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM[hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]j)}(h0x2h]h0x2}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM\hj<ubah}(h]h ]h"]h$]h&]uh1jhj9ubj)}(hhh]j)}(h(server)h]h(server)}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM\hjSubah}(h]h ]h"]h$]h&]uh1jhj9ubj)}(hhh]j)}(henables the server support, i.e., allowing data in a SYN packet to be accepted and passed to the application before 3-way handshake finishes.h]henables the server support, i.e., allowing data in a SYN packet to be accepted and passed to the application before 3-way handshake finishes.}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM\hjjubah}(h]h ]h"]h$]h&]uh1jhj9ubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]j)}(h0x4h]h0x4}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM_hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(h(client)h]h(client)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM_hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(h[send data in the opening SYN regardless of cookie availability and without a cookie option.h]h[send data in the opening SYN regardless of cookie availability and without a cookie option.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM_hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]j)}(h0x200h]h0x200}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMahjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(h(server)h]h(server)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMahjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]j)}(h1accept data-in-SYN w/o any cookie option present.h]h1accept data-in-SYN w/o any cookie option present.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMahjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]j)}(h0x400h]h0x400}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMbhj&ubah}(h]h ]h"]h$]h&]uh1jhj#ubj)}(hhh]j)}(h(server)h]h(server)}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMbhj=ubah}(h]h ]h"]h$]h&]uh1jhj#ubj)}(hhh]j)}(haenable all listeners to support Fast Open by default without explicit TCP_FASTOPEN socket option.h]haenable all listeners to support Fast Open by default without explicit TCP_FASTOPEN socket option.}(hjWhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMbhjTubah}(h]h ]h"]h$]h&]uh1jhj#ubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jzhjubeh}(h]h ]h"]h$]h&]colsKuh1j_hjubah}(h]h ]h"]h$]h&]uh1jZhjubj)}(h Default: 0x1h]h Default: 0x1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMfhjubj)}(h~Note that additional client or server features are only effective if the basic support (0x1 and 0x2) are enabled respectively.h]h~Note that additional client or server features are only effective if the basic support (0x1 and 0x2) are enabled respectively.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhhjubeh}(h]h ]h"]h$]h&]uh1hhjwubeh}(h]h ]h"]h$]h&]uh1hhhhMihj> hhubh)}(hXtcp_fastopen_blackhole_timeout_sec - INTEGER Initial time period in second to disable Fastopen on active TCP sockets when a TFO firewall blackhole issue happens. This time period will grow exponentially when more blackhole issues get detected right after Fastopen is re-enabled and will reset to initial value when the blackhole issue goes away. 0 to disable the blackhole detection. By default, it is set to 0 (feature is disabled). h](h)}(h,tcp_fastopen_blackhole_timeout_sec - INTEGERh]h,tcp_fastopen_blackhole_timeout_sec - INTEGER}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMshjubh)}(hhh](j)}(hXRInitial time period in second to disable Fastopen on active TCP sockets when a TFO firewall blackhole issue happens. This time period will grow exponentially when more blackhole issues get detected right after Fastopen is re-enabled and will reset to initial value when the blackhole issue goes away. 0 to disable the blackhole detection.h]hXRInitial time period in second to disable Fastopen on active TCP sockets when a TFO firewall blackhole issue happens. This time period will grow exponentially when more blackhole issues get detected right after Fastopen is re-enabled and will reset to initial value when the blackhole issue goes away. 0 to disable the blackhole detection.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMlhjubj)}(h1By default, it is set to 0 (feature is disabled).h]h1By default, it is set to 0 (feature is disabled).}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMshjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMshj> hhubh)}(hXBtcp_fastopen_key - list of comma separated 32-digit hexadecimal INTEGERs The list consists of a primary key and an optional backup key. The primary key is used for both creating and validating cookies, while the optional backup key is only used for validating cookies. The purpose of the backup key is to maximize TFO validation when keys are rotated. A randomly chosen primary key may be configured by the kernel if the tcp_fastopen sysctl is set to 0x400 (see above), or if the TCP_FASTOPEN setsockopt() optname is set and a key has not been previously configured via sysctl. If keys are configured via setsockopt() by using the TCP_FASTOPEN_KEY optname, then those per-socket keys will be used instead of any keys that are specified via sysctl. A key is specified as 4 8-digit hexadecimal integers which are separated by a '-' as: xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx. Leading zeros may be omitted. A primary and a backup key may be specified by separating them by a comma. If only one key is specified, it becomes the primary key and any previously configured backup keys are removed. h](h)}(hHtcp_fastopen_key - list of comma separated 32-digit hexadecimal INTEGERsh]hHtcp_fastopen_key - list of comma separated 32-digit hexadecimal INTEGERs}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubh)}(hhh](j)}(hXThe list consists of a primary key and an optional backup key. The primary key is used for both creating and validating cookies, while the optional backup key is only used for validating cookies. The purpose of the backup key is to maximize TFO validation when keys are rotated.h]hXThe list consists of a primary key and an optional backup key. The primary key is used for both creating and validating cookies, while the optional backup key is only used for validating cookies. The purpose of the backup key is to maximize TFO validation when keys are rotated.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMvhjubj)}(hXA randomly chosen primary key may be configured by the kernel if the tcp_fastopen sysctl is set to 0x400 (see above), or if the TCP_FASTOPEN setsockopt() optname is set and a key has not been previously configured via sysctl. If keys are configured via setsockopt() by using the TCP_FASTOPEN_KEY optname, then those per-socket keys will be used instead of any keys that are specified via sysctl.h]hXA randomly chosen primary key may be configured by the kernel if the tcp_fastopen sysctl is set to 0x400 (see above), or if the TCP_FASTOPEN setsockopt() optname is set and a key has not been previously configured via sysctl. If keys are configured via setsockopt() by using the TCP_FASTOPEN_KEY optname, then those per-socket keys will be used instead of any keys that are specified via sysctl.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM{hjubj)}(hXSA key is specified as 4 8-digit hexadecimal integers which are separated by a '-' as: xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx. Leading zeros may be omitted. A primary and a backup key may be specified by separating them by a comma. If only one key is specified, it becomes the primary key and any previously configured backup keys are removed.h]hXWA key is specified as 4 8-digit hexadecimal integers which are separated by a ‘-’ as: xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx. Leading zeros may be omitted. A primary and a backup key may be specified by separating them by a comma. If only one key is specified, it becomes the primary key and any previously configured backup keys are removed.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjubeh}(h]h ]h"]h$]h&]uh1hhjubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_syn_retries - INTEGER Number of times initial SYNs for an active TCP connection attempt will be retransmitted. Should not be higher than 127. Default value is 6, which corresponds to 67seconds (with tcp_syn_linear_timeouts = 4) till the last retransmission with the current initial RTO of 1second. With this the final timeout for an active TCP connection attempt will happen after 131seconds. h](h)}(htcp_syn_retries - INTEGERh]htcp_syn_retries - INTEGER}(hj8 hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj4 ubh)}(hhh]j)}(hXrNumber of times initial SYNs for an active TCP connection attempt will be retransmitted. Should not be higher than 127. Default value is 6, which corresponds to 67seconds (with tcp_syn_linear_timeouts = 4) till the last retransmission with the current initial RTO of 1second. With this the final timeout for an active TCP connection attempt will happen after 131seconds.h]hXrNumber of times initial SYNs for an active TCP connection attempt will be retransmitted. Should not be higher than 127. Default value is 6, which corresponds to 67seconds (with tcp_syn_linear_timeouts = 4) till the last retransmission with the current initial RTO of 1second. With this the final timeout for an active TCP connection attempt will happen after 131seconds.}(hjI hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjF ubah}(h]h ]h"]h$]h&]uh1hhj4 ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hX tcp_timestamps - INTEGER Enable timestamps as defined in RFC1323. - 0: Disabled. - 1: Enable timestamps as defined in RFC1323 and use random offset for each connection rather than only using the current time. - 2: Like 1, but without random offsets. Default: 1 h](h)}(htcp_timestamps - INTEGERh]htcp_timestamps - INTEGER}(hjg hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjc ubh)}(hhh](j)}(h(Enable timestamps as defined in RFC1323.h]h(Enable timestamps as defined in RFC1323.}(hjx hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhju ubh)}(hhh](j)}(h 0: Disabled.h]j)}(hj h]h 0: Disabled.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj ubah}(h]h ]h"]h$]h&]uh1hhj ubj)}(h}1: Enable timestamps as defined in RFC1323 and use random offset for each connection rather than only using the current time.h]j)}(h}1: Enable timestamps as defined in RFC1323 and use random offset for each connection rather than only using the current time.h]h}1: Enable timestamps as defined in RFC1323 and use random offset for each connection rather than only using the current time.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj ubah}(h]h ]h"]h$]h&]uh1hhj ubj)}(h'2: Like 1, but without random offsets. h]j)}(h&2: Like 1, but without random offsets.h]h&2: Like 1, but without random offsets.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj ubah}(h]h ]h"]h$]h&]uh1hhj ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhju ubj)}(h Default: 1h]h Default: 1}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhju ubeh}(h]h ]h"]h$]h&]uh1hhjc ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXltcp_min_tso_segs - INTEGER Minimal number of segments per TSO frame. Since linux-3.12, TCP does an automatic sizing of TSO frames, depending on flow rate, instead of filling 64Kbytes packets. For specific usages, it's possible to force TCP to build big TSO frames. Note that TCP stack might split too big TSO packets if available window is too small. Default: 2 h](h)}(htcp_min_tso_segs - INTEGERh]htcp_min_tso_segs - INTEGER}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubh)}(hhh](j)}(h)Minimal number of segments per TSO frame.h]h)Minimal number of segments per TSO frame.}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj!ubj)}(hXSince linux-3.12, TCP does an automatic sizing of TSO frames, depending on flow rate, instead of filling 64Kbytes packets. For specific usages, it's possible to force TCP to build big TSO frames. Note that TCP stack might split too big TSO packets if available window is too small.h]hXSince linux-3.12, TCP does an automatic sizing of TSO frames, depending on flow rate, instead of filling 64Kbytes packets. For specific usages, it’s possible to force TCP to build big TSO frames. Note that TCP stack might split too big TSO packets if available window is too small.}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj!ubj)}(h Default: 2h]h Default: 2}(hj!!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj!ubeh}(h]h ]h"]h$]h&]uh1hhj ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXttcp_tso_rtt_log - INTEGER Adjustment of TSO packet sizes based on min_rtt Starting from linux-5.18, TCP autosizing can be tweaked for flows having small RTT. Old autosizing was splitting the pacing budget to send 1024 TSO per second. tso_packet_size = sk->sk_pacing_rate / 1024; With the new mechanism, we increase this TSO sizing using: distance = min_rtt_usec / (2^tcp_tso_rtt_log) tso_packet_size += gso_max_size >> distance; This means that flows between very close hosts can use bigger TSO packets, reducing their cpu costs. If you want to use the old autosizing, set this sysctl to 0. Default: 9 (2^9 = 512 usec) h](h)}(htcp_tso_rtt_log - INTEGERh]htcp_tso_rtt_log - INTEGER}(hj?!hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj;!ubh)}(hhh](j)}(h/Adjustment of TSO packet sizes based on min_rtth]h/Adjustment of TSO packet sizes based on min_rtt}(hjP!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjM!ubj)}(hSStarting from linux-5.18, TCP autosizing can be tweaked for flows having small RTT.h]hSStarting from linux-5.18, TCP autosizing can be tweaked for flows having small RTT.}(hj^!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjM!ubj)}(hKOld autosizing was splitting the pacing budget to send 1024 TSO per second.h]hKOld autosizing was splitting the pacing budget to send 1024 TSO per second.}(hjl!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjM!ubj)}(h,tso_packet_size = sk->sk_pacing_rate / 1024;h]h,tso_packet_size = sk->sk_pacing_rate / 1024;}(hjz!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjM!ubj)}(h:With the new mechanism, we increase this TSO sizing using:h]h:With the new mechanism, we increase this TSO sizing using:}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjM!ubj)}(hZdistance = min_rtt_usec / (2^tcp_tso_rtt_log) tso_packet_size += gso_max_size >> distance;h]hZdistance = min_rtt_usec / (2^tcp_tso_rtt_log) tso_packet_size += gso_max_size >> distance;}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjM!ubj)}(hdThis means that flows between very close hosts can use bigger TSO packets, reducing their cpu costs.h]hdThis means that flows between very close hosts can use bigger TSO packets, reducing their cpu costs.}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjM!ubj)}(h hhubh)}(hX'tcp_pacing_ss_ratio - INTEGER sk->sk_pacing_rate is set by TCP stack using a ratio applied to current rate. (current_rate = cwnd * mss / srtt) If TCP is in slow start, tcp_pacing_ss_ratio is applied to let TCP probe for bigger speeds, assuming cwnd can be doubled every other RTT. Default: 200 h](h)}(htcp_pacing_ss_ratio - INTEGERh]htcp_pacing_ss_ratio - INTEGER}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj!ubh)}(hhh](j)}(hsk->sk_pacing_rate is set by TCP stack using a ratio applied to current rate. (current_rate = cwnd * mss / srtt) If TCP is in slow start, tcp_pacing_ss_ratio is applied to let TCP probe for bigger speeds, assuming cwnd can be doubled every other RTT.h]hsk->sk_pacing_rate is set by TCP stack using a ratio applied to current rate. (current_rate = cwnd * mss / srtt) If TCP is in slow start, tcp_pacing_ss_ratio is applied to let TCP probe for bigger speeds, assuming cwnd can be doubled every other RTT.}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj!ubj)}(h Default: 200h]h Default: 200}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj!ubeh}(h]h ]h"]h$]h&]uh1hhj!ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_pacing_ca_ratio - INTEGER sk->sk_pacing_rate is set by TCP stack using a ratio applied to current rate. (current_rate = cwnd * mss / srtt) If TCP is in congestion avoidance phase, tcp_pacing_ca_ratio is applied to conservatively probe for bigger throughput. Default: 120 h](h)}(htcp_pacing_ca_ratio - INTEGERh]htcp_pacing_ca_ratio - INTEGER}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj"ubh)}(hhh](j)}(hsk->sk_pacing_rate is set by TCP stack using a ratio applied to current rate. (current_rate = cwnd * mss / srtt) If TCP is in congestion avoidance phase, tcp_pacing_ca_ratio is applied to conservatively probe for bigger throughput.h]hsk->sk_pacing_rate is set by TCP stack using a ratio applied to current rate. (current_rate = cwnd * mss / srtt) If TCP is in congestion avoidance phase, tcp_pacing_ca_ratio is applied to conservatively probe for bigger throughput.}(hj,"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj)"ubj)}(h Default: 120h]h Default: 120}(hj:"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj)"ubeh}(h]h ]h"]h$]h&]uh1hhj"ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_syn_linear_timeouts - INTEGER The number of times for an active TCP connection to retransmit SYNs with a linear backoff timeout before defaulting to an exponential backoff timeout. This has no effect on SYNACK at the passive TCP side. With an initial RTO of 1 and tcp_syn_linear_timeouts = 4 we would expect SYN RTOs to be: 1, 1, 1, 1, 1, 2, 4, ... (4 linear timeouts, and the first exponential backoff using 2^0 * initial_RTO). Default: 4 h](h)}(h!tcp_syn_linear_timeouts - INTEGERh]h!tcp_syn_linear_timeouts - INTEGER}(hjX"hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjT"ubh)}(hhh](j)}(hThe number of times for an active TCP connection to retransmit SYNs with a linear backoff timeout before defaulting to an exponential backoff timeout. This has no effect on SYNACK at the passive TCP side.h]hThe number of times for an active TCP connection to retransmit SYNs with a linear backoff timeout before defaulting to an exponential backoff timeout. This has no effect on SYNACK at the passive TCP side.}(hji"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjf"ubj)}(hWith an initial RTO of 1 and tcp_syn_linear_timeouts = 4 we would expect SYN RTOs to be: 1, 1, 1, 1, 1, 2, 4, ... (4 linear timeouts, and the first exponential backoff using 2^0 * initial_RTO). Default: 4h]hWith an initial RTO of 1 and tcp_syn_linear_timeouts = 4 we would expect SYN RTOs to be: 1, 1, 1, 1, 1, 2, 4, ... (4 linear timeouts, and the first exponential backoff using 2^0 * initial_RTO). Default: 4}(hjw"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjf"ubeh}(h]h ]h"]h$]h&]uh1hhjT"ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(htcp_tso_win_divisor - INTEGER This allows control over what percentage of the congestion window can be consumed by a single TSO frame. The setting of this parameter is a choice between burstiness and building larger TSO frames. Default: 3 h](h)}(htcp_tso_win_divisor - INTEGERh]htcp_tso_win_divisor - INTEGER}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj"ubh)}(hhh](j)}(hThis allows control over what percentage of the congestion window can be consumed by a single TSO frame. The setting of this parameter is a choice between burstiness and building larger TSO frames.h]hThis allows control over what percentage of the congestion window can be consumed by a single TSO frame. The setting of this parameter is a choice between burstiness and building larger TSO frames.}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj"ubj)}(h Default: 3h]h Default: 3}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj"ubeh}(h]h ]h"]h$]h&]uh1hhj"ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_tw_reuse - INTEGER Enable reuse of TIME-WAIT sockets for new connections when it is safe from protocol viewpoint. - 0 - disable - 1 - global enable - 2 - enable for loopback traffic only It should not be changed without advice/request of technical experts. Default: 2 h](h)}(htcp_tw_reuse - INTEGERh]htcp_tw_reuse - INTEGER}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj"ubh)}(hhh](j)}(h^Enable reuse of TIME-WAIT sockets for new connections when it is safe from protocol viewpoint.h]h^Enable reuse of TIME-WAIT sockets for new connections when it is safe from protocol viewpoint.}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj"ubh)}(hhh](j)}(h 0 - disableh]j)}(hj"h]h 0 - disable}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj"ubah}(h]h ]h"]h$]h&]uh1hhj"ubj)}(h1 - global enableh]j)}(hj #h]h1 - global enable}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj #ubah}(h]h ]h"]h$]h&]uh1hhj"ubj)}(h%2 - enable for loopback traffic only h]j)}(h$2 - enable for loopback traffic onlyh]h$2 - enable for loopback traffic only}(hj&#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj"#ubah}(h]h ]h"]h$]h&]uh1hhj"ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhj"ubj)}(hEIt should not be changed without advice/request of technical experts.h]hEIt should not be changed without advice/request of technical experts.}(hj@#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj"ubj)}(h Default: 2h]h Default: 2}(hjN#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj"ubeh}(h]h ]h"]h$]h&]uh1hhj"ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXstcp_tw_reuse_delay - UNSIGNED INTEGER The delay in milliseconds before a TIME-WAIT socket can be reused by a new connection, if TIME-WAIT socket reuse is enabled. The actual reuse threshold is within [N, N+1] range, where N is the requested delay in milliseconds, to ensure the delay interval is never shorter than the configured value. This setting contains an assumption about the other TCP timestamp clock tick interval. It should not be set to a value lower than the peer's clock tick for PAWS (Protection Against Wrapped Sequence numbers) mechanism work correctly for the reused connection. Default: 1000 (milliseconds) h](h)}(h%tcp_tw_reuse_delay - UNSIGNED INTEGERh]h%tcp_tw_reuse_delay - UNSIGNED INTEGER}(hjl#hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjh#ubh)}(hhh](j)}(hX*The delay in milliseconds before a TIME-WAIT socket can be reused by a new connection, if TIME-WAIT socket reuse is enabled. The actual reuse threshold is within [N, N+1] range, where N is the requested delay in milliseconds, to ensure the delay interval is never shorter than the configured value.h]hX*The delay in milliseconds before a TIME-WAIT socket can be reused by a new connection, if TIME-WAIT socket reuse is enabled. The actual reuse threshold is within [N, N+1] range, where N is the requested delay in milliseconds, to ensure the delay interval is never shorter than the configured value.}(hj}#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjz#ubj)}(hXThis setting contains an assumption about the other TCP timestamp clock tick interval. It should not be set to a value lower than the peer's clock tick for PAWS (Protection Against Wrapped Sequence numbers) mechanism work correctly for the reused connection.h]hXThis setting contains an assumption about the other TCP timestamp clock tick interval. It should not be set to a value lower than the peer’s clock tick for PAWS (Protection Against Wrapped Sequence numbers) mechanism work correctly for the reused connection.}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjz#ubj)}(hDefault: 1000 (milliseconds)h]hDefault: 1000 (milliseconds)}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjz#ubeh}(h]h ]h"]h$]h&]uh1hhjh#ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hJtcp_window_scaling - BOOLEAN Enable window scaling as defined in RFC1323. h](h)}(htcp_window_scaling - BOOLEANh]htcp_window_scaling - BOOLEAN}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj#ubh)}(hhh]j)}(h,Enable window scaling as defined in RFC1323.h]h,Enable window scaling as defined in RFC1323.}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj#ubah}(h]h ]h"]h$]h&]uh1hhj#ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXBtcp_shrink_window - BOOLEAN This changes how the TCP receive window is calculated. RFC 7323, section 2.4, says there are instances when a retracted window can be offered, and that TCP implementations MUST ensure that they handle a shrinking window, as specified in RFC 1122. - 0 - Disabled. The window is never shrunk. - 1 - Enabled. The window is shrunk when necessary to remain within the memory limit set by autotuning (sk_rcvbuf). This only occurs if a non-zero receive window scaling factor is also in effect. Default: 0 h](h)}(htcp_shrink_window - BOOLEANh]htcp_shrink_window - BOOLEAN}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj#ubh)}(hhh](j)}(h6This changes how the TCP receive window is calculated.h]h6This changes how the TCP receive window is calculated.}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj#ubj)}(hRFC 7323, section 2.4, says there are instances when a retracted window can be offered, and that TCP implementations MUST ensure that they handle a shrinking window, as specified in RFC 1122.h]hRFC 7323, section 2.4, says there are instances when a retracted window can be offered, and that TCP implementations MUST ensure that they handle a shrinking window, as specified in RFC 1122.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj#ubh)}(hhh](j)}(h)0 - Disabled. The window is never shrunk.h]j)}(hj$h]h)0 - Disabled. The window is never shrunk.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj$ubah}(h]h ]h"]h$]h&]uh1hhj$ubj)}(h1 - Enabled. The window is shrunk when necessary to remain within the memory limit set by autotuning (sk_rcvbuf). This only occurs if a non-zero receive window scaling factor is also in effect. h]h)}(hhh]h)}(h1 - Enabled. The window is shrunk when necessary to remain within the memory limit set by autotuning (sk_rcvbuf). This only occurs if a non-zero receive window scaling factor is also in effect. h](h)}(hB1 - Enabled. The window is shrunk when necessary to remain withinh]hB1 - Enabled. The window is shrunk when necessary to remain within}(hj8$hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj4$ubh)}(hhh]j)}(hthe memory limit set by autotuning (sk_rcvbuf). This only occurs if a non-zero receive window scaling factor is also in effect.h]hthe memory limit set by autotuning (sk_rcvbuf). This only occurs if a non-zero receive window scaling factor is also in effect.}(hjI$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjF$ubah}(h]h ]h"]h$]h&]uh1hhj4$ubeh}(h]h ]h"]h$]h&]uh1hhhhM hj1$ubah}(h]h ]h"]h$]h&]uh1hhj-$ubah}(h]h ]h"]h$]h&]uh1hhj$ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhj#ubj)}(h Default: 0h]h Default: 0}(hju$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj#ubeh}(h]h ]h"]h$]h&]uh1hhj#ubeh}(h]h ]h"]h$]h&]uh1hhhhM hj> hhubh)}(hXtcp_wmem - vector of 3 INTEGERs: min, default, max min: Amount of memory reserved for send buffers for TCP sockets. Each TCP socket has rights to use it due to fact of its birth. Default: 4K default: initial size of send buffer used by TCP sockets. This value overrides net.core.wmem_default used by other protocols. It is usually lower than net.core.wmem_default. Default: 16K max: Maximal amount of memory allowed for automatically tuned send buffers for TCP sockets. This value does not override net.core.wmem_max. Calling setsockopt() with SO_SNDBUF disables automatic tuning of that socket's send buffer size, in which case this value is ignored. Default: between 64K and 4MB, depending on RAM size. h](h)}(h2tcp_wmem - vector of 3 INTEGERs: min, default, maxh]h2tcp_wmem - vector of 3 INTEGERs: min, default, max}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj$ubh)}(hhh](j)}(hmin: Amount of memory reserved for send buffers for TCP sockets. Each TCP socket has rights to use it due to fact of its birth.h]hmin: Amount of memory reserved for send buffers for TCP sockets. Each TCP socket has rights to use it due to fact of its birth.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj$ubj)}(h Default: 4Kh]h Default: 4K}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj$ubj)}(h~default: initial size of send buffer used by TCP sockets. This value overrides net.core.wmem_default used by other protocols.h]h~default: initial size of send buffer used by TCP sockets. This value overrides net.core.wmem_default used by other protocols.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj$ubj)}(h/It is usually lower than net.core.wmem_default.h]h/It is usually lower than net.core.wmem_default.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj$ubj)}(h Default: 16Kh]h Default: 16K}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj$ubj)}(hXmax: Maximal amount of memory allowed for automatically tuned send buffers for TCP sockets. This value does not override net.core.wmem_max. Calling setsockopt() with SO_SNDBUF disables automatic tuning of that socket's send buffer size, in which case this value is ignored.h]hXmax: Maximal amount of memory allowed for automatically tuned send buffers for TCP sockets. This value does not override net.core.wmem_max. Calling setsockopt() with SO_SNDBUF disables automatic tuning of that socket’s send buffer size, in which case this value is ignored.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj$ubj)}(h4Default: between 64K and 4MB, depending on RAM size.h]h4Default: between 64K and 4MB, depending on RAM size.}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj$ubeh}(h]h ]h"]h$]h&]uh1hhj$ubeh}(h]h ]h"]h$]h&]uh1hhhhM hj> hhubh)}(hX.tcp_notsent_lowat - UNSIGNED INTEGER A TCP socket can control the amount of unsent bytes in its write queue, thanks to TCP_NOTSENT_LOWAT socket option. poll()/select()/epoll() reports POLLOUT events if the amount of unsent bytes is below a per socket value, and if the write queue is not full. sendmsg() will also not add new buffers if the limit is hit. This global variable controls the amount of unsent data for sockets not using TCP_NOTSENT_LOWAT. For these sockets, a change to the global variable has immediate effect. Default: UINT_MAX (0xFFFFFFFF) h](h)}(h$tcp_notsent_lowat - UNSIGNED INTEGERh]h$tcp_notsent_lowat - UNSIGNED INTEGER}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM-hj%ubh)}(hhh](j)}(hX=A TCP socket can control the amount of unsent bytes in its write queue, thanks to TCP_NOTSENT_LOWAT socket option. poll()/select()/epoll() reports POLLOUT events if the amount of unsent bytes is below a per socket value, and if the write queue is not full. sendmsg() will also not add new buffers if the limit is hit.h]hX=A TCP socket can control the amount of unsent bytes in its write queue, thanks to TCP_NOTSENT_LOWAT socket option. poll()/select()/epoll() reports POLLOUT events if the amount of unsent bytes is below a per socket value, and if the write queue is not full. sendmsg() will also not add new buffers if the limit is hit.}(hj'%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM#hj$%ubj)}(hThis global variable controls the amount of unsent data for sockets not using TCP_NOTSENT_LOWAT. For these sockets, a change to the global variable has immediate effect.h]hThis global variable controls the amount of unsent data for sockets not using TCP_NOTSENT_LOWAT. For these sockets, a change to the global variable has immediate effect.}(hj5%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM)hj$%ubj)}(hDefault: UINT_MAX (0xFFFFFFFF)h]hDefault: UINT_MAX (0xFFFFFFFF)}(hjC%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM-hj$%ubeh}(h]h ]h"]h$]h&]uh1hhj%ubeh}(h]h ]h"]h$]h&]uh1hhhhM-hj> hhubh)}(hXtcp_workaround_signed_windows - BOOLEAN If set, assume no receipt of a window scaling option means the remote TCP is broken and treats the window as a signed quantity. If unset, assume the remote TCP is not broken even if we do not receive a window scaling option from them. Default: 0 h](h)}(h'tcp_workaround_signed_windows - BOOLEANh]h'tcp_workaround_signed_windows - BOOLEAN}(hja%hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM5hj]%ubh)}(hhh](j)}(hIf set, assume no receipt of a window scaling option means the remote TCP is broken and treats the window as a signed quantity. If unset, assume the remote TCP is not broken even if we do not receive a window scaling option from them.h]hIf set, assume no receipt of a window scaling option means the remote TCP is broken and treats the window as a signed quantity. If unset, assume the remote TCP is not broken even if we do not receive a window scaling option from them.}(hjr%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM0hjo%ubj)}(h Default: 0h]h Default: 0}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM5hjo%ubeh}(h]h ]h"]h$]h&]uh1hhj]%ubeh}(h]h ]h"]h$]h&]uh1hhhhM5hj> hhubh)}(hX(tcp_thin_linear_timeouts - BOOLEAN Enable dynamic triggering of linear timeouts for thin streams. If set, a check is performed upon retransmission by timeout to determine if the stream is thin (less than 4 packets in flight). As long as the stream is found to be thin, up to 6 linear timeouts may be performed before exponential backoff mode is initiated. This improves retransmission latency for non-aggressive thin streams, often found to be time-dependent. For more information on thin streams, see Documentation/networking/tcp-thin.rst Default: 0 h](h)}(h"tcp_thin_linear_timeouts - BOOLEANh]h"tcp_thin_linear_timeouts - BOOLEAN}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMBhj%ubh)}(hhh](j)}(hXEnable dynamic triggering of linear timeouts for thin streams. If set, a check is performed upon retransmission by timeout to determine if the stream is thin (less than 4 packets in flight). As long as the stream is found to be thin, up to 6 linear timeouts may be performed before exponential backoff mode is initiated. This improves retransmission latency for non-aggressive thin streams, often found to be time-dependent. For more information on thin streams, see Documentation/networking/tcp-thin.rsth]hXEnable dynamic triggering of linear timeouts for thin streams. If set, a check is performed upon retransmission by timeout to determine if the stream is thin (less than 4 packets in flight). As long as the stream is found to be thin, up to 6 linear timeouts may be performed before exponential backoff mode is initiated. This improves retransmission latency for non-aggressive thin streams, often found to be time-dependent. For more information on thin streams, see Documentation/networking/tcp-thin.rst}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM8hj%ubj)}(h Default: 0h]h Default: 0}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMBhj%ubeh}(h]h ]h"]h$]h&]uh1hhj%ubeh}(h]h ]h"]h$]h&]uh1hhhhMBhj> hhubh)}(hX tcp_limit_output_bytes - INTEGER Controls TCP Small Queue limit per tcp socket. TCP bulk sender tends to increase packets in flight until it gets losses notifications. With SNDBUF autotuning, this can result in a large amount of packets queued on the local machine (e.g.: qdiscs, CPU backlog, or device) hurting latency of other flows, for typical pfifo_fast qdiscs. tcp_limit_output_bytes limits the number of bytes on qdisc or device to reduce artificial RTT/cwnd and reduce bufferbloat. Default: 1048576 (16 * 65536) h](h)}(h tcp_limit_output_bytes - INTEGERh]h tcp_limit_output_bytes - INTEGER}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMNhj%ubh)}(hhh](j)}(hXControls TCP Small Queue limit per tcp socket. TCP bulk sender tends to increase packets in flight until it gets losses notifications. With SNDBUF autotuning, this can result in a large amount of packets queued on the local machine (e.g.: qdiscs, CPU backlog, or device) hurting latency of other flows, for typical pfifo_fast qdiscs. tcp_limit_output_bytes limits the number of bytes on qdisc or device to reduce artificial RTT/cwnd and reduce bufferbloat.h]hXControls TCP Small Queue limit per tcp socket. TCP bulk sender tends to increase packets in flight until it gets losses notifications. With SNDBUF autotuning, this can result in a large amount of packets queued on the local machine (e.g.: qdiscs, CPU backlog, or device) hurting latency of other flows, for typical pfifo_fast qdiscs. tcp_limit_output_bytes limits the number of bytes on qdisc or device to reduce artificial RTT/cwnd and reduce bufferbloat.}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMEhj%ubj)}(hDefault: 1048576 (16 * 65536)h]hDefault: 1048576 (16 * 65536)}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMNhj%ubeh}(h]h ]h"]h$]h&]uh1hhj%ubeh}(h]h ]h"]h$]h&]uh1hhhhMNhj> hhubh)}(hXatcp_challenge_ack_limit - INTEGER Limits number of Challenge ACK sent per second, as recommended in RFC 5961 (Improving TCP's Robustness to Blind In-Window Attacks) Note that this per netns rate limit can allow some side channel attacks and probably should not be enabled. TCP stack implements per TCP socket limits anyway. Default: INT_MAX (unlimited) h](h)}(h!tcp_challenge_ack_limit - INTEGERh]h!tcp_challenge_ack_limit - INTEGER}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMVhj&ubh)}(hhh]j)}(hX>Limits number of Challenge ACK sent per second, as recommended in RFC 5961 (Improving TCP's Robustness to Blind In-Window Attacks) Note that this per netns rate limit can allow some side channel attacks and probably should not be enabled. TCP stack implements per TCP socket limits anyway. Default: INT_MAX (unlimited)h]hX@Limits number of Challenge ACK sent per second, as recommended in RFC 5961 (Improving TCP’s Robustness to Blind In-Window Attacks) Note that this per netns rate limit can allow some side channel attacks and probably should not be enabled. TCP stack implements per TCP socket limits anyway. Default: INT_MAX (unlimited)}(hj)&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMQhj&&ubah}(h]h ]h"]h$]h&]uh1hhj&ubeh}(h]h ]h"]h$]h&]uh1hhhhMVhj> hhubh)}(htcp_ehash_entries - INTEGER Show the number of hash buckets for TCP sockets in the current networking namespace. A negative value means the networking namespace does not own its hash buckets and shares the initial networking namespace's one. h](h)}(htcp_ehash_entries - INTEGERh]htcp_ehash_entries - INTEGER}(hjG&hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM]hjC&ubh)}(hhh](j)}(hTShow the number of hash buckets for TCP sockets in the current networking namespace.h]hTShow the number of hash buckets for TCP sockets in the current networking namespace.}(hjX&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMYhjU&ubj)}(hA negative value means the networking namespace does not own its hash buckets and shares the initial networking namespace's one.h]hA negative value means the networking namespace does not own its hash buckets and shares the initial networking namespace’s one.}(hjf&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM\hjU&ubeh}(h]h ]h"]h$]h&]uh1hhjC&ubeh}(h]h ]h"]h$]h&]uh1hhhhM]hj> hhubh)}(hX`tcp_child_ehash_entries - INTEGER Control the number of hash buckets for TCP sockets in the child networking namespace, which must be set before clone() or unshare(). If the value is not 0, the kernel uses a value rounded up to 2^n as the actual hash bucket size. 0 is a special value, meaning the child networking namespace will share the initial networking namespace's hash buckets. Note that the child will use the global one in case the kernel fails to allocate enough memory. In addition, the global hash buckets are spread over available NUMA nodes, but the allocation of the child hash table depends on the current process's NUMA policy, which could result in performance differences. Note also that the default value of tcp_max_tw_buckets and tcp_max_syn_backlog depend on the hash bucket size. Possible values: 0, 2^n (n: 0 - 24 (16Mi)) Default: 0 h](h)}(h!tcp_child_ehash_entries - INTEGERh]h!tcp_child_ehash_entries - INTEGER}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMshj&ubh)}(hhh](j)}(hControl the number of hash buckets for TCP sockets in the child networking namespace, which must be set before clone() or unshare().h]hControl the number of hash buckets for TCP sockets in the child networking namespace, which must be set before clone() or unshare().}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM`hj&ubj)}(hIf the value is not 0, the kernel uses a value rounded up to 2^n as the actual hash bucket size. 0 is a special value, meaning the child networking namespace will share the initial networking namespace's hash buckets.h]hIf the value is not 0, the kernel uses a value rounded up to 2^n as the actual hash bucket size. 0 is a special value, meaning the child networking namespace will share the initial networking namespace’s hash buckets.}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMchj&ubj)}(hX3Note that the child will use the global one in case the kernel fails to allocate enough memory. In addition, the global hash buckets are spread over available NUMA nodes, but the allocation of the child hash table depends on the current process's NUMA policy, which could result in performance differences.h]hX5Note that the child will use the global one in case the kernel fails to allocate enough memory. In addition, the global hash buckets are spread over available NUMA nodes, but the allocation of the child hash table depends on the current process’s NUMA policy, which could result in performance differences.}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhhj&ubj)}(hnNote also that the default value of tcp_max_tw_buckets and tcp_max_syn_backlog depend on the hash bucket size.h]hnNote also that the default value of tcp_max_tw_buckets and tcp_max_syn_backlog depend on the hash bucket size.}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMnhj&ubj)}(h*Possible values: 0, 2^n (n: 0 - 24 (16Mi))h]h*Possible values: 0, 2^n (n: 0 - 24 (16Mi))}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMqhj&ubj)}(h Default: 0h]h Default: 0}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMshj&ubeh}(h]h ]h"]h$]h&]uh1hhj&ubeh}(h]h ]h"]h$]h&]uh1hhhhMshj> hhubh)}(hXStcp_plb_enabled - BOOLEAN If set and the underlying congestion control (e.g. DCTCP) supports and enables PLB feature, TCP PLB (Protective Load Balancing) is enabled. PLB is described in the following paper: https://doi.org/10.1145/3544216.3544226. Based on PLB parameters, upon sensing sustained congestion, TCP triggers a change in flow label field for outgoing IPv6 packets. A change in flow label field potentially changes the path of outgoing packets for switches that use ECMP/WCMP for routing. PLB changes socket txhash which results in a change in IPv6 Flow Label field, and currently no-op for IPv4 headers. It is possible to apply PLB for IPv4 with other network header fields (e.g. TCP or IPv4 options) or using encapsulation where outer header is used by switches to determine next hop. In either case, further host and switch side changes will be needed. When set, PLB assumes that congestion signal (e.g. ECN) is made available and used by congestion control module to estimate a congestion measure (e.g. ce_ratio). PLB needs a congestion measure to make repathing decisions. Default: FALSE h](h)}(htcp_plb_enabled - BOOLEANh]htcp_plb_enabled - BOOLEAN}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj&ubh)}(hhh](j)}(hXIf set and the underlying congestion control (e.g. DCTCP) supports and enables PLB feature, TCP PLB (Protective Load Balancing) is enabled. PLB is described in the following paper: https://doi.org/10.1145/3544216.3544226. Based on PLB parameters, upon sensing sustained congestion, TCP triggers a change in flow label field for outgoing IPv6 packets. A change in flow label field potentially changes the path of outgoing packets for switches that use ECMP/WCMP for routing.dh](hIf set and the underlying congestion control (e.g. DCTCP) supports and enables PLB feature, TCP PLB (Protective Load Balancing) is enabled. PLB is described in the following paper: }(hj 'hhhNhNubh reference)}(h'https://doi.org/10.1145/3544216.3544226h]h'https://doi.org/10.1145/3544216.3544226}(hj'hhhNhNubah}(h]h ]h"]h$]h&]refurij'uh1j'hj 'ubh. Based on PLB parameters, upon sensing sustained congestion, TCP triggers a change in flow label field for outgoing IPv6 packets. A change in flow label field potentially changes the path of outgoing packets for switches that use ECMP/WCMP for routing.}(hj 'hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMvhj'ubj)}(hXnPLB changes socket txhash which results in a change in IPv6 Flow Label field, and currently no-op for IPv4 headers. It is possible to apply PLB for IPv4 with other network header fields (e.g. TCP or IPv4 options) or using encapsulation where outer header is used by switches to determine next hop. In either case, further host and switch side changes will be needed.h]hXnPLB changes socket txhash which results in a change in IPv6 Flow Label field, and currently no-op for IPv4 headers. It is possible to apply PLB for IPv4 with other network header fields (e.g. TCP or IPv4 options) or using encapsulation where outer header is used by switches to determine next hop. In either case, further host and switch side changes will be needed.}(hj-'hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj'ubj)}(hWhen set, PLB assumes that congestion signal (e.g. ECN) is made available and used by congestion control module to estimate a congestion measure (e.g. ce_ratio). PLB needs a congestion measure to make repathing decisions.h]hWhen set, PLB assumes that congestion signal (e.g. ECN) is made available and used by congestion control module to estimate a congestion measure (e.g. ce_ratio). PLB needs a congestion measure to make repathing decisions.}(hj;'hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj'ubj)}(hDefault: FALSEh]hDefault: FALSE}(hjI'hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj'ubeh}(h]h ]h"]h$]h&]uh1hhj&ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_plb_idle_rehash_rounds - INTEGER Number of consecutive congested rounds (RTT) seen after which a rehash can be performed, given there are no packets in flight. This is referred to as M in PLB paper: https://doi.org/10.1145/3544216.3544226. Possible Values: 0 - 31 Default: 3 h](h)}(h$tcp_plb_idle_rehash_rounds - INTEGERh]h$tcp_plb_idle_rehash_rounds - INTEGER}(hjg'hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjc'ubh)}(hhh](j)}(hNumber of consecutive congested rounds (RTT) seen after which a rehash can be performed, given there are no packets in flight. This is referred to as M in PLB paper: https://doi.org/10.1145/3544216.3544226.h](hNumber of consecutive congested rounds (RTT) seen after which a rehash can be performed, given there are no packets in flight. This is referred to as M in PLB paper: }(hjx'hhhNhNubj')}(h'https://doi.org/10.1145/3544216.3544226h]h'https://doi.org/10.1145/3544216.3544226}(hj'hhhNhNubah}(h]h ]h"]h$]h&]refurij'uh1j'hjx'ubh.}(hjx'hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhju'ubj)}(hPossible Values: 0 - 31h]hPossible Values: 0 - 31}(hj'hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhju'ubj)}(h Default: 3h]h Default: 3}(hj'hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhju'ubeh}(h]h ]h"]h$]h&]uh1hhjc'ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXVtcp_plb_rehash_rounds - INTEGER Number of consecutive congested rounds (RTT) seen after which a forced rehash can be performed. Be careful when setting this parameter, as a small value increases the risk of retransmissions. This is referred to as N in PLB paper: https://doi.org/10.1145/3544216.3544226. Possible Values: 0 - 31 Default: 12 h](h)}(htcp_plb_rehash_rounds - INTEGERh]htcp_plb_rehash_rounds - INTEGER}(hj'hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj'ubh)}(hhh](j)}(hXNumber of consecutive congested rounds (RTT) seen after which a forced rehash can be performed. Be careful when setting this parameter, as a small value increases the risk of retransmissions. This is referred to as N in PLB paper: https://doi.org/10.1145/3544216.3544226.h](hNumber of consecutive congested rounds (RTT) seen after which a forced rehash can be performed. Be careful when setting this parameter, as a small value increases the risk of retransmissions. This is referred to as N in PLB paper: }(hj'hhhNhNubj')}(h'https://doi.org/10.1145/3544216.3544226h]h'https://doi.org/10.1145/3544216.3544226}(hj'hhhNhNubah}(h]h ]h"]h$]h&]refurij'uh1j'hj'ubh.}(hj'hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhj'ubj)}(hPossible Values: 0 - 31h]hPossible Values: 0 - 31}(hj'hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj'ubj)}(h Default: 12h]h Default: 12}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj'ubeh}(h]h ]h"]h$]h&]uh1hhj'ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_plb_suspend_rto_sec - INTEGER Time, in seconds, to suspend PLB in event of an RTO. In order to avoid having PLB repath onto a connectivity "black hole", after an RTO a TCP connection suspends PLB repathing for a random duration between 1x and 2x of this parameter. Randomness is added to avoid concurrent rehashing of multiple TCP connections. This should be set corresponding to the amount of time it takes to repair a failed link. Possible Values: 0 - 255 Default: 60 h](h)}(h!tcp_plb_suspend_rto_sec - INTEGERh]h!tcp_plb_suspend_rto_sec - INTEGER}(hj#(hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj(ubh)}(hhh](j)}(hXTime, in seconds, to suspend PLB in event of an RTO. In order to avoid having PLB repath onto a connectivity "black hole", after an RTO a TCP connection suspends PLB repathing for a random duration between 1x and 2x of this parameter. Randomness is added to avoid concurrent rehashing of multiple TCP connections. This should be set corresponding to the amount of time it takes to repair a failed link.h]hXTime, in seconds, to suspend PLB in event of an RTO. In order to avoid having PLB repath onto a connectivity “black hole”, after an RTO a TCP connection suspends PLB repathing for a random duration between 1x and 2x of this parameter. Randomness is added to avoid concurrent rehashing of multiple TCP connections. This should be set corresponding to the amount of time it takes to repair a failed link.}(hj4(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj1(ubj)}(hPossible Values: 0 - 255h]hPossible Values: 0 - 255}(hjB(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj1(ubj)}(h Default: 60h]h Default: 60}(hjP(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj1(ubeh}(h]h ]h"]h$]h&]uh1hhj(ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_plb_cong_thresh - INTEGER Fraction of packets marked with congestion over a round (RTT) to tag that round as congested. This is referred to as K in the PLB paper: https://doi.org/10.1145/3544216.3544226. The 0-1 fraction range is mapped to 0-256 range to avoid floating point operations. For example, 128 means that if at least 50% of the packets in a round were marked as congested then the round will be tagged as congested. Setting threshold to 0 means that PLB repaths every RTT regardless of congestion. This is not intended behavior for PLB and should be used only for experimentation purpose. Possible Values: 0 - 256 Default: 128 h](h)}(htcp_plb_cong_thresh - INTEGERh]htcp_plb_cong_thresh - INTEGER}(hjn(hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjj(ubh)}(hhh](j)}(hFraction of packets marked with congestion over a round (RTT) to tag that round as congested. This is referred to as K in the PLB paper: https://doi.org/10.1145/3544216.3544226.h](hFraction of packets marked with congestion over a round (RTT) to tag that round as congested. This is referred to as K in the PLB paper: }(hj(hhhNhNubj')}(h'https://doi.org/10.1145/3544216.3544226h]h'https://doi.org/10.1145/3544216.3544226}(hj(hhhNhNubah}(h]h ]h"]h$]h&]refurij(uh1j'hj(ubh.}(hj(hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMhj|(ubj)}(hThe 0-1 fraction range is mapped to 0-256 range to avoid floating point operations. For example, 128 means that if at least 50% of the packets in a round were marked as congested then the round will be tagged as congested.h]hThe 0-1 fraction range is mapped to 0-256 range to avoid floating point operations. For example, 128 means that if at least 50% of the packets in a round were marked as congested then the round will be tagged as congested.}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj|(ubj)}(hSetting threshold to 0 means that PLB repaths every RTT regardless of congestion. This is not intended behavior for PLB and should be used only for experimentation purpose.h]hSetting threshold to 0 means that PLB repaths every RTT regardless of congestion. This is not intended behavior for PLB and should be used only for experimentation purpose.}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj|(ubj)}(hPossible Values: 0 - 256h]hPossible Values: 0 - 256}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj|(ubj)}(h Default: 128h]h Default: 128}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj|(ubeh}(h]h ]h"]h$]h&]uh1hhjj(ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_pingpong_thresh - INTEGER The number of estimated data replies sent for estimated incoming data requests that must happen before TCP considers that a connection is a "ping-pong" (request-response) connection for which delayed acknowledgments can provide benefits. This threshold is 1 by default, but some applications may need a higher threshold for optimal performance. Possible Values: 1 - 255 Default: 1 h](h)}(htcp_pingpong_thresh - INTEGERh]htcp_pingpong_thresh - INTEGER}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj(ubh)}(hhh](j)}(hThe number of estimated data replies sent for estimated incoming data requests that must happen before TCP considers that a connection is a "ping-pong" (request-response) connection for which delayed acknowledgments can provide benefits.h]hThe number of estimated data replies sent for estimated incoming data requests that must happen before TCP considers that a connection is a “ping-pong” (request-response) connection for which delayed acknowledgments can provide benefits.}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj(ubj)}(hjThis threshold is 1 by default, but some applications may need a higher threshold for optimal performance.h]hjThis threshold is 1 by default, but some applications may need a higher threshold for optimal performance.}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj(ubj)}(hPossible Values: 1 - 255h]hPossible Values: 1 - 255}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj(ubj)}(h Default: 1h]h Default: 1}(hj#)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj(ubeh}(h]h ]h"]h$]h&]uh1hhj(ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_rto_min_us - INTEGER Minimal TCP retransmission timeout (in microseconds). Note that the rto_min route option has the highest precedence for configuring this setting, followed by the TCP_BPF_RTO_MIN and TCP_RTO_MIN_US socket options, followed by this tcp_rto_min_us sysctl. The recommended practice is to use a value less or equal to 200000 microseconds. Possible Values: 1 - INT_MAX Default: 200000 h](h)}(htcp_rto_min_us - INTEGERh]htcp_rto_min_us - INTEGER}(hjA)hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj=)ubh)}(hhh](j)}(hMinimal TCP retransmission timeout (in microseconds). Note that the rto_min route option has the highest precedence for configuring this setting, followed by the TCP_BPF_RTO_MIN and TCP_RTO_MIN_US socket options, followed by this tcp_rto_min_us sysctl.h]hMinimal TCP retransmission timeout (in microseconds). Note that the rto_min route option has the highest precedence for configuring this setting, followed by the TCP_BPF_RTO_MIN and TCP_RTO_MIN_US socket options, followed by this tcp_rto_min_us sysctl.}(hjR)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjO)ubj)}(hPThe recommended practice is to use a value less or equal to 200000 microseconds.h]hPThe recommended practice is to use a value less or equal to 200000 microseconds.}(hj`)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjO)ubj)}(hPossible Values: 1 - INT_MAXh]hPossible Values: 1 - INT_MAX}(hjn)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjO)ubj)}(hDefault: 200000h]hDefault: 200000}(hj|)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjO)ubeh}(h]h ]h"]h$]h&]uh1hhj=)ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubh)}(hXtcp_rto_max_ms - INTEGER Maximal TCP retransmission timeout (in ms). Note that TCP_RTO_MAX_MS socket option has higher precedence. When changing tcp_rto_max_ms, it is important to understand that tcp_retries2 might need a change. Possible Values: 1000 - 120,000 Default: 120,000 h](h)}(htcp_rto_max_ms - INTEGERh]htcp_rto_max_ms - INTEGER}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj)ubh)}(hhh](j)}(hiMaximal TCP retransmission timeout (in ms). Note that TCP_RTO_MAX_MS socket option has higher precedence.h]hiMaximal TCP retransmission timeout (in ms). Note that TCP_RTO_MAX_MS socket option has higher precedence.}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj)ubj)}(hbWhen changing tcp_rto_max_ms, it is important to understand that tcp_retries2 might need a change.h]hbWhen changing tcp_rto_max_ms, it is important to understand that tcp_retries2 might need a change.}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj)ubj)}(hPossible Values: 1000 - 120,000h]hPossible Values: 1000 - 120,000}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj)ubj)}(hDefault: 120,000h]hDefault: 120,000}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj)ubeh}(h]h ]h"]h$]h&]uh1hhj)ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj> hhubeh}(h]h ]h"]h$]h&]uh1hhj- hhhhhNubeh}(h] tcp-variablesah ]h"] tcp variablesah$]h&]uh1hhhhhhhhMBubh)}(hhh](h)}(h UDP variablesh]h UDP variables}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj)hhhhhMubh)}(hhh](h)}(hX9udp_l3mdev_accept - BOOLEAN Enabling this option allows a "global" bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV. Default: 0 (disabled) h](h)}(hudp_l3mdev_accept - BOOLEANh]hudp_l3mdev_accept - BOOLEAN}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj*ubh)}(hhh](j)}(hXEnabling this option allows a "global" bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV.h]hX Enabling this option allows a “global” bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV.}(hj&*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj#*ubj)}(hDefault: 0 (disabled)h]hDefault: 0 (disabled)}(hj4*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj#*ubeh}(h]h ]h"]h$]h&]uh1hhj*ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj*ubh)}(hXoudp_mem - vector of 3 INTEGERs: min, pressure, max Number of pages allowed for queueing by all UDP sockets. min: Number of pages allowed for queueing by all UDP sockets. pressure: This value was introduced to follow format of tcp_mem. max: This value was introduced to follow format of tcp_mem. Default is calculated at boot time from amount of available memory. h](h)}(h2udp_mem - vector of 3 INTEGERs: min, pressure, maxh]h2udp_mem - vector of 3 INTEGERs: min, pressure, max}(hjR*hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjN*ubh)}(hhh](j)}(h8Number of pages allowed for queueing by all UDP sockets.h]h8Number of pages allowed for queueing by all UDP sockets.}(hjc*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj`*ubj)}(h=min: Number of pages allowed for queueing by all UDP sockets.h]h=min: Number of pages allowed for queueing by all UDP sockets.}(hjq*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj`*ubj)}(h@pressure: This value was introduced to follow format of tcp_mem.h]h@pressure: This value was introduced to follow format of tcp_mem.}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj`*ubj)}(h;max: This value was introduced to follow format of tcp_mem.h]h;max: This value was introduced to follow format of tcp_mem.}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj`*ubj)}(hCDefault is calculated at boot time from amount of available memory.h]hCDefault is calculated at boot time from amount of available memory.}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj`*ubeh}(h]h ]h"]h$]h&]uh1hhjN*ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj*hhubh)}(hudp_rmem_min - INTEGER Minimal size of receive buffer used by UDP sockets in moderation. Each UDP socket is able to use the size for receiving data, even if total pages of UDP sockets exceed udp_mem pressure. The unit is byte. Default: 4K h](h)}(hudp_rmem_min - INTEGERh]hudp_rmem_min - INTEGER}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj*ubh)}(hhh](j)}(hMinimal size of receive buffer used by UDP sockets in moderation. Each UDP socket is able to use the size for receiving data, even if total pages of UDP sockets exceed udp_mem pressure. The unit is byte.h]hMinimal size of receive buffer used by UDP sockets in moderation. Each UDP socket is able to use the size for receiving data, even if total pages of UDP sockets exceed udp_mem pressure. The unit is byte.}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj*ubj)}(h Default: 4Kh]h Default: 4K}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj*ubeh}(h]h ]h"]h$]h&]uh1hhj*ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj*hhubh)}(h^udp_wmem_min - INTEGER UDP does not have tx memory accounting and this tunable has no effect. h](h)}(hudp_wmem_min - INTEGERh]hudp_wmem_min - INTEGER}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj*ubh)}(hhh]j)}(hFUDP does not have tx memory accounting and this tunable has no effect.h]hFUDP does not have tx memory accounting and this tunable has no effect.}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj+ubah}(h]h ]h"]h$]h&]uh1hhj*ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj*hhubh)}(hudp_hash_entries - INTEGER Show the number of hash buckets for UDP sockets in the current networking namespace. A negative value means the networking namespace does not own its hash buckets and shares the initial networking namespace's one. h](h)}(hudp_hash_entries - INTEGERh]hudp_hash_entries - INTEGER}(hj%+hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj!+ubh)}(hhh](j)}(hTShow the number of hash buckets for UDP sockets in the current networking namespace.h]hTShow the number of hash buckets for UDP sockets in the current networking namespace.}(hj6+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3+ubj)}(hA negative value means the networking namespace does not own its hash buckets and shares the initial networking namespace's one.h]hA negative value means the networking namespace does not own its hash buckets and shares the initial networking namespace’s one.}(hjD+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj3+ubeh}(h]h ]h"]h$]h&]uh1hhj!+ubeh}(h]h ]h"]h$]h&]uh1hhhhM hj*hhubh)}(hXudp_child_ehash_entries - INTEGER Control the number of hash buckets for UDP sockets in the child networking namespace, which must be set before clone() or unshare(). If the value is not 0, the kernel uses a value rounded up to 2^n as the actual hash bucket size. 0 is a special value, meaning the child networking namespace will share the initial networking namespace's hash buckets. Note that the child will use the global one in case the kernel fails to allocate enough memory. In addition, the global hash buckets are spread over available NUMA nodes, but the allocation of the child hash table depends on the current process's NUMA policy, which could result in performance differences. Possible values: 0, 2^n (n: 7 (128) - 16 (64K)) Default: 0 h](h)}(h!udp_child_ehash_entries - INTEGERh]h!udp_child_ehash_entries - INTEGER}(hjb+hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj^+ubh)}(hhh](j)}(hControl the number of hash buckets for UDP sockets in the child networking namespace, which must be set before clone() or unshare().h]hControl the number of hash buckets for UDP sockets in the child networking namespace, which must be set before clone() or unshare().}(hjs+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjp+ubj)}(hIf the value is not 0, the kernel uses a value rounded up to 2^n as the actual hash bucket size. 0 is a special value, meaning the child networking namespace will share the initial networking namespace's hash buckets.h]hIf the value is not 0, the kernel uses a value rounded up to 2^n as the actual hash bucket size. 0 is a special value, meaning the child networking namespace will share the initial networking namespace’s hash buckets.}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjp+ubj)}(hX3Note that the child will use the global one in case the kernel fails to allocate enough memory. In addition, the global hash buckets are spread over available NUMA nodes, but the allocation of the child hash table depends on the current process's NUMA policy, which could result in performance differences.h]hX5Note that the child will use the global one in case the kernel fails to allocate enough memory. In addition, the global hash buckets are spread over available NUMA nodes, but the allocation of the child hash table depends on the current process’s NUMA policy, which could result in performance differences.}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjp+ubj)}(h/Possible values: 0, 2^n (n: 7 (128) - 16 (64K))h]h/Possible values: 0, 2^n (n: 7 (128) - 16 (64K))}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjp+ubj)}(h Default: 0h]h Default: 0}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjp+ubeh}(h]h ]h"]h$]h&]uh1hhj^+ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj*hhubeh}(h]h ]h"]h$]h&]uh1hhj)hhhhhNubeh}(h] udp-variablesah ]h"] udp variablesah$]h&]uh1hhhhhhhhMubh)}(hhh](h)}(h RAW variablesh]h RAW variables}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj+hhhhhM"ubh)}(hhh]h)}(hX8raw_l3mdev_accept - BOOLEAN Enabling this option allows a "global" bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV. Default: 1 (enabled) h](h)}(hraw_l3mdev_accept - BOOLEANh]hraw_l3mdev_accept - BOOLEAN}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM+hj+ubh)}(hhh](j)}(hXEnabling this option allows a "global" bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV.h]hX Enabling this option allows a “global” bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV.}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM%hj+ubj)}(hDefault: 1 (enabled)h]hDefault: 1 (enabled)}(hj ,hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM+hj+ubeh}(h]h ]h"]h$]h&]uh1hhj+ubeh}(h]h ]h"]h$]h&]uh1hhhhM+hj+ubah}(h]h ]h"]h$]h&]uh1hhj+hhhhhNubeh}(h] raw-variablesah ]h"] raw variablesah$]h&]uh1hhhhhhhhM"ubh)}(hhh](h)}(hCIPSOv4 Variablesh]hCIPSOv4 Variables}(hj5,hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj2,hhhhhM.ubh)}(hhh](h)}(hXbcipso_cache_enable - BOOLEAN If set, enable additions to and lookups from the CIPSO label mapping cache. If unset, additions are ignored and lookups always result in a miss. However, regardless of the setting the cache is still invalidated when required when means you can safely toggle this on and off and the cache will always be "safe". Default: 1 h](h)}(hcipso_cache_enable - BOOLEANh]hcipso_cache_enable - BOOLEAN}(hjJ,hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM7hjF,ubh)}(hhh](j)}(hX8If set, enable additions to and lookups from the CIPSO label mapping cache. If unset, additions are ignored and lookups always result in a miss. However, regardless of the setting the cache is still invalidated when required when means you can safely toggle this on and off and the cache will always be "safe".h]hX<If set, enable additions to and lookups from the CIPSO label mapping cache. If unset, additions are ignored and lookups always result in a miss. However, regardless of the setting the cache is still invalidated when required when means you can safely toggle this on and off and the cache will always be “safe”.}(hj[,hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM1hjX,ubj)}(h Default: 1h]h Default: 1}(hji,hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM7hjX,ubeh}(h]h ]h"]h$]h&]uh1hhjF,ubeh}(h]h ]h"]h$]h&]uh1hhhhM7hjC,ubh)}(hXcipso_cache_bucket_size - INTEGER The CIPSO label cache consists of a fixed size hash table with each hash bucket containing a number of cache entries. This variable limits the number of entries in each hash bucket; the larger the value is, the more CIPSO label mappings that can be cached. When the number of entries in a given hash bucket reaches this limit adding new entries causes the oldest entry in the bucket to be removed to make room. Default: 10 h](h)}(h!cipso_cache_bucket_size - INTEGERh]h!cipso_cache_bucket_size - INTEGER}(hj,hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMAhj,ubh)}(hhh](j)}(hXThe CIPSO label cache consists of a fixed size hash table with each hash bucket containing a number of cache entries. This variable limits the number of entries in each hash bucket; the larger the value is, the more CIPSO label mappings that can be cached. When the number of entries in a given hash bucket reaches this limit adding new entries causes the oldest entry in the bucket to be removed to make room.h]hXThe CIPSO label cache consists of a fixed size hash table with each hash bucket containing a number of cache entries. This variable limits the number of entries in each hash bucket; the larger the value is, the more CIPSO label mappings that can be cached. When the number of entries in a given hash bucket reaches this limit adding new entries causes the oldest entry in the bucket to be removed to make room.}(hj,hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM:hj,ubj)}(h Default: 10h]h Default: 10}(hj,hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMAhj,ubeh}(h]h ]h"]h$]h&]uh1hhj,ubeh}(h]h ]h"]h$]h&]uh1hhhhMAhjC,hhubh)}(hX1cipso_rbm_optfmt - BOOLEAN Enable the "Optimized Tag 1 Format" as defined in section 3.4.2.6 of the CIPSO draft specification (see Documentation/netlabel for details). This means that when set the CIPSO tag will be padded with empty categories in order to make the packet data 32-bit aligned. Default: 0 h](h)}(hcipso_rbm_optfmt - BOOLEANh]hcipso_rbm_optfmt - BOOLEAN}(hj,hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMIhj,ubh)}(hhh](j)}(hX Enable the "Optimized Tag 1 Format" as defined in section 3.4.2.6 of the CIPSO draft specification (see Documentation/netlabel for details). This means that when set the CIPSO tag will be padded with empty categories in order to make the packet data 32-bit aligned.h]hX Enable the “Optimized Tag 1 Format” as defined in section 3.4.2.6 of the CIPSO draft specification (see Documentation/netlabel for details). This means that when set the CIPSO tag will be padded with empty categories in order to make the packet data 32-bit aligned.}(hj,hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMDhj,ubj)}(h Default: 0h]h Default: 0}(hj,hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMIhj,ubeh}(h]h ]h"]h$]h&]uh1hhj,ubeh}(h]h ]h"]h$]h&]uh1hhhhMIhjC,hhubh)}(hXcipso_rbm_structvalid - BOOLEAN If set, do a very strict check of the CIPSO option when ip_options_compile() is called. If unset, relax the checks done during ip_options_compile(). Either way is "safe" as errors are caught else where in the CIPSO processing code but setting this to 0 (False) should result in less work (i.e. it should be faster) but could cause problems with other implementations that require strict checking. Default: 0 h](h)}(hcipso_rbm_structvalid - BOOLEANh]hcipso_rbm_structvalid - BOOLEAN}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMShj,ubh)}(hhh](j)}(hXIf set, do a very strict check of the CIPSO option when ip_options_compile() is called. If unset, relax the checks done during ip_options_compile(). Either way is "safe" as errors are caught else where in the CIPSO processing code but setting this to 0 (False) should result in less work (i.e. it should be faster) but could cause problems with other implementations that require strict checking.h]hXIf set, do a very strict check of the CIPSO option when ip_options_compile() is called. If unset, relax the checks done during ip_options_compile(). Either way is “safe” as errors are caught else where in the CIPSO processing code but setting this to 0 (False) should result in less work (i.e. it should be faster) but could cause problems with other implementations that require strict checking.}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMLhj-ubj)}(h Default: 0h]h Default: 0}(hj -hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMShj-ubeh}(h]h ]h"]h$]h&]uh1hhj,ubeh}(h]h ]h"]h$]h&]uh1hhhhMShjC,hhubeh}(h]h ]h"]h$]h&]uh1hhj2,hhhhhNubeh}(h]cipsov4-variablesah ]h"]cipsov4 variablesah$]h&]uh1hhhhhhhhM.ubh)}(hhh](h)}(h IP Variablesh]h IP Variables}(hjK-hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjH-hhhhhMVubh)}(hhh](h)}(hXip_local_port_range - 2 INTEGERS Defines the local port range that is used by TCP and UDP to choose the local port. The first number is the first, the second the last local port number. If possible, it is better these numbers have different parity (one even and one odd value). Must be greater than or equal to ip_unprivileged_port_start. The default values are 32768 and 60999 respectively. h](h)}(h ip_local_port_range - 2 INTEGERSh]h ip_local_port_range - 2 INTEGERS}(hj`-hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM_hj\-ubh)}(hhh]j)}(hXfDefines the local port range that is used by TCP and UDP to choose the local port. The first number is the first, the second the last local port number. If possible, it is better these numbers have different parity (one even and one odd value). Must be greater than or equal to ip_unprivileged_port_start. The default values are 32768 and 60999 respectively.h]hXfDefines the local port range that is used by TCP and UDP to choose the local port. The first number is the first, the second the last local port number. If possible, it is better these numbers have different parity (one even and one odd value). Must be greater than or equal to ip_unprivileged_port_start. The default values are 32768 and 60999 respectively.}(hjq-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMYhjn-ubah}(h]h ]h"]h$]h&]uh1hhj\-ubeh}(h]h ]h"]h$]h&]uh1hhhhM_hjY-ubh)}(hXip_local_reserved_ports - list of comma separated ranges Specify the ports which are reserved for known third-party applications. These ports will not be used by automatic port assignments (e.g. when calling connect() or bind() with port number 0). Explicit port allocation behavior is unchanged. The format used for both input and output is a comma separated list of ranges (e.g. "1,2-4,10-10" for ports 1, 2, 3, 4 and 10). Writing to the file will clear all previously reserved ports and update the current list with the one given in the input. Note that ip_local_port_range and ip_local_reserved_ports settings are independent and both are considered by the kernel when determining which ports are available for automatic port assignments. You can reserve ports which are not in the current ip_local_port_range, e.g.:: $ cat /proc/sys/net/ipv4/ip_local_port_range 32000 60999 $ cat /proc/sys/net/ipv4/ip_local_reserved_ports 8080,9148 although this is redundant. However such a setting is useful if later the port range is changed to a value that will include the reserved ports. Also keep in mind, that overlapping of these ranges may affect probability of selecting ephemeral ports which are right after block of reserved ports. Default: Empty h](h)}(h8ip_local_reserved_ports - list of comma separated rangesh]h8ip_local_reserved_ports - list of comma separated ranges}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj-ubh)}(hhh](j)}(hSpecify the ports which are reserved for known third-party applications. These ports will not be used by automatic port assignments (e.g. when calling connect() or bind() with port number 0). Explicit port allocation behavior is unchanged.h]hSpecify the ports which are reserved for known third-party applications. These ports will not be used by automatic port assignments (e.g. when calling connect() or bind() with port number 0). Explicit port allocation behavior is unchanged.}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMbhj-ubj)}(hThe format used for both input and output is a comma separated list of ranges (e.g. "1,2-4,10-10" for ports 1, 2, 3, 4 and 10). Writing to the file will clear all previously reserved ports and update the current list with the one given in the input.h]hThe format used for both input and output is a comma separated list of ranges (e.g. “1,2-4,10-10” for ports 1, 2, 3, 4 and 10). Writing to the file will clear all previously reserved ports and update the current list with the one given in the input.}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMghj-ubj)}(hNote that ip_local_port_range and ip_local_reserved_ports settings are independent and both are considered by the kernel when determining which ports are available for automatic port assignments.h]hNote that ip_local_port_range and ip_local_reserved_ports settings are independent and both are considered by the kernel when determining which ports are available for automatic port assignments.}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMmhj-ubj)}(hNYou can reserve ports which are not in the current ip_local_port_range, e.g.::h]hMYou can reserve ports which are not in the current ip_local_port_range, e.g.:}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMrhj-ubh literal_block)}(hy$ cat /proc/sys/net/ipv4/ip_local_port_range 32000 60999 $ cat /proc/sys/net/ipv4/ip_local_reserved_ports 8080,9148h]hy$ cat /proc/sys/net/ipv4/ip_local_port_range 32000 60999 $ cat /proc/sys/net/ipv4/ip_local_reserved_ports 8080,9148}hj-sbah}(h]h ]h"]h$]h&]hhuh1j-hhhMuhj-ubj)}(hX'although this is redundant. However such a setting is useful if later the port range is changed to a value that will include the reserved ports. Also keep in mind, that overlapping of these ranges may affect probability of selecting ephemeral ports which are right after block of reserved ports.h]hX'although this is redundant. However such a setting is useful if later the port range is changed to a value that will include the reserved ports. Also keep in mind, that overlapping of these ranges may affect probability of selecting ephemeral ports which are right after block of reserved ports.}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMzhj-ubj)}(hDefault: Emptyh]hDefault: Empty}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj-ubeh}(h]h ]h"]h$]h&]uh1hhj-ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hXLip_unprivileged_port_start - INTEGER This is a per-namespace sysctl. It defines the first unprivileged port in the network namespace. Privileged ports require root or CAP_NET_BIND_SERVICE in order to bind to them. To disable all privileged ports, set this to 0. They must not overlap with the ip_local_port_range. Default: 1024 h](h)}(h$ip_unprivileged_port_start - INTEGERh]h$ip_unprivileged_port_start - INTEGER}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj.ubh)}(hhh](j)}(hXThis is a per-namespace sysctl. It defines the first unprivileged port in the network namespace. Privileged ports require root or CAP_NET_BIND_SERVICE in order to bind to them. To disable all privileged ports, set this to 0. They must not overlap with the ip_local_port_range.h]hXThis is a per-namespace sysctl. It defines the first unprivileged port in the network namespace. Privileged ports require root or CAP_NET_BIND_SERVICE in order to bind to them. To disable all privileged ports, set this to 0. They must not overlap with the ip_local_port_range.}(hj%.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj".ubj)}(h Default: 1024h]h Default: 1024}(hj3.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj".ubeh}(h]h ]h"]h$]h&]uh1hhj.ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hip_nonlocal_bind - BOOLEAN If set, allows processes to bind() to non-local IP addresses, which can be quite useful - but may break some applications. Default: 0 h](h)}(hip_nonlocal_bind - BOOLEANh]hip_nonlocal_bind - BOOLEAN}(hjQ.hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjM.ubh)}(hhh](j)}(hzIf set, allows processes to bind() to non-local IP addresses, which can be quite useful - but may break some applications.h]hzIf set, allows processes to bind() to non-local IP addresses, which can be quite useful - but may break some applications.}(hjb.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj_.ubj)}(h Default: 0h]h Default: 0}(hjp.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj_.ubeh}(h]h ]h"]h$]h&]uh1hhjM.ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hXip_autobind_reuse - BOOLEAN By default, bind() does not select the ports automatically even if the new socket and all sockets bound to the port have SO_REUSEADDR. ip_autobind_reuse allows bind() to reuse the port and this is useful when you use bind()+connect(), but may break some applications. The preferred solution is to use IP_BIND_ADDRESS_NO_PORT and this option should only be set by experts. Default: 0 h](h)}(hip_autobind_reuse - BOOLEANh]hip_autobind_reuse - BOOLEAN}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj.ubh)}(hhh]j)}(hX~By default, bind() does not select the ports automatically even if the new socket and all sockets bound to the port have SO_REUSEADDR. ip_autobind_reuse allows bind() to reuse the port and this is useful when you use bind()+connect(), but may break some applications. The preferred solution is to use IP_BIND_ADDRESS_NO_PORT and this option should only be set by experts. Default: 0h]hX~By default, bind() does not select the ports automatically even if the new socket and all sockets bound to the port have SO_REUSEADDR. ip_autobind_reuse allows bind() to reuse the port and this is useful when you use bind()+connect(), but may break some applications. The preferred solution is to use IP_BIND_ADDRESS_NO_PORT and this option should only be set by experts. Default: 0}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj.ubah}(h]h ]h"]h$]h&]uh1hhj.ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hip_dynaddr - INTEGER If set non-zero, enables support for dynamic addresses. If set to a non-zero value larger than 1, a kernel log message will be printed when dynamic address rewriting occurs. Default: 0 h](h)}(hip_dynaddr - INTEGERh]hip_dynaddr - INTEGER}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj.ubh)}(hhh](j)}(hIf set non-zero, enables support for dynamic addresses. If set to a non-zero value larger than 1, a kernel log message will be printed when dynamic address rewriting occurs.h]hIf set non-zero, enables support for dynamic addresses. If set to a non-zero value larger than 1, a kernel log message will be printed when dynamic address rewriting occurs.}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj.ubj)}(h Default: 0h]h Default: 0}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj.ubeh}(h]h ]h"]h$]h&]uh1hhj.ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hXEip_early_demux - BOOLEAN Optimize input packet processing down to one demux for certain kinds of local sockets. Currently we only do this for established TCP and connected UDP sockets. It may add an additional cost for pure routing workloads that reduces overall throughput, in such case you should disable it. Default: 1 h](h)}(hip_early_demux - BOOLEANh]hip_early_demux - BOOLEAN}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj.ubh)}(hhh](j)}(hOptimize input packet processing down to one demux for certain kinds of local sockets. Currently we only do this for established TCP and connected UDP sockets.h]hOptimize input packet processing down to one demux for certain kinds of local sockets. Currently we only do this for established TCP and connected UDP sockets.}(hj /hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubj)}(h}It may add an additional cost for pure routing workloads that reduces overall throughput, in such case you should disable it.h]h}It may add an additional cost for pure routing workloads that reduces overall throughput, in such case you should disable it.}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubj)}(h Default: 1h]h Default: 1}(hj'/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubeh}(h]h ]h"]h$]h&]uh1hhj.ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hXiping_group_range - 2 INTEGERS Restrict ICMP_PROTO datagram sockets to users in the group range. The default is "1 0", meaning, that nobody (not even root) may create ping sockets. Setting it to "100 100" would grant permissions to the single group. "0 4294967294" would enable it for the world, "100 4294967294" would enable it for the users, but not daemons. h](h)}(hping_group_range - 2 INTEGERSh]hping_group_range - 2 INTEGERS}(hjE/hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjA/ubh)}(hhh]j)}(hXJRestrict ICMP_PROTO datagram sockets to users in the group range. The default is "1 0", meaning, that nobody (not even root) may create ping sockets. Setting it to "100 100" would grant permissions to the single group. "0 4294967294" would enable it for the world, "100 4294967294" would enable it for the users, but not daemons.h]hXZRestrict ICMP_PROTO datagram sockets to users in the group range. The default is “1 0”, meaning, that nobody (not even root) may create ping sockets. Setting it to “100 100” would grant permissions to the single group. “0 4294967294” would enable it for the world, “100 4294967294” would enable it for the users, but not daemons.}(hjV/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjS/ubah}(h]h ]h"]h$]h&]uh1hhjA/ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hVtcp_early_demux - BOOLEAN Enable early demux for established TCP sockets. Default: 1 h](h)}(htcp_early_demux - BOOLEANh]htcp_early_demux - BOOLEAN}(hjt/hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjp/ubh)}(hhh](j)}(h/Enable early demux for established TCP sockets.h]h/Enable early demux for established TCP sockets.}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubj)}(h Default: 1h]h Default: 1}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubeh}(h]h ]h"]h$]h&]uh1hhjp/ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hudp_early_demux - BOOLEAN Enable early demux for connected UDP sockets. Disable this if your system could experience more unconnected load. Default: 1 h](h)}(hudp_early_demux - BOOLEANh]hudp_early_demux - BOOLEAN}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj/ubh)}(hhh](j)}(hqEnable early demux for connected UDP sockets. Disable this if your system could experience more unconnected load.h]hqEnable early demux for connected UDP sockets. Disable this if your system could experience more unconnected load.}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubj)}(h Default: 1h]h Default: 1}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubeh}(h]h ]h"]h$]h&]uh1hhj/ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(h{icmp_echo_ignore_all - BOOLEAN If set non-zero, then the kernel will ignore all ICMP ECHO requests sent to it. Default: 0 h](h)}(hicmp_echo_ignore_all - BOOLEANh]hicmp_echo_ignore_all - BOOLEAN}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj/ubh)}(hhh](j)}(hOIf set non-zero, then the kernel will ignore all ICMP ECHO requests sent to it.h]hOIf set non-zero, then the kernel will ignore all ICMP ECHO requests sent to it.}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubj)}(h Default: 0h]h Default: 0}(hj 0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj/ubeh}(h]h ]h"]h$]h&]uh1hhj/ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hicmp_echo_enable_probe - BOOLEAN If set to one, then the kernel will respond to RFC 8335 PROBE requests sent to it. Default: 0 h](h)}(h icmp_echo_enable_probe - BOOLEANh]h icmp_echo_enable_probe - BOOLEAN}(hj+0hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj'0ubh)}(hhh](j)}(hRIf set to one, then the kernel will respond to RFC 8335 PROBE requests sent to it.h]hRIf set to one, then the kernel will respond to RFC 8335 PROBE requests sent to it.}(hj<0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj90ubj)}(h Default: 0h]h Default: 0}(hjJ0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj90ubeh}(h]h ]h"]h$]h&]uh1hhj'0ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hicmp_echo_ignore_broadcasts - BOOLEAN If set non-zero, then the kernel will ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast. Default: 1 h](h)}(h%icmp_echo_ignore_broadcasts - BOOLEANh]h%icmp_echo_ignore_broadcasts - BOOLEAN}(hjh0hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjd0ubh)}(hhh](j)}(huIf set non-zero, then the kernel will ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast.h]huIf set non-zero, then the kernel will ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast.}(hjy0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjv0ubj)}(h Default: 1h]h Default: 1}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjv0ubeh}(h]h ]h"]h$]h&]uh1hhjd0ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hXXicmp_ratelimit - INTEGER Limit the maximal rates for sending ICMP packets whose type matches icmp_ratemask (see below) to specific targets. 0 to disable any limiting, otherwise the minimal space between responses in milliseconds. Note that another sysctl, icmp_msgs_per_sec limits the number of ICMP packets sent on all targets. Default: 1000 h](h)}(hicmp_ratelimit - INTEGERh]hicmp_ratelimit - INTEGER}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj0ubh)}(hhh](j)}(hX/Limit the maximal rates for sending ICMP packets whose type matches icmp_ratemask (see below) to specific targets. 0 to disable any limiting, otherwise the minimal space between responses in milliseconds. Note that another sysctl, icmp_msgs_per_sec limits the number of ICMP packets sent on all targets.h]hX/Limit the maximal rates for sending ICMP packets whose type matches icmp_ratemask (see below) to specific targets. 0 to disable any limiting, otherwise the minimal space between responses in milliseconds. Note that another sysctl, icmp_msgs_per_sec limits the number of ICMP packets sent on all targets.}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj0ubj)}(h Default: 1000h]h Default: 1000}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj0ubeh}(h]h ]h"]h$]h&]uh1hhj0ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hXicmp_msgs_per_sec - INTEGER Limit maximal number of ICMP packets sent per second from this host. Only messages whose type matches icmp_ratemask (see below) are controlled by this limit. For security reasons, the precise count of messages per second is randomized. Default: 1000 h](h)}(hicmp_msgs_per_sec - INTEGERh]hicmp_msgs_per_sec - INTEGER}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj0ubh)}(hhh](j)}(hLimit maximal number of ICMP packets sent per second from this host. Only messages whose type matches icmp_ratemask (see below) are controlled by this limit. For security reasons, the precise count of messages per second is randomized.h]hLimit maximal number of ICMP packets sent per second from this host. Only messages whose type matches icmp_ratemask (see below) are controlled by this limit. For security reasons, the precise count of messages per second is randomized.}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj0ubj)}(h Default: 1000h]h Default: 1000}(hj1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj0ubeh}(h]h ]h"]h$]h&]uh1hhj0ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hicmp_msgs_burst - INTEGER icmp_msgs_per_sec controls number of ICMP packets sent per second, while icmp_msgs_burst controls the burst size of these packets. For security reasons, the precise burst size is randomized. Default: 50 h](h)}(hicmp_msgs_burst - INTEGERh]hicmp_msgs_burst - INTEGER}(hj1hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj1ubh)}(hhh](j)}(hicmp_msgs_per_sec controls number of ICMP packets sent per second, while icmp_msgs_burst controls the burst size of these packets. For security reasons, the precise burst size is randomized.h]hicmp_msgs_per_sec controls number of ICMP packets sent per second, while icmp_msgs_burst controls the burst size of these packets. For security reasons, the precise burst size is randomized.}(hj01hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj-1ubj)}(h Default: 50h]h Default: 50}(hj>1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj-1ubeh}(h]h ]h"]h$]h&]uh1hhj1ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hXicmp_ratemask - INTEGER Mask made of ICMP types for which rates are being limited. Significant bits: IHGFEDCBA9876543210 Default mask: 0000001100000011000 (6168) Bit definitions (see include/linux/icmp.h): = ========================= 0 Echo Reply 3 Destination Unreachable [1]_ 4 Source Quench [1]_ 5 Redirect 8 Echo Request B Time Exceeded [1]_ C Parameter Problem [1]_ D Timestamp Request E Timestamp Reply F Info Request G Info Reply H Address Mask Request I Address Mask Reply = ========================= .. [1] These are rate limited by default (see default mask above) h](h)}(hicmp_ratemask - INTEGERh]hicmp_ratemask - INTEGER}(hj\1hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjX1ubh)}(hhh](j)}(h:Mask made of ICMP types for which rates are being limited.h]h:Mask made of ICMP types for which rates are being limited.}(hjm1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjj1ubj)}(h%Significant bits: IHGFEDCBA9876543210h]h%Significant bits: IHGFEDCBA9876543210}(hj{1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjj1ubj)}(h,Default mask: 0000001100000011000 (6168)h]h,Default mask: 0000001100000011000 (6168)}(hj1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjj1ubj)}(h+Bit definitions (see include/linux/icmp.h):h]h+Bit definitions (see include/linux/icmp.h):}(hj1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjj1ubj )}(hX/= ========================= 0 Echo Reply 3 Destination Unreachable [1]_ 4 Source Quench [1]_ 5 Redirect 8 Echo Request B Time Exceeded [1]_ C Parameter Problem [1]_ D Timestamp Request E Timestamp Reply F Info Request G Info Reply H Address Mask Request I Address Mask Reply = ========================= h]j[)}(hhh]j`)}(hhh](je)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhj1ubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhj1ubj{)}(hhh](j)}(hhh](j)}(hhh]j)}(hjh]h0}(hj1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj1ubah}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh]j)}(h Echo Replyh]h Echo Reply}(hj1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj1ubah}(h]h ]h"]h$]h&]uh1jhj1ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(h3h]h3}(hj2hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj1ubah}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh]j)}(hDestination Unreachable [1]_h](hDestination Unreachable }(hj2hhhNhNubhfootnote_reference)}(h[1]_h]h1}(hj#2hhhNhNubah}(h]id1ah ]h"]h$]h&]refidid5docnamenetworking/ip-sysctluh1j!2hj2resolvedKubeh}(h]h ]h"]h$]h&]uh1jhhhMhj2ubah}(h]h ]h"]h$]h&]uh1jhj1ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(h4h]h4}(hjO2hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjL2ubah}(h]h ]h"]h$]h&]uh1jhjI2ubj)}(hhh]j)}(hSource Quench [1]_h](hSource Quench }(hjf2hhhNhNubj"2)}(h[1]_h]h1}(hjn2hhhNhNubah}(h]id2ah ]h"]h$]h&]j22j32j42j52uh1j!2hjf2j62Kubeh}(h]h ]h"]h$]h&]uh1jhhhMhjc2ubah}(h]h ]h"]h$]h&]uh1jhjI2ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(h5h]h5}(hj2hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj2ubah}(h]h ]h"]h$]h&]uh1jhj2ubj)}(hhh]j)}(hRedirecth]hRedirect}(hj2hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj2ubah}(h]h ]h"]h$]h&]uh1jhj2ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(h8h]h8}(hj2hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj2ubah}(h]h ]h"]h$]h&]uh1jhj2ubj)}(hhh]j)}(h Echo Requesth]h Echo Request}(hj2hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj2ubah}(h]h ]h"]h$]h&]uh1jhj2ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(hBh]hB}(hj3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3ubah}(h]h ]h"]h$]h&]uh1jhj2ubj)}(hhh]j)}(hTime Exceeded [1]_h](hTime Exceeded }(hj3hhhNhNubj"2)}(h[1]_h]h1}(hj"3hhhNhNubah}(h]id3ah ]h"]h$]h&]j22j32j42j52uh1j!2hj3j62Kubeh}(h]h ]h"]h$]h&]uh1jhhhMhj3ubah}(h]h ]h"]h$]h&]uh1jhj2ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(hCh]hC}(hjI3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjF3ubah}(h]h ]h"]h$]h&]uh1jhjC3ubj)}(hhh]j)}(hParameter Problem [1]_h](hParameter Problem }(hj`3hhhNhNubj"2)}(h[1]_h]h1}(hjh3hhhNhNubah}(h]id4ah ]h"]h$]h&]j22j32j42j52uh1j!2hj`3j62Kubeh}(h]h ]h"]h$]h&]uh1jhhhMhj]3ubah}(h]h ]h"]h$]h&]uh1jhjC3ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(hDh]hD}(hj3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3ubah}(h]h ]h"]h$]h&]uh1jhj3ubj)}(hhh]j)}(hTimestamp Requesth]hTimestamp Request}(hj3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3ubah}(h]h ]h"]h$]h&]uh1jhj3ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(hEh]hE}(hj3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3ubah}(h]h ]h"]h$]h&]uh1jhj3ubj)}(hhh]j)}(hTimestamp Replyh]hTimestamp Reply}(hj3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3ubah}(h]h ]h"]h$]h&]uh1jhj3ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(hFh]hF}(hj3hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3ubah}(h]h ]h"]h$]h&]uh1jhj3ubj)}(hhh]j)}(h Info Requesth]h Info Request}(hj4hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj4ubah}(h]h ]h"]h$]h&]uh1jhj3ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(hGh]hG}(hj44hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj14ubah}(h]h ]h"]h$]h&]uh1jhj.4ubj)}(hhh]j)}(h Info Replyh]h Info Reply}(hjK4hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjH4ubah}(h]h ]h"]h$]h&]uh1jhj.4ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(hHh]hH}(hjk4hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjh4ubah}(h]h ]h"]h$]h&]uh1jhje4ubj)}(hhh]j)}(hAddress Mask Requesth]hAddress Mask Request}(hj4hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj4ubah}(h]h ]h"]h$]h&]uh1jhje4ubeh}(h]h ]h"]h$]h&]uh1jhj1ubj)}(hhh](j)}(hhh]j)}(hIh]hI}(hj4hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj4ubah}(h]h ]h"]h$]h&]uh1jhj4ubj)}(hhh]j)}(hAddress Mask Replyh]hAddress Mask Reply}(hj4hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj4ubah}(h]h ]h"]h$]h&]uh1jhj4ubeh}(h]h ]h"]h$]h&]uh1jhj1ubeh}(h]h ]h"]h$]h&]uh1jzhj1ubeh}(h]h ]h"]h$]h&]colsKuh1j_hj1ubah}(h]h ]h"]h$]h&]uh1jZhj1ubah}(h]h ]h"]h$]h&]uh1j hhhMhjj1ubhfootnote)}(h;These are rate limited by default (see default mask above) h](hlabel)}(h1h]h1}(hj4hhhNhNubah}(h]h ]h"]h$]h&]uh1j4hj4ubj)}(h:These are rate limited by default (see default mask above)h]h:These are rate limited by default (see default mask above)}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj4ubeh}(h]j32ah ]h"]1ah$]h&](j-2jx2j,3jr3ej42j52uh1j4hhhMhjj1j62Kubeh}(h]h ]h"]h$]h&]uh1hhjX1ubeh}(h]h ]h"]h$]h&]uh1hhhhMhjY-hhubh)}(hX#icmp_ignore_bogus_error_responses - BOOLEAN Some routers violate RFC1122 by sending bogus responses to broadcast frames. Such violations are normally logged via a kernel warning. If this is set to TRUE, the kernel will not give such warnings, which will avoid log file clutter. Default: 1 h](h)}(h+icmp_ignore_bogus_error_responses - BOOLEANh]h+icmp_ignore_bogus_error_responses - BOOLEAN}(hj'5hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj#5ubh)}(hhh](j)}(hSome routers violate RFC1122 by sending bogus responses to broadcast frames. Such violations are normally logged via a kernel warning. If this is set to TRUE, the kernel will not give such warnings, which will avoid log file clutter._h]hSome routers violate RFC1122 by sending bogus responses to broadcast frames. Such violations are normally logged via a kernel warning. If this is set to TRUE, the kernel will not give such warnings, which will avoid log file clutter.}(hj85hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj55ubj)}(h Default: 1h]h Default: 1}(hjF5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj55ubeh}(h]h ]h"]h$]h&]uh1hhj#5ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjY-hhubeh}(h]h ]h"]h$]h&]uh1hhjH-hhhhhNubj)}(h(icmp_errors_use_inbound_ifaddr - BOOLEANh]h(icmp_errors_use_inbound_ifaddr - BOOLEAN}(hjf5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjH-hhubj )}(hX2If zero, icmp error messages are sent with the primary address of the exiting interface. If non-zero, the message will be sent with the primary address of the interface that received the packet that caused the icmp error. This is the behaviour many network administrators will expect from a router. And it can make debugging complicated network layouts much easier. Note that if no primary address exists for the interface selected, then the primary address of the first non-loopback interface that has one will be used regardless of this setting. Default: 0 h](j)}(hXIf zero, icmp error messages are sent with the primary address of the exiting interface.h]hXIf zero, icmp error messages are sent with the primary address of the exiting interface.}(hjx5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjt5ubj)}(hXIf non-zero, the message will be sent with the primary address of the interface that received the packet that caused the icmp error. This is the behaviour many network administrators will expect from a router. And it can make debugging complicated network layouts much easier.h]hXIf non-zero, the message will be sent with the primary address of the interface that received the packet that caused the icmp error. This is the behaviour many network administrators will expect from a router. And it can make debugging complicated network layouts much easier.}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjt5ubj)}(hNote that if no primary address exists for the interface selected, then the primary address of the first non-loopback interface that has one will be used regardless of this setting.h]hNote that if no primary address exists for the interface selected, then the primary address of the first non-loopback interface that has one will be used regardless of this setting.}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjt5ubj)}(h Default: 0h]h Default: 0}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjt5ubeh}(h]h ]h"]h$]h&]uh1j hhhMhjH-hhubh)}(hhh](h)}(hXigmp_max_memberships - INTEGER Change the maximum number of multicast groups we can subscribe to. Default: 20 Theoretical maximum value is bounded by having to send a membership report in a single datagram (i.e. the report can't span multiple datagrams, or risk confusing the switch and leaving groups you don't intend to). The number of supported groups 'M' is bounded by the number of group report entries you can fit into a single datagram of 65535 bytes. M = 65536-sizeof (ip header)/(sizeof(Group record)) Group records are variable length, with a minimum of 12 bytes. So net.ipv4.igmp_max_memberships should not be set higher than: (65536-24) / 12 = 5459 The value 5459 assumes no IP header options, so in practice this number may be lower. h](h)}(higmp_max_memberships - INTEGERh]higmp_max_memberships - INTEGER}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM1hj5ubh)}(hhh](j)}(hNChange the maximum number of multicast groups we can subscribe to. Default: 20h]hNChange the maximum number of multicast groups we can subscribe to. Default: 20}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj5ubj)}(hTheoretical maximum value is bounded by having to send a membership report in a single datagram (i.e. the report can't span multiple datagrams, or risk confusing the switch and leaving groups you don't intend to).h]hTheoretical maximum value is bounded by having to send a membership report in a single datagram (i.e. the report can’t span multiple datagrams, or risk confusing the switch and leaving groups you don’t intend to).}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM!hj5ubj)}(hThe number of supported groups 'M' is bounded by the number of group report entries you can fit into a single datagram of 65535 bytes.h]hThe number of supported groups ‘M’ is bounded by the number of group report entries you can fit into a single datagram of 65535 bytes.}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM&hj5ubj)}(h3M = 65536-sizeof (ip header)/(sizeof(Group record))h]h3M = 65536-sizeof (ip header)/(sizeof(Group record))}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM)hj5ubj)}(h~Group records are variable length, with a minimum of 12 bytes. So net.ipv4.igmp_max_memberships should not be set higher than:h]h~Group records are variable length, with a minimum of 12 bytes. So net.ipv4.igmp_max_memberships should not be set higher than:}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM+hj5ubj)}(h(65536-24) / 12 = 5459h]h(65536-24) / 12 = 5459}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM.hj5ubj)}(hUThe value 5459 assumes no IP header options, so in practice this number may be lower.h]hUThe value 5459 assumes no IP header options, so in practice this number may be lower.}(hj"6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM0hj5ubeh}(h]h ]h"]h$]h&]uh1hhj5ubeh}(h]h ]h"]h$]h&]uh1hhhhM1hj5ubh)}(hyigmp_max_msf - INTEGER Maximum number of addresses allowed in the source filter list for a multicast group. Default: 10 h](h)}(higmp_max_msf - INTEGERh]higmp_max_msf - INTEGER}(hj@6hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM7hj<6ubh)}(hhh](j)}(hTMaximum number of addresses allowed in the source filter list for a multicast group.h]hTMaximum number of addresses allowed in the source filter list for a multicast group.}(hjQ6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM4hjN6ubj)}(h Default: 10h]h Default: 10}(hj_6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM7hjN6ubeh}(h]h ]h"]h$]h&]uh1hhj<6ubeh}(h]h ]h"]h$]h&]uh1hhhhM7hj5hhubh)}(higmp_qrv - INTEGER Controls the IGMP query robustness variable (see RFC2236 8.1). Default: 2 (as specified by RFC2236 8.1) Minimum: 1 (as specified by RFC6636 4.5) h](h)}(higmp_qrv - INTEGERh]higmp_qrv - INTEGER}(hj}6hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM>hjy6ubh)}(hhh](j)}(h>Controls the IGMP query robustness variable (see RFC2236 8.1).h]h>Controls the IGMP query robustness variable (see RFC2236 8.1).}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM:hj6ubj)}(h(Default: 2 (as specified by RFC2236 8.1)h]h(Default: 2 (as specified by RFC2236 8.1)}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM<hj6ubj)}(h(Minimum: 1 (as specified by RFC6636 4.5)h]h(Minimum: 1 (as specified by RFC6636 4.5)}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM>hj6ubeh}(h]h ]h"]h$]h&]uh1hhjy6ubeh}(h]h ]h"]h$]h&]uh1hhhhM>hj5hhubh)}(hXforce_igmp_version - INTEGER - 0 - (default) No enforcement of a IGMP version, IGMPv1/v2 fallback allowed. Will back to IGMPv3 mode again if all IGMPv1/v2 Querier Present timer expires. - 1 - Enforce to use IGMP version 1. Will also reply IGMPv1 report if receive IGMPv2/v3 query. - 2 - Enforce to use IGMP version 2. Will fallback to IGMPv1 if receive IGMPv1 query message. Will reply report if receive IGMPv3 query. - 3 - Enforce to use IGMP version 3. The same react with default 0. .. note:: this is not the same with force_mld_version because IGMPv3 RFC3376 Security Considerations does not have clear description that we could ignore other version messages completely as MLDv2 RFC3810. So make this value as default 0 is recommended. h](h)}(hforce_igmp_version - INTEGERh]hforce_igmp_version - INTEGER}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMOhj6ubh)}(hhh](h)}(hhh](j)}(h0 - (default) No enforcement of a IGMP version, IGMPv1/v2 fallback allowed. Will back to IGMPv3 mode again if all IGMPv1/v2 Querier Present timer expires.h]j)}(h0 - (default) No enforcement of a IGMP version, IGMPv1/v2 fallback allowed. Will back to IGMPv3 mode again if all IGMPv1/v2 Querier Present timer expires.h]h0 - (default) No enforcement of a IGMP version, IGMPv1/v2 fallback allowed. Will back to IGMPv3 mode again if all IGMPv1/v2 Querier Present timer expires.}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMAhj6ubah}(h]h ]h"]h$]h&]uh1hhj6ubj)}(h\1 - Enforce to use IGMP version 1. Will also reply IGMPv1 report if receive IGMPv2/v3 query.h]j)}(h\1 - Enforce to use IGMP version 1. Will also reply IGMPv1 report if receive IGMPv2/v3 query.h]h\1 - Enforce to use IGMP version 1. Will also reply IGMPv1 report if receive IGMPv2/v3 query.}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMDhj6ubah}(h]h ]h"]h$]h&]uh1hhj6ubj)}(h2 - Enforce to use IGMP version 2. Will fallback to IGMPv1 if receive IGMPv1 query message. Will reply report if receive IGMPv3 query.h]j)}(h2 - Enforce to use IGMP version 2. Will fallback to IGMPv1 if receive IGMPv1 query message. Will reply report if receive IGMPv3 query.h]h2 - Enforce to use IGMP version 2. Will fallback to IGMPv1 if receive IGMPv1 query message. Will reply report if receive IGMPv3 query.}(hj7hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMFhj 7ubah}(h]h ]h"]h$]h&]uh1hhj6ubj)}(hB3 - Enforce to use IGMP version 3. The same react with default 0. h]j)}(hA3 - Enforce to use IGMP version 3. The same react with default 0.h]hA3 - Enforce to use IGMP version 3. The same react with default 0.}(hj(7hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMHhj$7ubah}(h]h ]h"]h$]h&]uh1hhj6ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMAhj6ubhnote)}(hthis is not the same with force_mld_version because IGMPv3 RFC3376 Security Considerations does not have clear description that we could ignore other version messages completely as MLDv2 RFC3810. So make this value as default 0 is recommended.h]j)}(hthis is not the same with force_mld_version because IGMPv3 RFC3376 Security Considerations does not have clear description that we could ignore other version messages completely as MLDv2 RFC3810. So make this value as default 0 is recommended.h]hthis is not the same with force_mld_version because IGMPv3 RFC3376 Security Considerations does not have clear description that we could ignore other version messages completely as MLDv2 RFC3810. So make this value as default 0 is recommended.}(hjH7hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMLhjD7ubah}(h]h ]h"]h$]h&]uh1jB7hj6ubeh}(h]h ]h"]h$]h&]uh1hhj6ubeh}(h]h ]h"]h$]h&]uh1hhhhMOhj5hhubh)}(hu``conf/interface/*`` changes special settings per interface (where interface" is the name of your network interface) h](h)}(h``conf/interface/*``h]hliteral)}(hjn7h]hconf/interface/*}(hjr7hhhNhNubah}(h]h ]h"]h$]h&]uh1jp7hjl7ubah}(h]h ]h"]h$]h&]uh1hhhhMShjh7ubh)}(hhh]j)}(h_changes special settings per interface (where interface" is the name of your network interface)h]hachanges special settings per interface (where interface” is the name of your network interface)}(hj7hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMRhj7ubah}(h]h ]h"]h$]h&]uh1hhjh7ubeh}(h]h ]h"]h$]h&]uh1hhhhMShj5hhubh)}(hC``conf/all/*`` is special, changes the settings for all interfaces h](h)}(h``conf/all/*``h]jq7)}(hj7h]h conf/all/*}(hj7hhhNhNubah}(h]h ]h"]h$]h&]uh1jp7hj7ubah}(h]h ]h"]h$]h&]uh1hhhhMVhj7ubh)}(hhh]j)}(h3is special, changes the settings for all interfacesh]h3is special, changes the settings for all interfaces}(hj7hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMVhj7ubah}(h]h ]h"]h$]h&]uh1hhj7ubeh}(h]h ]h"]h$]h&]uh1hhhhMVhj5hhubh)}(hlog_martians - BOOLEAN Log packets with impossible addresses to kernel log. log_martians for the interface will be enabled if at least one of conf/{all,interface}/log_martians is set to TRUE, it will be disabled otherwise h](h)}(hlog_martians - BOOLEANh]hlog_martians - BOOLEAN}(hj7hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM\hj7ubh)}(hhh]j)}(hLog packets with impossible addresses to kernel log. log_martians for the interface will be enabled if at least one of conf/{all,interface}/log_martians is set to TRUE, it will be disabled otherwiseh]hLog packets with impossible addresses to kernel log. log_martians for the interface will be enabled if at least one of conf/{all,interface}/log_martians is set to TRUE, it will be disabled otherwise}(hj7hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMYhj7ubah}(h]h ]h"]h$]h&]uh1hhj7ubeh}(h]h ]h"]h$]h&]uh1hhhhM\hj5hhubh)}(hXaccept_redirects - BOOLEAN Accept ICMP redirect messages. accept_redirects for the interface will be enabled if: - both conf/{all,interface}/accept_redirects are TRUE in the case forwarding for the interface is enabled or - at least one of conf/{all,interface}/accept_redirects is TRUE in the case forwarding for the interface is disabled accept_redirects for the interface will be disabled otherwise default: - TRUE (host) - FALSE (router) h](h)}(haccept_redirects - BOOLEANh]haccept_redirects - BOOLEAN}(hj 8hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMohj 8ubh)}(hhh](j)}(hUAccept ICMP redirect messages. accept_redirects for the interface will be enabled if:h]hUAccept ICMP redirect messages. accept_redirects for the interface will be enabled if:}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM_hj8ubh)}(hhh]j)}(hhboth conf/{all,interface}/accept_redirects are TRUE in the case forwarding for the interface is enabled h]j)}(hgboth conf/{all,interface}/accept_redirects are TRUE in the case forwarding for the interface is enabledh]hgboth conf/{all,interface}/accept_redirects are TRUE in the case forwarding for the interface is enabled}(hj38hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMbhj/8ubah}(h]h ]h"]h$]h&]uh1hhj,8ubah}(h]h ]h"]h$]h&]j8j9uh1hhhhMbhj8ubj)}(horh]hor}(hjM8hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMehj8ubh)}(hhh]j)}(hsat least one of conf/{all,interface}/accept_redirects is TRUE in the case forwarding for the interface is disabled h]j)}(hrat least one of conf/{all,interface}/accept_redirects is TRUE in the case forwarding for the interface is disabledh]hrat least one of conf/{all,interface}/accept_redirects is TRUE in the case forwarding for the interface is disabled}(hjb8hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMghj^8ubah}(h]h ]h"]h$]h&]uh1hhj[8ubah}(h]h ]h"]h$]h&]j8j9uh1hhhhMghj8ubj)}(h=accept_redirects for the interface will be disabled otherwiseh]h=accept_redirects for the interface will be disabled otherwise}(hj|8hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMjhj8ubj)}(hdefault:h]hdefault:}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMlhj8ubj )}(h- TRUE (host) - FALSE (router) h]h)}(hhh](j)}(h TRUE (host)h]j)}(hj8h]h TRUE (host)}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMnhj8ubah}(h]h ]h"]h$]h&]uh1hhj8ubj)}(hFALSE (router) h]j)}(hFALSE (router)h]hFALSE (router)}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMohj8ubah}(h]h ]h"]h$]h&]uh1hhj8ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMnhj8ubah}(h]h ]h"]h$]h&]uh1j hhhMnhj8ubeh}(h]h ]h"]h$]h&]uh1hhj 8ubeh}(h]h ]h"]h$]h&]uh1hhhhMohj5hhubh)}(hforwarding - BOOLEAN Enable IP forwarding on this interface. This controls whether packets received _on_ this interface can be forwarded. h](h)}(hforwarding - BOOLEANh]hforwarding - BOOLEAN}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMshj8ubh)}(hhh]j)}(huEnable IP forwarding on this interface. This controls whether packets received _on_ this interface can be forwarded.h]huEnable IP forwarding on this interface. This controls whether packets received _on_ this interface can be forwarded.}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMrhj8ubah}(h]h ]h"]h$]h&]uh1hhj8ubeh}(h]h ]h"]h$]h&]uh1hhhhMshj5hhubh)}(hmc_forwarding - BOOLEAN Do multicast routing. The kernel needs to be compiled with CONFIG_MROUTE and a multicast routing daemon is required. conf/all/mc_forwarding must also be set to TRUE to enable multicast routing for the interface h](h)}(hmc_forwarding - BOOLEANh]hmc_forwarding - BOOLEAN}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMyhj9ubh)}(hhh]j)}(hDo multicast routing. The kernel needs to be compiled with CONFIG_MROUTE and a multicast routing daemon is required. conf/all/mc_forwarding must also be set to TRUE to enable multicast routing for the interfaceh]hDo multicast routing. The kernel needs to be compiled with CONFIG_MROUTE and a multicast routing daemon is required. conf/all/mc_forwarding must also be set to TRUE to enable multicast routing for the interface}(hj*9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMvhj'9ubah}(h]h ]h"]h$]h&]uh1hhj9ubeh}(h]h ]h"]h$]h&]uh1hhhhMyhj5hhubh)}(hXmedium_id - INTEGER Integer value used to differentiate the devices by the medium they are attached to. Two devices can have different id values when the broadcast packets are received only on one of them. The default value 0 means that the device is the only interface to its medium, value of -1 means that medium is not known. Currently, it is used to change the proxy_arp behavior: the proxy_arp feature is enabled for packets forwarded between two devices attached to different media. h](h)}(hmedium_id - INTEGERh]hmedium_id - INTEGER}(hjH9hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjD9ubh)}(hhh](j)}(hX4Integer value used to differentiate the devices by the medium they are attached to. Two devices can have different id values when the broadcast packets are received only on one of them. The default value 0 means that the device is the only interface to its medium, value of -1 means that medium is not known.h]hX4Integer value used to differentiate the devices by the medium they are attached to. Two devices can have different id values when the broadcast packets are received only on one of them. The default value 0 means that the device is the only interface to its medium, value of -1 means that medium is not known.}(hjY9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM|hjV9ubj)}(hCurrently, it is used to change the proxy_arp behavior: the proxy_arp feature is enabled for packets forwarded between two devices attached to different media.h]hCurrently, it is used to change the proxy_arp behavior: the proxy_arp feature is enabled for packets forwarded between two devices attached to different media.}(hjg9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjV9ubeh}(h]h ]h"]h$]h&]uh1hhjD9ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hproxy_arp - BOOLEAN Do proxy arp. proxy_arp for the interface will be enabled if at least one of conf/{all,interface}/proxy_arp is set to TRUE, it will be disabled otherwise h](h)}(hproxy_arp - BOOLEANh]hproxy_arp - BOOLEAN}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj9ubh)}(hhh](j)}(h Do proxy arp.h]h Do proxy arp.}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj9ubj)}(hproxy_arp for the interface will be enabled if at least one of conf/{all,interface}/proxy_arp is set to TRUE, it will be disabled otherwiseh]hproxy_arp for the interface will be enabled if at least one of conf/{all,interface}/proxy_arp is set to TRUE, it will be disabled otherwise}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj9ubeh}(h]h ]h"]h$]h&]uh1hhj9ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hXproxy_arp_pvlan - BOOLEAN Private VLAN proxy arp. Basically allow proxy arp replies back to the same interface (from which the ARP request/solicitation was received). This is done to support (ethernet) switch features, like RFC 3069, where the individual ports are NOT allowed to communicate with each other, but they are allowed to talk to the upstream router. As described in RFC 3069, it is possible to allow these hosts to communicate through the upstream router by proxy_arp'ing. Don't need to be used together with proxy_arp. This technology is known by different names: In RFC 3069 it is called VLAN Aggregation. Cisco and Allied Telesyn call it Private VLAN. Hewlett-Packard call it Source-Port filtering or port-isolation. Ericsson call it MAC-Forced Forwarding (RFC Draft). h](h)}(hproxy_arp_pvlan - BOOLEANh]hproxy_arp_pvlan - BOOLEAN}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj9ubh)}(hhh](j)}(hPrivate VLAN proxy arp.h]hPrivate VLAN proxy arp.}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj9ubj)}(htBasically allow proxy arp replies back to the same interface (from which the ARP request/solicitation was received).h]htBasically allow proxy arp replies back to the same interface (from which the ARP request/solicitation was received).}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj9ubj)}(hXmThis is done to support (ethernet) switch features, like RFC 3069, where the individual ports are NOT allowed to communicate with each other, but they are allowed to talk to the upstream router. As described in RFC 3069, it is possible to allow these hosts to communicate through the upstream router by proxy_arp'ing. Don't need to be used together with proxy_arp.h]hXqThis is done to support (ethernet) switch features, like RFC 3069, where the individual ports are NOT allowed to communicate with each other, but they are allowed to talk to the upstream router. As described in RFC 3069, it is possible to allow these hosts to communicate through the upstream router by proxy_arp’ing. Don’t need to be used together with proxy_arp.}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj9ubj)}(h,This technology is known by different names:h]h,This technology is known by different names:}(hj9hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj9ubj )}(hIn RFC 3069 it is called VLAN Aggregation. Cisco and Allied Telesyn call it Private VLAN. Hewlett-Packard call it Source-Port filtering or port-isolation. Ericsson call it MAC-Forced Forwarding (RFC Draft). h]j)}(hIn RFC 3069 it is called VLAN Aggregation. Cisco and Allied Telesyn call it Private VLAN. Hewlett-Packard call it Source-Port filtering or port-isolation. Ericsson call it MAC-Forced Forwarding (RFC Draft).h]hIn RFC 3069 it is called VLAN Aggregation. Cisco and Allied Telesyn call it Private VLAN. Hewlett-Packard call it Source-Port filtering or port-isolation. Ericsson call it MAC-Forced Forwarding (RFC Draft).}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj :ubah}(h]h ]h"]h$]h&]uh1j hhhMhj9ubeh}(h]h ]h"]h$]h&]uh1hhj9ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hXproxy_delay - INTEGER Delay proxy response. Delay response to a neighbor solicitation when proxy_arp or proxy_ndp is enabled. A random value between [0, proxy_delay) will be chosen, setting to zero means reply with no delay. Value in jiffies. Defaults to 80. h](h)}(hproxy_delay - INTEGERh]hproxy_delay - INTEGER}(hj3:hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj/:ubh)}(hhh](j)}(hDelay proxy response.h]hDelay proxy response.}(hjD:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjA:ubj)}(hDelay response to a neighbor solicitation when proxy_arp or proxy_ndp is enabled. A random value between [0, proxy_delay) will be chosen, setting to zero means reply with no delay. Value in jiffies. Defaults to 80.h]hDelay response to a neighbor solicitation when proxy_arp or proxy_ndp is enabled. A random value between [0, proxy_delay) will be chosen, setting to zero means reply with no delay. Value in jiffies. Defaults to 80.}(hjR:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjA:ubeh}(h]h ]h"]h$]h&]uh1hhj/:ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hXshared_media - BOOLEAN Send(router) or accept(host) RFC1620 shared media redirects. Overrides secure_redirects. shared_media for the interface will be enabled if at least one of conf/{all,interface}/shared_media is set to TRUE, it will be disabled otherwise default TRUE h](h)}(hshared_media - BOOLEANh]hshared_media - BOOLEAN}(hjp:hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjl:ubh)}(hhh](j)}(hXSend(router) or accept(host) RFC1620 shared media redirects. Overrides secure_redirects.h]hXSend(router) or accept(host) RFC1620 shared media redirects. Overrides secure_redirects.}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj~:ubj)}(hshared_media for the interface will be enabled if at least one of conf/{all,interface}/shared_media is set to TRUE, it will be disabled otherwiseh]hshared_media for the interface will be enabled if at least one of conf/{all,interface}/shared_media is set to TRUE, it will be disabled otherwise}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj~:ubj)}(h default TRUEh]h default TRUE}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj~:ubeh}(h]h ]h"]h$]h&]uh1hhjl:ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hXvsecure_redirects - BOOLEAN Accept ICMP redirect messages only to gateways listed in the interface's current gateway list. Even if disabled, RFC1122 redirect rules still apply. Overridden by shared_media. secure_redirects for the interface will be enabled if at least one of conf/{all,interface}/secure_redirects is set to TRUE, it will be disabled otherwise default TRUE h](h)}(hsecure_redirects - BOOLEANh]hsecure_redirects - BOOLEAN}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj:ubh)}(hhh](j)}(hAccept ICMP redirect messages only to gateways listed in the interface's current gateway list. Even if disabled, RFC1122 redirect rules still apply.h]hAccept ICMP redirect messages only to gateways listed in the interface’s current gateway list. Even if disabled, RFC1122 redirect rules still apply.}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj:ubj)}(hOverridden by shared_media.h]hOverridden by shared_media.}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj:ubj)}(hsecure_redirects for the interface will be enabled if at least one of conf/{all,interface}/secure_redirects is set to TRUE, it will be disabled otherwiseh]hsecure_redirects for the interface will be enabled if at least one of conf/{all,interface}/secure_redirects is set to TRUE, it will be disabled otherwise}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj:ubj)}(h default TRUEh]h default TRUE}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj:ubeh}(h]h ]h"]h$]h&]uh1hhj:ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hsend_redirects - BOOLEAN Send redirects, if router. send_redirects for the interface will be enabled if at least one of conf/{all,interface}/send_redirects is set to TRUE, it will be disabled otherwise Default: TRUE h](h)}(hsend_redirects - BOOLEANh]hsend_redirects - BOOLEAN}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj;ubh)}(hhh](j)}(hSend redirects, if router.h]hSend redirects, if router.}(hj%;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj";ubj)}(hsend_redirects for the interface will be enabled if at least one of conf/{all,interface}/send_redirects is set to TRUE, it will be disabled otherwiseh]hsend_redirects for the interface will be enabled if at least one of conf/{all,interface}/send_redirects is set to TRUE, it will be disabled otherwise}(hj3;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj";ubj)}(h Default: TRUEh]h Default: TRUE}(hjA;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj";ubeh}(h]h ]h"]h$]h&]uh1hhj;ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hX2bootp_relay - BOOLEAN Accept packets with source address 0.b.c.d destined not to this host as local ones. It is supposed, that BOOTP relay daemon will catch and forward such packets. conf/all/bootp_relay must also be set to TRUE to enable BOOTP relay for the interface default FALSE Not Implemented Yet. h](h)}(hbootp_relay - BOOLEANh]hbootp_relay - BOOLEAN}(hj_;hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj[;ubh)}(hhh](j)}(hAccept packets with source address 0.b.c.d destined not to this host as local ones. It is supposed, that BOOTP relay daemon will catch and forward such packets. conf/all/bootp_relay must also be set to TRUE to enable BOOTP relay for the interfaceh]hAccept packets with source address 0.b.c.d destined not to this host as local ones. It is supposed, that BOOTP relay daemon will catch and forward such packets. conf/all/bootp_relay must also be set to TRUE to enable BOOTP relay for the interface}(hjp;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjm;ubj)}(h default FALSEh]h default FALSE}(hj~;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjm;ubj)}(hNot Implemented Yet.h]hNot Implemented Yet.}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjm;ubeh}(h]h ]h"]h$]h&]uh1hhj[;ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(haccept_source_route - BOOLEAN Accept packets with SRR option. conf/all/accept_source_route must also be set to TRUE to accept packets with SRR option on the interface default - TRUE (router) - FALSE (host) h](h)}(haccept_source_route - BOOLEANh]haccept_source_route - BOOLEAN}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj;ubh)}(hhh](j)}(hAccept packets with SRR option. conf/all/accept_source_route must also be set to TRUE to accept packets with SRR option on the interfaceh]hAccept packets with SRR option. conf/all/accept_source_route must also be set to TRUE to accept packets with SRR option on the interface}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj;ubj)}(hdefaulth]hdefault}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj;ubj )}(h- TRUE (router) - FALSE (host) h]h)}(hhh](j)}(h TRUE (router)h]j)}(hj;h]h TRUE (router)}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj;ubah}(h]h ]h"]h$]h&]uh1hhj;ubj)}(h FALSE (host) h]j)}(h FALSE (host)h]h FALSE (host)}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj;ubah}(h]h ]h"]h$]h&]uh1hhj;ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhj;ubah}(h]h ]h"]h$]h&]uh1j hhhMhj;ubeh}(h]h ]h"]h$]h&]uh1hhj;ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(haccept_local - BOOLEAN Accept packets with local source addresses. In combination with suitable routing, this can be used to direct packets between two local interfaces over the wire and have them accepted properly. default FALSE h](h)}(haccept_local - BOOLEANh]haccept_local - BOOLEAN}(hj)<hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj%<ubh)}(hhh]j)}(hAccept packets with local source addresses. In combination with suitable routing, this can be used to direct packets between two local interfaces over the wire and have them accepted properly. default FALSEh]hAccept packets with local source addresses. In combination with suitable routing, this can be used to direct packets between two local interfaces over the wire and have them accepted properly. default FALSE}(hj:<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj7<ubah}(h]h ]h"]h$]h&]uh1hhj%<ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hroute_localnet - BOOLEAN Do not consider loopback addresses as martian source or destination while routing. This enables the use of 127/8 for local routing purposes. default FALSE h](h)}(hroute_localnet - BOOLEANh]hroute_localnet - BOOLEAN}(hjX<hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjT<ubh)}(hhh](j)}(hDo not consider loopback addresses as martian source or destination while routing. This enables the use of 127/8 for local routing purposes.h]hDo not consider loopback addresses as martian source or destination while routing. This enables the use of 127/8 for local routing purposes.}(hji<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjf<ubj)}(h default FALSEh]h default FALSE}(hjw<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjf<ubeh}(h]h ]h"]h$]h&]uh1hhjT<ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hXxrp_filter - INTEGER - 0 - No source validation. - 1 - Strict mode as defined in RFC3704 Strict Reverse Path Each incoming packet is tested against the FIB and if the interface is not the best reverse path the packet check will fail. By default failed packets are discarded. - 2 - Loose mode as defined in RFC3704 Loose Reverse Path Each incoming packet's source address is also tested against the FIB and if the source address is not reachable via any interface the packet check will fail. Current recommended practice in RFC3704 is to enable strict mode to prevent IP spoofing from DDos attacks. If using asymmetric routing or other complicated routing, then loose mode is recommended. The max value from conf/{all,interface}/rp_filter is used when doing source validation on the {interface}. Default value is 0. Note that some distributions enable it in startup scripts. h](h)}(hrp_filter - INTEGERh]hrp_filter - INTEGER}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj<ubh)}(hhh](h)}(hhh](j)}(h0 - No source validation.h]j)}(hj<h]h0 - No source validation.}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj<ubah}(h]h ]h"]h$]h&]uh1hhj<ubj)}(h1 - Strict mode as defined in RFC3704 Strict Reverse Path Each incoming packet is tested against the FIB and if the interface is not the best reverse path the packet check will fail. By default failed packets are discarded.h]j)}(h1 - Strict mode as defined in RFC3704 Strict Reverse Path Each incoming packet is tested against the FIB and if the interface is not the best reverse path the packet check will fail. By default failed packets are discarded.h]h1 - Strict mode as defined in RFC3704 Strict Reverse Path Each incoming packet is tested against the FIB and if the interface is not the best reverse path the packet check will fail. By default failed packets are discarded.}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj<ubah}(h]h ]h"]h$]h&]uh1hhj<ubj)}(h2 - Loose mode as defined in RFC3704 Loose Reverse Path Each incoming packet's source address is also tested against the FIB and if the source address is not reachable via any interface the packet check will fail. h]j)}(h2 - Loose mode as defined in RFC3704 Loose Reverse Path Each incoming packet's source address is also tested against the FIB and if the source address is not reachable via any interface the packet check will fail.h]h2 - Loose mode as defined in RFC3704 Loose Reverse Path Each incoming packet’s source address is also tested against the FIB and if the source address is not reachable via any interface the packet check will fail.}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj<ubah}(h]h ]h"]h$]h&]uh1hhj<ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhj<ubj)}(hCurrent recommended practice in RFC3704 is to enable strict mode to prevent IP spoofing from DDos attacks. If using asymmetric routing or other complicated routing, then loose mode is recommended.h]hCurrent recommended practice in RFC3704 is to enable strict mode to prevent IP spoofing from DDos attacks. If using asymmetric routing or other complicated routing, then loose mode is recommended.}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj<ubj)}(hjThe max value from conf/{all,interface}/rp_filter is used when doing source validation on the {interface}.h]hjThe max value from conf/{all,interface}/rp_filter is used when doing source validation on the {interface}.}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj<ubj)}(hNDefault value is 0. Note that some distributions enable it in startup scripts.h]hNDefault value is 0. Note that some distributions enable it in startup scripts.}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj<ubeh}(h]h ]h"]h$]h&]uh1hhj<ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hXsrc_valid_mark - BOOLEAN - 0 - The fwmark of the packet is not included in reverse path route lookup. This allows for asymmetric routing configurations utilizing the fwmark in only one direction, e.g., transparent proxying. - 1 - The fwmark of the packet is included in reverse path route lookup. This permits rp_filter to function when the fwmark is used for routing traffic in both directions. This setting also affects the utilization of fmwark when performing source address selection for ICMP replies, or determining addresses stored for the IPOPT_TS_TSANDADDR and IPOPT_RR IP options. The max value from conf/{all,interface}/src_valid_mark is used. Default value is 0. h](h)}(hsrc_valid_mark - BOOLEANh]hsrc_valid_mark - BOOLEAN}(hj0=hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj,=ubh)}(hhh](h)}(hhh](j)}(h0 - The fwmark of the packet is not included in reverse path route lookup. This allows for asymmetric routing configurations utilizing the fwmark in only one direction, e.g., transparent proxying. h]j)}(h0 - The fwmark of the packet is not included in reverse path route lookup. This allows for asymmetric routing configurations utilizing the fwmark in only one direction, e.g., transparent proxying.h]h0 - The fwmark of the packet is not included in reverse path route lookup. This allows for asymmetric routing configurations utilizing the fwmark in only one direction, e.g., transparent proxying.}(hjH=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjD=ubah}(h]h ]h"]h$]h&]uh1hhjA=ubj)}(h1 - The fwmark of the packet is included in reverse path route lookup. This permits rp_filter to function when the fwmark is used for routing traffic in both directions. h]j)}(h1 - The fwmark of the packet is included in reverse path route lookup. This permits rp_filter to function when the fwmark is used for routing traffic in both directions.h]h1 - The fwmark of the packet is included in reverse path route lookup. This permits rp_filter to function when the fwmark is used for routing traffic in both directions.}(hj`=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj\=ubah}(h]h ]h"]h$]h&]uh1hhjA=ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhj>=ubj)}(hThis setting also affects the utilization of fmwark when performing source address selection for ICMP replies, or determining addresses stored for the IPOPT_TS_TSANDADDR and IPOPT_RR IP options.h]hThis setting also affects the utilization of fmwark when performing source address selection for ICMP replies, or determining addresses stored for the IPOPT_TS_TSANDADDR and IPOPT_RR IP options.}(hjz=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj>=ubj)}(h?The max value from conf/{all,interface}/src_valid_mark is used.h]h?The max value from conf/{all,interface}/src_valid_mark is used.}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj>=ubj)}(hDefault value is 0.h]hDefault value is 0.}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj>=ubeh}(h]h ]h"]h$]h&]uh1hhj,=ubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hXarp_filter - BOOLEAN - 1 - Allows you to have multiple network interfaces on the same subnet, and have the ARPs for each interface be answered based on whether or not the kernel would route a packet from the ARP'd IP out that interface (therefore you must use source based routing for this to work). In other words it allows control of which cards (usually 1) will respond to an arp request. - 0 - (default) The kernel can respond to arp requests with addresses from other interfaces. This may seem wrong but it usually makes sense, because it increases the chance of successful communication. IP addresses are owned by the complete host on Linux, not by particular interfaces. Only for more complex setups like load- balancing, does this behaviour cause problems. arp_filter for the interface will be enabled if at least one of conf/{all,interface}/arp_filter is set to TRUE, it will be disabled otherwise h](h)}(harp_filter - BOOLEANh]harp_filter - BOOLEAN}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM$hj=ubh)}(hhh](h)}(hhh](j)}(hXq1 - Allows you to have multiple network interfaces on the same subnet, and have the ARPs for each interface be answered based on whether or not the kernel would route a packet from the ARP'd IP out that interface (therefore you must use source based routing for this to work). In other words it allows control of which cards (usually 1) will respond to an arp request. h]j)}(hXp1 - Allows you to have multiple network interfaces on the same subnet, and have the ARPs for each interface be answered based on whether or not the kernel would route a packet from the ARP'd IP out that interface (therefore you must use source based routing for this to work). In other words it allows control of which cards (usually 1) will respond to an arp request.h]hXr1 - Allows you to have multiple network interfaces on the same subnet, and have the ARPs for each interface be answered based on whether or not the kernel would route a packet from the ARP’d IP out that interface (therefore you must use source based routing for this to work). In other words it allows control of which cards (usually 1) will respond to an arp request.}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj=ubah}(h]h ]h"]h$]h&]uh1hhj=ubj)}(hXs0 - (default) The kernel can respond to arp requests with addresses from other interfaces. This may seem wrong but it usually makes sense, because it increases the chance of successful communication. IP addresses are owned by the complete host on Linux, not by particular interfaces. Only for more complex setups like load- balancing, does this behaviour cause problems. h]j)}(hXr0 - (default) The kernel can respond to arp requests with addresses from other interfaces. This may seem wrong but it usually makes sense, because it increases the chance of successful communication. IP addresses are owned by the complete host on Linux, not by particular interfaces. Only for more complex setups like load- balancing, does this behaviour cause problems.h]hXr0 - (default) The kernel can respond to arp requests with addresses from other interfaces. This may seem wrong but it usually makes sense, because it increases the chance of successful communication. IP addresses are owned by the complete host on Linux, not by particular interfaces. Only for more complex setups like load- balancing, does this behaviour cause problems.}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj=ubah}(h]h ]h"]h$]h&]uh1hhj=ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhj=ubj)}(harp_filter for the interface will be enabled if at least one of conf/{all,interface}/arp_filter is set to TRUE, it will be disabled otherwiseh]harp_filter for the interface will be enabled if at least one of conf/{all,interface}/arp_filter is set to TRUE, it will be disabled otherwise}(hj=hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM"hj=ubeh}(h]h ]h"]h$]h&]uh1hhj=ubeh}(h]h ]h"]h$]h&]uh1hhhhM$hj5hhubh)}(hX<arp_announce - INTEGER Define different restriction levels for announcing the local source IP address from IP packets in ARP requests sent on interface: - 0 - (default) Use any local address, configured on any interface - 1 - Try to avoid local addresses that are not in the target's subnet for this interface. This mode is useful when target hosts reachable via this interface require the source IP address in ARP requests to be part of their logical network configured on the receiving interface. When we generate the request we will check all our subnets that include the target IP and will preserve the source address if it is from such subnet. If there is no such subnet we select source address according to the rules for level 2. - 2 - Always use the best local address for this target. In this mode we ignore the source address in the IP packet and try to select local address that we prefer for talks with the target host. Such local address is selected by looking for primary IP addresses on all our subnets on the outgoing interface that include the target IP address. If no suitable local address is found we select the first local address we have on the outgoing interface or on all other interfaces, with the hope we will receive reply for our request and even sometimes no matter the source IP address we announce. The max value from conf/{all,interface}/arp_announce is used. Increasing the restriction level gives more chance for receiving answer from the resolved target while decreasing the level announces more valid sender's information. h](h)}(harp_announce - INTEGERh]harp_announce - INTEGER}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMDhj>ubh)}(hhh](j)}(hDefine different restriction levels for announcing the local source IP address from IP packets in ARP requests sent on interface:h]hDefine different restriction levels for announcing the local source IP address from IP packets in ARP requests sent on interface:}(hj->hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM'hj*>ubh)}(hhh](j)}(h@0 - (default) Use any local address, configured on any interfaceh]j)}(hj@>h]h@0 - (default) Use any local address, configured on any interface}(hjB>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM+hj>>ubah}(h]h ]h"]h$]h&]uh1hhj;>ubj)}(hX1 - Try to avoid local addresses that are not in the target's subnet for this interface. This mode is useful when target hosts reachable via this interface require the source IP address in ARP requests to be part of their logical network configured on the receiving interface. When we generate the request we will check all our subnets that include the target IP and will preserve the source address if it is from such subnet. If there is no such subnet we select source address according to the rules for level 2.h]j)}(hX1 - Try to avoid local addresses that are not in the target's subnet for this interface. This mode is useful when target hosts reachable via this interface require the source IP address in ARP requests to be part of their logical network configured on the receiving interface. When we generate the request we will check all our subnets that include the target IP and will preserve the source address if it is from such subnet. If there is no such subnet we select source address according to the rules for level 2.h]hX1 - Try to avoid local addresses that are not in the target’s subnet for this interface. This mode is useful when target hosts reachable via this interface require the source IP address in ARP requests to be part of their logical network configured on the receiving interface. When we generate the request we will check all our subnets that include the target IP and will preserve the source address if it is from such subnet. If there is no such subnet we select source address according to the rules for level 2.}(hjY>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM,hjU>ubah}(h]h ]h"]h$]h&]uh1hhj;>ubj)}(hXO2 - Always use the best local address for this target. In this mode we ignore the source address in the IP packet and try to select local address that we prefer for talks with the target host. Such local address is selected by looking for primary IP addresses on all our subnets on the outgoing interface that include the target IP address. If no suitable local address is found we select the first local address we have on the outgoing interface or on all other interfaces, with the hope we will receive reply for our request and even sometimes no matter the source IP address we announce. h]j)}(hXN2 - Always use the best local address for this target. In this mode we ignore the source address in the IP packet and try to select local address that we prefer for talks with the target host. Such local address is selected by looking for primary IP addresses on all our subnets on the outgoing interface that include the target IP address. If no suitable local address is found we select the first local address we have on the outgoing interface or on all other interfaces, with the hope we will receive reply for our request and even sometimes no matter the source IP address we announce.h]hXN2 - Always use the best local address for this target. In this mode we ignore the source address in the IP packet and try to select local address that we prefer for talks with the target host. Such local address is selected by looking for primary IP addresses on all our subnets on the outgoing interface that include the target IP address. If no suitable local address is found we select the first local address we have on the outgoing interface or on all other interfaces, with the hope we will receive reply for our request and even sometimes no matter the source IP address we announce.}(hjq>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM5hjm>ubah}(h]h ]h"]h$]h&]uh1hhj;>ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM+hj*>ubj)}(h=The max value from conf/{all,interface}/arp_announce is used.h]h=The max value from conf/{all,interface}/arp_announce is used.}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM@hj*>ubj)}(hIncreasing the restriction level gives more chance for receiving answer from the resolved target while decreasing the level announces more valid sender's information.h]hIncreasing the restriction level gives more chance for receiving answer from the resolved target while decreasing the level announces more valid sender’s information.}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMBhj*>ubeh}(h]h ]h"]h$]h&]uh1hhj>ubeh}(h]h ]h"]h$]h&]uh1hhhhMDhj5hhubh)}(hX$arp_ignore - INTEGER Define different modes for sending replies in response to received ARP requests that resolve local target IP addresses: - 0 - (default): reply for any local target IP address, configured on any interface - 1 - reply only if the target IP address is local address configured on the incoming interface - 2 - reply only if the target IP address is local address configured on the incoming interface and both with the sender's IP address are part from same subnet on this interface - 3 - do not reply for local addresses configured with scope host, only resolutions for global and link addresses are replied - 4-7 - reserved - 8 - do not reply for all local addresses The max value from conf/{all,interface}/arp_ignore is used when ARP request is received on the {interface} h](h)}(harp_ignore - INTEGERh]harp_ignore - INTEGER}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMWhj>ubh)}(hhh](j)}(hwDefine different modes for sending replies in response to received ARP requests that resolve local target IP addresses:h]hwDefine different modes for sending replies in response to received ARP requests that resolve local target IP addresses:}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMGhj>ubh)}(hhh](j)}(hQ0 - (default): reply for any local target IP address, configured on any interfaceh]j)}(hQ0 - (default): reply for any local target IP address, configured on any interfaceh]hQ0 - (default): reply for any local target IP address, configured on any interface}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMJhj>ubah}(h]h ]h"]h$]h&]uh1hhj>ubj)}(h]1 - reply only if the target IP address is local address configured on the incoming interfaceh]j)}(h]1 - reply only if the target IP address is local address configured on the incoming interfaceh]h]1 - reply only if the target IP address is local address configured on the incoming interface}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMLhj>ubah}(h]h ]h"]h$]h&]uh1hhj>ubj)}(h2 - reply only if the target IP address is local address configured on the incoming interface and both with the sender's IP address are part from same subnet on this interfaceh]j)}(h2 - reply only if the target IP address is local address configured on the incoming interface and both with the sender's IP address are part from same subnet on this interfaceh]h2 - reply only if the target IP address is local address configured on the incoming interface and both with the sender’s IP address are part from same subnet on this interface}(hj ?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMNhj ?ubah}(h]h ]h"]h$]h&]uh1hhj>ubj)}(h{3 - do not reply for local addresses configured with scope host, only resolutions for global and link addresses are repliedh]j)}(h{3 - do not reply for local addresses configured with scope host, only resolutions for global and link addresses are repliedh]h{3 - do not reply for local addresses configured with scope host, only resolutions for global and link addresses are replied}(hj%?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMQhj!?ubah}(h]h ]h"]h$]h&]uh1hhj>ubj)}(h4-7 - reservedh]j)}(hj;?h]h4-7 - reserved}(hj=?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMShj9?ubah}(h]h ]h"]h$]h&]uh1hhj>ubj)}(h)8 - do not reply for all local addresses h]j)}(h(8 - do not reply for all local addressesh]h(8 - do not reply for all local addresses}(hjT?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMThjP?ubah}(h]h ]h"]h$]h&]uh1hhj>ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMJhj>ubj)}(hjThe max value from conf/{all,interface}/arp_ignore is used when ARP request is received on the {interface}h]hjThe max value from conf/{all,interface}/arp_ignore is used when ARP request is received on the {interface}}(hjn?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMVhj>ubeh}(h]h ]h"]h$]h&]uh1hhj>ubeh}(h]h ]h"]h$]h&]uh1hhhhMWhj5hhubh)}(hXOarp_notify - BOOLEAN Define mode for notification of address and device changes. == ========================================================== 0 (default): do nothing 1 Generate gratuitous arp requests when device is brought up or hardware address changes. == ========================================================== h](h)}(harp_notify - BOOLEANh]harp_notify - BOOLEAN}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM`hj?ubh)}(hhh](j)}(h;Define mode for notification of address and device changes.h]h;Define mode for notification of address and device changes.}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMZhj?ubj )}(h== ========================================================== 0 (default): do nothing 1 Generate gratuitous arp requests when device is brought up or hardware address changes. == ========================================================== h]j[)}(hhh]j`)}(hhh](je)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhj?ubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthK:uh1jdhj?ubj{)}(hhh](j)}(hhh](j)}(hhh]j)}(hjh]h0}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM]hj?ubah}(h]h ]h"]h$]h&]uh1jhj?ubj)}(hhh]j)}(h(default): do nothingh]h(default): do nothing}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM]hj?ubah}(h]h ]h"]h$]h&]uh1jhj?ubeh}(h]h ]h"]h$]h&]uh1jhj?ubj)}(hhh](j)}(hhh]j)}(hjh]h1}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM^hj@ubah}(h]h ]h"]h$]h&]uh1jhj@ubj)}(hhh]j)}(hWGenerate gratuitous arp requests when device is brought up or hardware address changes.h]hWGenerate gratuitous arp requests when device is brought up or hardware address changes.}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM^hj@ubah}(h]h ]h"]h$]h&]uh1jhj@ubeh}(h]h ]h"]h$]h&]uh1jhj?ubeh}(h]h ]h"]h$]h&]uh1jzhj?ubeh}(h]h ]h"]h$]h&]colsKuh1j_hj?ubah}(h]h ]h"]h$]h&]uh1jZhj?ubah}(h]h ]h"]h$]h&]uh1j hhhM\hj?ubeh}(h]h ]h"]h$]h&]uh1hhj?ubeh}(h]h ]h"]h$]h&]uh1hhhhM`hj5hhubh)}(hXarp_accept - INTEGER Define behavior for accepting gratuitous ARP (garp) frames from devices that are not already present in the ARP table: - 0 - don't create new entries in the ARP table - 1 - create new entries in the ARP table - 2 - create new entries only if the source IP address is in the same subnet as an address configured on the interface that received the garp message. Both replies and requests type gratuitous arp will trigger the ARP table to be updated, if this setting is on. If the ARP table already contains the IP address of the gratuitous arp frame, the arp table will be updated regardless if this setting is on or off. h](h)}(harp_accept - INTEGERh]harp_accept - INTEGER}(hja@hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMqhj]@ubh)}(hhh](j)}(hvDefine behavior for accepting gratuitous ARP (garp) frames from devices that are not already present in the ARP table:h]hvDefine behavior for accepting gratuitous ARP (garp) frames from devices that are not already present in the ARP table:}(hjr@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMchjo@ubh)}(hhh](j)}(h-0 - don't create new entries in the ARP tableh]j)}(hj@h]h/0 - don’t create new entries in the ARP table}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMfhj@ubah}(h]h ]h"]h$]h&]uh1hhj@ubj)}(h'1 - create new entries in the ARP tableh]j)}(hj@h]h'1 - create new entries in the ARP table}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMghj@ubah}(h]h ]h"]h$]h&]uh1hhj@ubj)}(h2 - create new entries only if the source IP address is in the same subnet as an address configured on the interface that received the garp message. h]j)}(h2 - create new entries only if the source IP address is in the same subnet as an address configured on the interface that received the garp message.h]h2 - create new entries only if the source IP address is in the same subnet as an address configured on the interface that received the garp message.}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhhj@ubah}(h]h ]h"]h$]h&]uh1hhj@ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMfhjo@ubj)}(hnBoth replies and requests type gratuitous arp will trigger the ARP table to be updated, if this setting is on.h]hnBoth replies and requests type gratuitous arp will trigger the ARP table to be updated, if this setting is on.}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMlhjo@ubj)}(hIf the ARP table already contains the IP address of the gratuitous arp frame, the arp table will be updated regardless if this setting is on or off.h]hIf the ARP table already contains the IP address of the gratuitous arp frame, the arp table will be updated regardless if this setting is on or off.}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMohjo@ubeh}(h]h ]h"]h$]h&]uh1hhj]@ubeh}(h]h ]h"]h$]h&]uh1hhhhMqhj5hhubh)}(hXxarp_evict_nocarrier - BOOLEAN Clears the ARP cache on NOCARRIER events. This option is important for wireless devices where the ARP cache should not be cleared when roaming between access points on the same network. In most cases this should remain as the default (1). - 1 - (default): Clear the ARP cache on NOCARRIER events - 0 - Do not clear ARP cache on NOCARRIER events h](h)}(harp_evict_nocarrier - BOOLEANh]harp_evict_nocarrier - BOOLEAN}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMzhj@ubh)}(hhh](j)}(hClears the ARP cache on NOCARRIER events. This option is important for wireless devices where the ARP cache should not be cleared when roaming between access points on the same network. In most cases this should remain as the default (1).h]hClears the ARP cache on NOCARRIER events. This option is important for wireless devices where the ARP cache should not be cleared when roaming between access points on the same network. In most cases this should remain as the default (1).}(hj AhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMthj Aubh)}(hhh](j)}(h61 - (default): Clear the ARP cache on NOCARRIER eventsh]j)}(hjAh]h61 - (default): Clear the ARP cache on NOCARRIER events}(hj!AhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMyhjAubah}(h]h ]h"]h$]h&]uh1hhjAubj)}(h/0 - Do not clear ARP cache on NOCARRIER events h]j)}(h.0 - Do not clear ARP cache on NOCARRIER eventsh]h.0 - Do not clear ARP cache on NOCARRIER events}(hj8AhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMzhj4Aubah}(h]h ]h"]h$]h&]uh1hhjAubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMyhj Aubeh}(h]h ]h"]h$]h&]uh1hhj@ubeh}(h]h ]h"]h$]h&]uh1hhhhMzhj5hhubh)}(hmcast_solicit - INTEGER The maximum number of multicast probes in INCOMPLETE state, when the associated hardware address is unknown. Defaults to 3. h](h)}(hmcast_solicit - INTEGERh]hmcast_solicit - INTEGER}(hjbAhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj^Aubh)}(hhh]j)}(h|The maximum number of multicast probes in INCOMPLETE state, when the associated hardware address is unknown. Defaults to 3.h]h|The maximum number of multicast probes in INCOMPLETE state, when the associated hardware address is unknown. Defaults to 3.}(hjsAhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM}hjpAubah}(h]h ]h"]h$]h&]uh1hhj^Aubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hucast_solicit - INTEGER The maximum number of unicast probes in PROBE state, when the hardware address is being reconfirmed. Defaults to 3. h](h)}(hucast_solicit - INTEGERh]hucast_solicit - INTEGER}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjAubh)}(hhh]j)}(htThe maximum number of unicast probes in PROBE state, when the hardware address is being reconfirmed. Defaults to 3.h]htThe maximum number of unicast probes in PROBE state, when the hardware address is being reconfirmed. Defaults to 3.}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjAubah}(h]h ]h"]h$]h&]uh1hhjAubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(happ_solicit - INTEGER The maximum number of probes to send to the user space ARP daemon via netlink before dropping back to multicast probes (see mcast_resolicit). Defaults to 0. h](h)}(happ_solicit - INTEGERh]happ_solicit - INTEGER}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjAubh)}(hhh]j)}(hThe maximum number of probes to send to the user space ARP daemon via netlink before dropping back to multicast probes (see mcast_resolicit). Defaults to 0.h]hThe maximum number of probes to send to the user space ARP daemon via netlink before dropping back to multicast probes (see mcast_resolicit). Defaults to 0.}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjAubah}(h]h ]h"]h$]h&]uh1hhjAubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(h~mcast_resolicit - INTEGER The maximum number of multicast probes after unicast and app probes in PROBE state. Defaults to 0. h](h)}(hmcast_resolicit - INTEGERh]hmcast_resolicit - INTEGER}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjAubh)}(hhh]j)}(hcThe maximum number of multicast probes after unicast and app probes in PROBE state. Defaults to 0.h]hcThe maximum number of multicast probes after unicast and app probes in PROBE state. Defaults to 0.}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjAubah}(h]h ]h"]h$]h&]uh1hhjAubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hGdisable_policy - BOOLEAN Disable IPSEC policy (SPD) for this interface h](h)}(hdisable_policy - BOOLEANh]hdisable_policy - BOOLEAN}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjBubh)}(hhh]j)}(h-Disable IPSEC policy (SPD) for this interfaceh]h-Disable IPSEC policy (SPD) for this interface}(hj/BhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj,Bubah}(h]h ]h"]h$]h&]uh1hhjBubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hWdisable_xfrm - BOOLEAN Disable IPSEC encryption on this interface, whatever the policy h](h)}(hdisable_xfrm - BOOLEANh]hdisable_xfrm - BOOLEAN}(hjMBhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjIBubh)}(hhh]j)}(h?Disable IPSEC encryption on this interface, whatever the policyh]h?Disable IPSEC encryption on this interface, whatever the policy}(hj^BhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj[Bubah}(h]h ]h"]h$]h&]uh1hhjIBubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(higmpv2_unsolicited_report_interval - INTEGER The interval in milliseconds in which the next unsolicited IGMPv1 or IGMPv2 report retransmit will take place. Default: 10000 (10 seconds) h](h)}(h,igmpv2_unsolicited_report_interval - INTEGERh]h,igmpv2_unsolicited_report_interval - INTEGER}(hj|BhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjxBubh)}(hhh](j)}(hnThe interval in milliseconds in which the next unsolicited IGMPv1 or IGMPv2 report retransmit will take place.h]hnThe interval in milliseconds in which the next unsolicited IGMPv1 or IGMPv2 report retransmit will take place.}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjBubj)}(hDefault: 10000 (10 seconds)h]hDefault: 10000 (10 seconds)}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjBubeh}(h]h ]h"]h$]h&]uh1hhjxBubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(higmpv3_unsolicited_report_interval - INTEGER The interval in milliseconds in which the next unsolicited IGMPv3 report retransmit will take place. Default: 1000 (1 seconds) h](h)}(h,igmpv3_unsolicited_report_interval - INTEGERh]h,igmpv3_unsolicited_report_interval - INTEGER}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjBubh)}(hhh](j)}(hdThe interval in milliseconds in which the next unsolicited IGMPv3 report retransmit will take place.h]hdThe interval in milliseconds in which the next unsolicited IGMPv3 report retransmit will take place.}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjBubj)}(hDefault: 1000 (1 seconds)h]hDefault: 1000 (1 seconds)}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjBubeh}(h]h ]h"]h$]h&]uh1hhjBubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(heignore_routes_with_linkdown - BOOLEAN Ignore routes whose link is down when performing a FIB lookup. h](h)}(h%ignore_routes_with_linkdown - BOOLEANh]h%ignore_routes_with_linkdown - BOOLEAN}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjBubh)}(hhh]j)}(h>Ignore routes whose link is down when performing a FIB lookup.h]h>Ignore routes whose link is down when performing a FIB lookup.}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjCubah}(h]h ]h"]h$]h&]uh1hhjBubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hpromote_secondaries - BOOLEAN When a primary IP address is removed from this interface promote a corresponding secondary IP address instead of removing all the corresponding secondary IP addresses. h](h)}(hpromote_secondaries - BOOLEANh]hpromote_secondaries - BOOLEAN}(hj%ChhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj!Cubh)}(hhh]j)}(hWhen a primary IP address is removed from this interface promote a corresponding secondary IP address instead of removing all the corresponding secondary IP addresses.h]hWhen a primary IP address is removed from this interface promote a corresponding secondary IP address instead of removing all the corresponding secondary IP addresses.}(hj6ChhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3Cubah}(h]h ]h"]h$]h&]uh1hhj!Cubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hX drop_unicast_in_l2_multicast - BOOLEAN Drop any unicast IP packets that are received in link-layer multicast (or broadcast) frames. This behavior (for multicast) is actually a SHOULD in RFC 1122, but is disabled by default for compatibility reasons. Default: off (0) h](h)}(h&drop_unicast_in_l2_multicast - BOOLEANh]h&drop_unicast_in_l2_multicast - BOOLEAN}(hjTChhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjPCubh)}(hhh](j)}(h\Drop any unicast IP packets that are received in link-layer multicast (or broadcast) frames.h]h\Drop any unicast IP packets that are received in link-layer multicast (or broadcast) frames.}(hjeChhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjbCubj)}(huThis behavior (for multicast) is actually a SHOULD in RFC 1122, but is disabled by default for compatibility reasons.h]huThis behavior (for multicast) is actually a SHOULD in RFC 1122, but is disabled by default for compatibility reasons.}(hjsChhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjbCubj)}(hDefault: off (0)h]hDefault: off (0)}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjbCubeh}(h]h ]h"]h$]h&]uh1hhjPCubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(hdrop_gratuitous_arp - BOOLEAN Drop all gratuitous ARP frames, for example if there's a known good ARP proxy on the network and such frames need not be used (or in the case of 802.11, must not be used to prevent attacks.) Default: off (0) h](h)}(hdrop_gratuitous_arp - BOOLEANh]hdrop_gratuitous_arp - BOOLEAN}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjCubh)}(hhh](j)}(hDrop all gratuitous ARP frames, for example if there's a known good ARP proxy on the network and such frames need not be used (or in the case of 802.11, must not be used to prevent attacks.)h]hDrop all gratuitous ARP frames, for example if there’s a known good ARP proxy on the network and such frames need not be used (or in the case of 802.11, must not be used to prevent attacks.)}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjCubj)}(hDefault: off (0)h]hDefault: off (0)}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjCubeh}(h]h ]h"]h$]h&]uh1hhjCubeh}(h]h ]h"]h$]h&]uh1hhhhMhj5hhubh)}(h`tag - INTEGER Allows you to write a number, which can be used as required. Default value is 0. h](h)}(h tag - INTEGERh]h tag - INTEGER}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjCubh)}(hhh](j)}(h0 - Layer 3 (source and destination addresses plus flow label)h]j)}(hjHh]h>0 - Layer 3 (source and destination addresses plus flow label)}(hjHhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM+hjHubah}(h]h ]h"]h$]h&]uh1hhjHubj)}(h1 - Layer 4 (standard 5-tuple)h]j)}(hjHh]h1 - Layer 4 (standard 5-tuple)}(hjHhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM,hjHubah}(h]h ]h"]h$]h&]uh1hhjHubj)}(h'2 - Layer 3 or inner Layer 3 if presenth]j)}(hjIh]h'2 - Layer 3 or inner Layer 3 if present}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM-hj Iubah}(h]h ]h"]h$]h&]uh1hhjHubj)}(hy3 - Custom multipath hash. Fields used for multipath hash calculation are determined by fib_multipath_hash_fields sysctl h]j)}(hx3 - Custom multipath hash. Fields used for multipath hash calculation are determined by fib_multipath_hash_fields sysctlh]hx3 - Custom multipath hash. Fields used for multipath hash calculation are determined by fib_multipath_hash_fields sysctl}(hj(IhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM.hj$Iubah}(h]h ]h"]h$]h&]uh1hhjHubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM+hjHubeh}(h]h ]h"]h$]h&]uh1hhjHubeh}(h]h ]h"]h$]h&]uh1hhhhM/hj3Ehhubh)}(hXfib_multipath_hash_fields - UNSIGNED INTEGER When fib_multipath_hash_policy is set to 3 (custom multipath hash), the fields used for multipath hash calculation are determined by this sysctl. This value is a bitmask which enables various fields for multipath hash calculation. Possible fields are: ====== ============================ 0x0001 Source IP address 0x0002 Destination IP address 0x0004 IP protocol 0x0008 Flow Label 0x0010 Source port 0x0020 Destination port 0x0040 Inner source IP address 0x0080 Inner destination IP address 0x0100 Inner IP protocol 0x0200 Inner Flow Label 0x0400 Inner source port 0x0800 Inner destination port ====== ============================ Default: 0x0007 (source IP, destination IP and IP protocol) h](h)}(h,fib_multipath_hash_fields - UNSIGNED INTEGERh]h,fib_multipath_hash_fields - UNSIGNED INTEGER}(hjRIhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMJhjNIubh)}(hhh](j)}(hWhen fib_multipath_hash_policy is set to 3 (custom multipath hash), the fields used for multipath hash calculation are determined by this sysctl.h]hWhen fib_multipath_hash_policy is set to 3 (custom multipath hash), the fields used for multipath hash calculation are determined by this sysctl.}(hjcIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM2hj`Iubj)}(hTThis value is a bitmask which enables various fields for multipath hash calculation.h]hTThis value is a bitmask which enables various fields for multipath hash calculation.}(hjqIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM6hj`Iubj)}(hPossible fields are:h]hPossible fields are:}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM9hj`Iubj[)}(hhh]j`)}(hhh](je)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjIubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjIubj{)}(hhh](j)}(hhh](j)}(hhh]j)}(h0x0001h]h0x0001}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM<hjIubah}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh]j)}(hSource IP addressh]hSource IP address}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM<hjIubah}(h]h ]h"]h$]h&]uh1jhjIubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0002h]h0x0002}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM=hjIubah}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh]j)}(hDestination IP addressh]hDestination IP address}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM=hjIubah}(h]h ]h"]h$]h&]uh1jhjIubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0004h]h0x0004}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM>hjJubah}(h]h ]h"]h$]h&]uh1jhjJubj)}(hhh]j)}(h IP protocolh]h IP protocol}(hj5JhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM>hj2Jubah}(h]h ]h"]h$]h&]uh1jhjJubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0008h]h0x0008}(hjUJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM?hjRJubah}(h]h ]h"]h$]h&]uh1jhjOJubj)}(hhh]j)}(h Flow Labelh]h Flow Label}(hjlJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM?hjiJubah}(h]h ]h"]h$]h&]uh1jhjOJubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0010h]h0x0010}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM@hjJubah}(h]h ]h"]h$]h&]uh1jhjJubj)}(hhh]j)}(h Source porth]h Source port}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM@hjJubah}(h]h ]h"]h$]h&]uh1jhjJubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0020h]h0x0020}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMAhjJubah}(h]h ]h"]h$]h&]uh1jhjJubj)}(hhh]j)}(hDestination porth]hDestination port}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMAhjJubah}(h]h ]h"]h$]h&]uh1jhjJubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0040h]h0x0040}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMBhjJubah}(h]h ]h"]h$]h&]uh1jhjJubj)}(hhh]j)}(hInner source IP addressh]hInner source IP address}(hjKhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMBhjKubah}(h]h ]h"]h$]h&]uh1jhjJubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0080h]h0x0080}(hj1KhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMChj.Kubah}(h]h ]h"]h$]h&]uh1jhj+Kubj)}(hhh]j)}(hInner destination IP addressh]hInner destination IP address}(hjHKhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMChjEKubah}(h]h ]h"]h$]h&]uh1jhj+Kubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0100h]h0x0100}(hjhKhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMDhjeKubah}(h]h ]h"]h$]h&]uh1jhjbKubj)}(hhh]j)}(hInner IP protocolh]hInner IP protocol}(hjKhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMDhj|Kubah}(h]h ]h"]h$]h&]uh1jhjbKubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0200h]h0x0200}(hjKhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMEhjKubah}(h]h ]h"]h$]h&]uh1jhjKubj)}(hhh]j)}(hInner Flow Labelh]hInner Flow Label}(hjKhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMEhjKubah}(h]h ]h"]h$]h&]uh1jhjKubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0400h]h0x0400}(hjKhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMFhjKubah}(h]h ]h"]h$]h&]uh1jhjKubj)}(hhh]j)}(hInner source porth]hInner source port}(hjKhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMFhjKubah}(h]h ]h"]h$]h&]uh1jhjKubeh}(h]h ]h"]h$]h&]uh1jhjIubj)}(hhh](j)}(hhh]j)}(h0x0800h]h0x0800}(hj LhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMGhj Lubah}(h]h ]h"]h$]h&]uh1jhjLubj)}(hhh]j)}(hInner destination porth]hInner destination port}(hj$LhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMGhj!Lubah}(h]h ]h"]h$]h&]uh1jhjLubeh}(h]h ]h"]h$]h&]uh1jhjIubeh}(h]h ]h"]h$]h&]uh1jzhjIubeh}(h]h ]h"]h$]h&]colsKuh1j_hjIubah}(h]h ]h"]h$]h&]uh1jZhj`Iubj)}(h;Default: 0x0007 (source IP, destination IP and IP protocol)h]h;Default: 0x0007 (source IP, destination IP and IP protocol)}(hjQLhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMJhj`Iubeh}(h]h ]h"]h$]h&]uh1hhjNIubeh}(h]h ]h"]h$]h&]uh1hhhhMJhj3Ehhubh)}(hanycast_src_echo_reply - BOOLEAN Controls the use of anycast addresses as source addresses for ICMPv6 echo reply - TRUE: enabled - FALSE: disabled Default: FALSE h](h)}(h anycast_src_echo_reply - BOOLEANh]h anycast_src_echo_reply - BOOLEAN}(hjoLhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMShjkLubh)}(hhh](j)}(hOControls the use of anycast addresses as source addresses for ICMPv6 echo replyh]hOControls the use of anycast addresses as source addresses for ICMPv6 echo reply}(hjLhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMMhj}Lubh)}(hhh](j)}(hTRUE: enabledh]j)}(hjLh]hTRUE: enabled}(hjLhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMPhjLubah}(h]h ]h"]h$]h&]uh1hhjLubj)}(hFALSE: disabled h]j)}(hFALSE: disabledh]hFALSE: disabled}(hjLhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMQhjLubah}(h]h ]h"]h$]h&]uh1hhjLubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMPhj}Lubj)}(hDefault: FALSEh]hDefault: FALSE}(hjLhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMShj}Lubeh}(h]h ]h"]h$]h&]uh1hhjkLubeh}(h]h ]h"]h$]h&]uh1hhhhMShj3Ehhubh)}(hidgen_delay - INTEGER Controls the delay in seconds after which time to retry privacy stable address generation if a DAD conflict is detected. Default: 1 (as specified in RFC7217) h](h)}(hidgen_delay - INTEGERh]hidgen_delay - INTEGER}(hjLhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMZhjLubh)}(hhh](j)}(hxControls the delay in seconds after which time to retry privacy stable address generation if a DAD conflict is detected.h]hxControls the delay in seconds after which time to retry privacy stable address generation if a DAD conflict is detected.}(hjLhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMVhjLubj)}(h$Default: 1 (as specified in RFC7217)h]h$Default: 1 (as specified in RFC7217)}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMZhjLubeh}(h]h ]h"]h$]h&]uh1hhjLubeh}(h]h ]h"]h$]h&]uh1hhhhMZhj3Ehhubh)}(hidgen_retries - INTEGER Controls the number of retries to generate a stable privacy address if a DAD conflict is detected. Default: 3 (as specified in RFC7217) h](h)}(hidgen_retries - INTEGERh]hidgen_retries - INTEGER}(hj!MhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM`hjMubh)}(hhh](j)}(hbControls the number of retries to generate a stable privacy address if a DAD conflict is detected.h]hbControls the number of retries to generate a stable privacy address if a DAD conflict is detected.}(hj2MhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM]hj/Mubj)}(h$Default: 3 (as specified in RFC7217)h]h$Default: 3 (as specified in RFC7217)}(hj@MhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM`hj/Mubeh}(h]h ]h"]h$]h&]uh1hhjMubeh}(h]h ]h"]h$]h&]uh1hhhhM`hj3Ehhubh)}(hmld_qrv - INTEGER Controls the MLD query robustness variable (see RFC3810 9.1). Default: 2 (as specified by RFC3810 9.1) Minimum: 1 (as specified by RFC6636 4.5) h](h)}(hmld_qrv - INTEGERh]hmld_qrv - INTEGER}(hj^MhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMghjZMubh)}(hhh](j)}(h=Controls the MLD query robustness variable (see RFC3810 9.1).h]h=Controls the MLD query robustness variable (see RFC3810 9.1).}(hjoMhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMchjlMubj)}(h(Default: 2 (as specified by RFC3810 9.1)h]h(Default: 2 (as specified by RFC3810 9.1)}(hj}MhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMehjlMubj)}(h(Minimum: 1 (as specified by RFC6636 4.5)h]h(Minimum: 1 (as specified by RFC6636 4.5)}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMghjlMubeh}(h]h ]h"]h$]h&]uh1hhjZMubeh}(h]h ]h"]h$]h&]uh1hhhhMghj3Ehhubh)}(hXmax_dst_opts_number - INTEGER Maximum number of non-padding TLVs allowed in a Destination options extension header. If this value is less than zero then unknown options are disallowed and the number of known TLVs allowed is the absolute value of this number. Default: 8 h](h)}(hmax_dst_opts_number - INTEGERh]hmax_dst_opts_number - INTEGER}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMohjMubh)}(hhh](j)}(hMaximum number of non-padding TLVs allowed in a Destination options extension header. If this value is less than zero then unknown options are disallowed and the number of known TLVs allowed is the absolute value of this number.h]hMaximum number of non-padding TLVs allowed in a Destination options extension header. If this value is less than zero then unknown options are disallowed and the number of known TLVs allowed is the absolute value of this number.}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMjhjMubj)}(h Default: 8h]h Default: 8}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMohjMubeh}(h]h ]h"]h$]h&]uh1hhjMubeh}(h]h ]h"]h$]h&]uh1hhhhMohj3Ehhubh)}(hXmax_hbh_opts_number - INTEGER Maximum number of non-padding TLVs allowed in a Hop-by-Hop options extension header. If this value is less than zero then unknown options are disallowed and the number of known TLVs allowed is the absolute value of this number. Default: 8 h](h)}(hmax_hbh_opts_number - INTEGERh]hmax_hbh_opts_number - INTEGER}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMwhjMubh)}(hhh](j)}(hMaximum number of non-padding TLVs allowed in a Hop-by-Hop options extension header. If this value is less than zero then unknown options are disallowed and the number of known TLVs allowed is the absolute value of this number.h]hMaximum number of non-padding TLVs allowed in a Hop-by-Hop options extension header. If this value is less than zero then unknown options are disallowed and the number of known TLVs allowed is the absolute value of this number.}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMrhjMubj)}(h Default: 8h]h Default: 8}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMwhjMubeh}(h]h ]h"]h$]h&]uh1hhjMubeh}(h]h ]h"]h$]h&]uh1hhhhMwhj3Ehhubh)}(hmax_dst_opts_length - INTEGER Maximum length allowed for a Destination options extension header. Default: INT_MAX (unlimited) h](h)}(hmax_dst_opts_length - INTEGERh]hmax_dst_opts_length - INTEGER}(hj#NhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM}hjNubh)}(hhh](j)}(hBMaximum length allowed for a Destination options extension header.h]hBMaximum length allowed for a Destination options extension header.}(hj4NhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMzhj1Nubj)}(hDefault: INT_MAX (unlimited)h]hDefault: INT_MAX (unlimited)}(hjBNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM}hj1Nubeh}(h]h ]h"]h$]h&]uh1hhjNubeh}(h]h ]h"]h$]h&]uh1hhhhM}hj3Ehhubh)}(hymax_hbh_length - INTEGER Maximum length allowed for a Hop-by-Hop options extension header. Default: INT_MAX (unlimited) h](h)}(hmax_hbh_length - INTEGERh]hmax_hbh_length - INTEGER}(hj`NhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj\Nubh)}(hhh](j)}(hAMaximum length allowed for a Hop-by-Hop options extension header.h]hAMaximum length allowed for a Hop-by-Hop options extension header.}(hjqNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjnNubj)}(hDefault: INT_MAX (unlimited)h]hDefault: INT_MAX (unlimited)}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjnNubeh}(h]h ]h"]h$]h&]uh1hhj\Nubeh}(h]h ]h"]h$]h&]uh1hhhhMhj3Ehhubh)}(hXskip_notify_on_dev_down - BOOLEAN Controls whether an RTM_DELROUTE message is generated for routes removed when a device is taken down or deleted. IPv4 does not generate this message; IPv6 does by default. Setting this sysctl to true skips the message, making IPv4 and IPv6 on par in relying on userspace caches to track link events and evict routes. Default: false (generate message) h](h)}(h!skip_notify_on_dev_down - BOOLEANh]h!skip_notify_on_dev_down - BOOLEAN}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjNubh)}(hhh](j)}(hX<Controls whether an RTM_DELROUTE message is generated for routes removed when a device is taken down or deleted. IPv4 does not generate this message; IPv6 does by default. Setting this sysctl to true skips the message, making IPv4 and IPv6 on par in relying on userspace caches to track link events and evict routes.h]hX<Controls whether an RTM_DELROUTE message is generated for routes removed when a device is taken down or deleted. IPv4 does not generate this message; IPv6 does by default. Setting this sysctl to true skips the message, making IPv4 and IPv6 on par in relying on userspace caches to track link events and evict routes.}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjNubj)}(h!Default: false (generate message)h]h!Default: false (generate message)}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjNubeh}(h]h ]h"]h$]h&]uh1hhjNubeh}(h]h ]h"]h$]h&]uh1hhhhMhj3Ehhubh)}(hXnexthop_compat_mode - BOOLEAN New nexthop API provides a means for managing nexthops independent of prefixes. Backwards compatibility with old route format is enabled by default which means route dumps and notifications contain the new nexthop attribute but also the full, expanded nexthop definition. Further, updates or deletes of a nexthop configuration generate route notifications for each fib entry using the nexthop. Once a system understands the new API, this sysctl can be disabled to achieve full performance benefits of the new API by disabling the nexthop expansion and extraneous notifications. Note that as a backward-compatible mode, dumping of modern features might be incomplete or wrong. For example, resilient groups will not be shown as such, but rather as just a list of next hops. Also weights that do not fit into 8 bits will show incorrectly. Default: true (backward compat mode) h](h)}(hnexthop_compat_mode - BOOLEANh]hnexthop_compat_mode - BOOLEAN}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjNubh)}(hhh](j)}(hXANew nexthop API provides a means for managing nexthops independent of prefixes. Backwards compatibility with old route format is enabled by default which means route dumps and notifications contain the new nexthop attribute but also the full, expanded nexthop definition. Further, updates or deletes of a nexthop configuration generate route notifications for each fib entry using the nexthop. Once a system understands the new API, this sysctl can be disabled to achieve full performance benefits of the new API by disabling the nexthop expansion and extraneous notifications.h]hXANew nexthop API provides a means for managing nexthops independent of prefixes. Backwards compatibility with old route format is enabled by default which means route dumps and notifications contain the new nexthop attribute but also the full, expanded nexthop definition. Further, updates or deletes of a nexthop configuration generate route notifications for each fib entry using the nexthop. Once a system understands the new API, this sysctl can be disabled to achieve full performance benefits of the new API by disabling the nexthop expansion and extraneous notifications.}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjNubj)}(hXNote that as a backward-compatible mode, dumping of modern features might be incomplete or wrong. For example, resilient groups will not be shown as such, but rather as just a list of next hops. Also weights that do not fit into 8 bits will show incorrectly.h]hXNote that as a backward-compatible mode, dumping of modern features might be incomplete or wrong. For example, resilient groups will not be shown as such, but rather as just a list of next hops. Also weights that do not fit into 8 bits will show incorrectly.}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjNubj)}(h$Default: true (backward compat mode)h]h$Default: true (backward compat mode)}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjNubeh}(h]h ]h"]h$]h&]uh1hhjNubeh}(h]h ]h"]h$]h&]uh1hhhhMhj3Ehhubh)}(hX?fib_notify_on_flag_change - INTEGER Whether to emit RTM_NEWROUTE notifications whenever RTM_F_OFFLOAD/ RTM_F_TRAP/RTM_F_OFFLOAD_FAILED flags are changed. After installing a route to the kernel, user space receives an acknowledgment, which means the route was installed in the kernel, but not necessarily in hardware. It is also possible for a route already installed in hardware to change its action and therefore its flags. For example, a host route that is trapping packets can be "promoted" to perform decapsulation following the installation of an IPinIP/VXLAN tunnel. The notifications will indicate to user-space the state of the route. Default: 0 (Do not emit notifications.) Possible values: - 0 - Do not emit notifications. - 1 - Emit notifications. - 2 - Emit notifications only for RTM_F_OFFLOAD_FAILED flag change. h](h)}(h#fib_notify_on_flag_change - INTEGERh]h#fib_notify_on_flag_change - INTEGER}(hj%OhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj!Oubh)}(hhh](j)}(huWhether to emit RTM_NEWROUTE notifications whenever RTM_F_OFFLOAD/ RTM_F_TRAP/RTM_F_OFFLOAD_FAILED flags are changed.h]huWhether to emit RTM_NEWROUTE notifications whenever RTM_F_OFFLOAD/ RTM_F_TRAP/RTM_F_OFFLOAD_FAILED flags are changed.}(hj6OhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3Oubj)}(hXAfter installing a route to the kernel, user space receives an acknowledgment, which means the route was installed in the kernel, but not necessarily in hardware. It is also possible for a route already installed in hardware to change its action and therefore its flags. For example, a host route that is trapping packets can be "promoted" to perform decapsulation following the installation of an IPinIP/VXLAN tunnel. The notifications will indicate to user-space the state of the route.h]hXAfter installing a route to the kernel, user space receives an acknowledgment, which means the route was installed in the kernel, but not necessarily in hardware. It is also possible for a route already installed in hardware to change its action and therefore its flags. For example, a host route that is trapping packets can be “promoted” to perform decapsulation following the installation of an IPinIP/VXLAN tunnel. The notifications will indicate to user-space the state of the route.}(hjDOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3Oubj)}(h'Default: 0 (Do not emit notifications.)h]h'Default: 0 (Do not emit notifications.)}(hjROhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3Oubj)}(hPossible values:h]hPossible values:}(hj`OhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj3Oubh)}(hhh](j)}(h0 - Do not emit notifications.h]j)}(hjsOh]h0 - Do not emit notifications.}(hjuOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjqOubah}(h]h ]h"]h$]h&]uh1hhjnOubj)}(h1 - Emit notifications.h]j)}(hjOh]h1 - Emit notifications.}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjOubah}(h]h ]h"]h$]h&]uh1hhjnOubj)}(hB2 - Emit notifications only for RTM_F_OFFLOAD_FAILED flag change. h]j)}(hA2 - Emit notifications only for RTM_F_OFFLOAD_FAILED flag change.h]hA2 - Emit notifications only for RTM_F_OFFLOAD_FAILED flag change.}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjOubah}(h]h ]h"]h$]h&]uh1hhjnOubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMhj3Oubeh}(h]h ]h"]h$]h&]uh1hhj!Oubeh}(h]h ]h"]h$]h&]uh1hhhhMhj3Ehhubh)}(hioam6_id - INTEGER Define the IOAM id of this node. Uses only 24 bits out of 32 in total. Min: 0 Max: 0xFFFFFF Default: 0xFFFFFF h](h)}(hioam6_id - INTEGERh]hioam6_id - INTEGER}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjOubh)}(hhh](j)}(hFDefine the IOAM id of this node. Uses only 24 bits out of 32 in total.h]hFDefine the IOAM id of this node. Uses only 24 bits out of 32 in total.}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjOubj)}(hMin: 0 Max: 0xFFFFFFh]hMin: 0 Max: 0xFFFFFF}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjOubj)}(hDefault: 0xFFFFFFh]hDefault: 0xFFFFFF}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjOubeh}(h]h ]h"]h$]h&]uh1hhjOubeh}(h]h ]h"]h$]h&]uh1hhhhMhj3Ehhubh)}(hioam6_id_wide - LONG INTEGER Define the wide IOAM id of this node. Uses only 56 bits out of 64 in total. Can be different from ioam6_id. Min: 0 Max: 0xFFFFFFFFFFFFFF Default: 0xFFFFFFFFFFFFFF h](h)}(hioam6_id_wide - LONG INTEGERh]hioam6_id_wide - LONG INTEGER}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjPubh)}(hhh](j)}(hkDefine the wide IOAM id of this node. Uses only 56 bits out of 64 in total. Can be different from ioam6_id.h]hkDefine the wide IOAM id of this node. Uses only 56 bits out of 64 in total. Can be different from ioam6_id.}(hj)PhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj&Pubj)}(hMin: 0 Max: 0xFFFFFFFFFFFFFFh]hMin: 0 Max: 0xFFFFFFFFFFFFFF}(hj7PhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj&Pubj)}(hDefault: 0xFFFFFFFFFFFFFFh]hDefault: 0xFFFFFFFFFFFFFF}(hjEPhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj&Pubeh}(h]h ]h"]h$]h&]uh1hhjPubeh}(h]h ]h"]h$]h&]uh1hhhhMhj3Ehhubeh}(h]h ]h"]h$]h&]uh1hhjEhhhhhNubj)}(hIPv6 Fragmentation:h]hIPv6 Fragmentation:}(hjePhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjEhhubh)}(hhh](h)}(hip6frag_high_thresh - INTEGER Maximum memory used to reassemble IPv6 fragments. When ip6frag_high_thresh bytes of memory is allocated for this purpose, the fragment handler will toss packets until ip6frag_low_thresh is reached. h](h)}(hip6frag_high_thresh - INTEGERh]hip6frag_high_thresh - INTEGER}(hjzPhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjvPubh)}(hhh]j)}(hMaximum memory used to reassemble IPv6 fragments. When ip6frag_high_thresh bytes of memory is allocated for this purpose, the fragment handler will toss packets until ip6frag_low_thresh is reached.h]hMaximum memory used to reassemble IPv6 fragments. When ip6frag_high_thresh bytes of memory is allocated for this purpose, the fragment handler will toss packets until ip6frag_low_thresh is reached.}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjPubah}(h]h ]h"]h$]h&]uh1hhjvPubeh}(h]h ]h"]h$]h&]uh1hhhhMhjsPubh)}(h5ip6frag_low_thresh - INTEGER See ip6frag_high_thresh h](h)}(hip6frag_low_thresh - INTEGERh]hip6frag_low_thresh - INTEGER}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjPubh)}(hhh]j)}(hSee ip6frag_high_threshh]hSee ip6frag_high_thresh}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjPubah}(h]h ]h"]h$]h&]uh1hhjPubeh}(h]h ]h"]h$]h&]uh1hhhhMhjsPhhubh)}(hKip6frag_time - INTEGER Time in seconds to keep an IPv6 fragment in memory. h](h)}(hip6frag_time - INTEGERh]hip6frag_time - INTEGER}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjPubh)}(hhh]j)}(h3Time in seconds to keep an IPv6 fragment in memory.h]h3Time in seconds to keep an IPv6 fragment in memory.}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhjPubah}(h]h ]h"]h$]h&]uh1hhjPubeh}(h]h ]h"]h$]h&]uh1hhhhMhjsPhhubh)}(h``conf/default/*``: Change the interface-specific default settings. These settings would be used during creating new interfaces. h](h)}(h``conf/default/*``:h](jq7)}(h``conf/default/*``h]hconf/default/*}(hj QhhhNhNubah}(h]h ]h"]h$]h&]uh1jp7hjQubh:}(hjQhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhMhjQubh)}(hhh](j)}(h/Change the interface-specific default settings.h]h/Change the interface-specific default settings.}(hj&QhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMhj#Qubj)}(h hj'Vubj)}(h Default: 1h]h Default: 1}(hjFVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMA hj'Vubeh}(h]h ]h"]h$]h&]uh1hhjVubeh}(h]h ]h"]h$]h&]uh1hhhhMA hjsPhhubh)}(haccept_ra_min_lft - INTEGER Minimum acceptable lifetime value in Router Advertisement. RA sections with a lifetime less than this value shall be ignored. Zero lifetimes stay unaffected. Default: 0 h](h)}(haccept_ra_min_lft - INTEGERh]haccept_ra_min_lft - INTEGER}(hjdVhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMI hj`Vubh)}(hhh](j)}(h:Minimum acceptable lifetime value in Router Advertisement.h]h:Minimum acceptable lifetime value in Router Advertisement.}(hjuVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMD hjrVubj)}(hbRA sections with a lifetime less than this value shall be ignored. Zero lifetimes stay unaffected.h]hbRA sections with a lifetime less than this value shall be ignored. Zero lifetimes stay unaffected.}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMF hjrVubj)}(h Default: 0h]h Default: 0}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMI hjrVubeh}(h]h ]h"]h$]h&]uh1hhj`Vubeh}(h]h ]h"]h$]h&]uh1hhhhMI hjsPhhubh)}(haccept_ra_pinfo - BOOLEAN Learn Prefix Information in Router Advertisement. Functional default: - enabled if accept_ra is enabled. - disabled if accept_ra is disabled. h](h)}(haccept_ra_pinfo - BOOLEANh]haccept_ra_pinfo - BOOLEAN}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMQ hjVubh)}(hhh](j)}(h1Learn Prefix Information in Router Advertisement.h]h1Learn Prefix Information in Router Advertisement.}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhML hjVubj)}(hFunctional default:h]hFunctional default:}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMN hjVubj )}(hH- enabled if accept_ra is enabled. - disabled if accept_ra is disabled. h]h)}(hhh](j)}(h enabled if accept_ra is enabled.h]j)}(hjVh]h enabled if accept_ra is enabled.}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMP hjVubah}(h]h ]h"]h$]h&]uh1hhjVubj)}(h#disabled if accept_ra is disabled. h]j)}(h"disabled if accept_ra is disabled.h]h"disabled if accept_ra is disabled.}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMQ hjVubah}(h]h ]h"]h$]h&]uh1hhjVubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMP hjVubah}(h]h ]h"]h$]h&]uh1j hhhMP hjVubeh}(h]h ]h"]h$]h&]uh1hhjVubeh}(h]h ]h"]h$]h&]uh1hhhhMQ hjsPhhubh)}(hXqra_honor_pio_life - BOOLEAN Whether to use RFC4862 Section 5.5.3e to determine the valid lifetime of an address matching a prefix sent in a Router Advertisement Prefix Information Option. - If enabled, the PIO valid lifetime will always be honored. - If disabled, RFC4862 section 5.5.3e is used to determine the valid lifetime of the address. Default: 0 (disabled) h](h)}(hra_honor_pio_life - BOOLEANh]hra_honor_pio_life - BOOLEAN}(hj.WhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM\ hj*Wubh)}(hhh](j)}(hWhether to use RFC4862 Section 5.5.3e to determine the valid lifetime of an address matching a prefix sent in a Router Advertisement Prefix Information Option.h]hWhether to use RFC4862 Section 5.5.3e to determine the valid lifetime of an address matching a prefix sent in a Router Advertisement Prefix Information Option.}(hj?WhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMT hj= 0: Accept only routing header type 2. - < 0: Do not accept routing header. Default: 0 h](h)}(haccept_source_route - INTEGERh]haccept_source_route - INTEGER}(hjZhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjZubh)}(hhh](j)}(h1Accept source routing (routing extension header).h]h1Accept source routing (routing extension header).}(hjZhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjZubh)}(hhh](j)}(h(>= 0: Accept only routing header type 2.h]j)}(hjZh]h(>= 0: Accept only routing header type 2.}(hjZhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjZubah}(h]h ]h"]h$]h&]uh1hhjZubj)}(h#< 0: Do not accept routing header. h]j)}(h"< 0: Do not accept routing header.h]h"< 0: Do not accept routing header.}(hjZhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjZubah}(h]h ]h"]h$]h&]uh1hhjZubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hjZubj)}(h Default: 0h]h Default: 0}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjZubeh}(h]h ]h"]h$]h&]uh1hhjZubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hautoconf - BOOLEAN Autoconfigure addresses using Prefix Information in Router Advertisements. Functional default: - enabled if accept_ra_pinfo is enabled. - disabled if accept_ra_pinfo is disabled. h](h)}(hautoconf - BOOLEANh]hautoconf - BOOLEAN}(hj%[hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj![ubh)}(hhh](j)}(hJAutoconfigure addresses using Prefix Information in Router Advertisements.h]hJAutoconfigure addresses using Prefix Information in Router Advertisements.}(hj6[hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj3[ubj)}(hFunctional default:h]hFunctional default:}(hjD[hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj3[ubj )}(hT- enabled if accept_ra_pinfo is enabled. - disabled if accept_ra_pinfo is disabled. h]h)}(hhh](j)}(h&enabled if accept_ra_pinfo is enabled.h]j)}(hj[[h]h&enabled if accept_ra_pinfo is enabled.}(hj][hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjY[ubah}(h]h ]h"]h$]h&]uh1hhjV[ubj)}(h)disabled if accept_ra_pinfo is disabled. h]j)}(h(disabled if accept_ra_pinfo is disabled.h]h(disabled if accept_ra_pinfo is disabled.}(hjt[hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjp[ubah}(h]h ]h"]h$]h&]uh1hhjV[ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hjR[ubah}(h]h ]h"]h$]h&]uh1j hhhM hj3[ubeh}(h]h ]h"]h$]h&]uh1hhj![ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(h^dad_transmits - INTEGER The amount of Duplicate Address Detection probes to send. Default: 1 h](h)}(hdad_transmits - INTEGERh]hdad_transmits - INTEGER}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj[ubh)}(hhh](j)}(h9The amount of Duplicate Address Detection probes to send.h]h9The amount of Duplicate Address Detection probes to send.}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj[ubj)}(h Default: 1h]h Default: 1}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj[ubeh}(h]h ]h"]h$]h&]uh1hhj[ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hXforwarding - INTEGER Configure interface-specific Host/Router behaviour. .. note:: It is recommended to have the same setting on all interfaces; mixed router/host scenarios are rather uncommon. Possible values are: - 0 Forwarding disabled - 1 Forwarding enabled **FALSE (0)**: By default, Host behaviour is assumed. This means: 1. IsRouter flag is not set in Neighbour Advertisements. 2. If accept_ra is TRUE (default), transmit Router Solicitations. 3. If accept_ra is TRUE (default), accept Router Advertisements (and do autoconfiguration). 4. If accept_redirects is TRUE (default), accept Redirects. **TRUE (1)**: If local forwarding is enabled, Router behaviour is assumed. This means exactly the reverse from the above: 1. IsRouter flag is set in Neighbour Advertisements. 2. Router Solicitations are not sent unless accept_ra is 2. 3. Router Advertisements are ignored unless accept_ra is 2. 4. Redirects are ignored. Default: 0 (disabled) if global forwarding is disabled (default), otherwise 1 (enabled). h](h)}(hforwarding - INTEGERh]hforwarding - INTEGER}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj[ubh)}(hhh](j)}(h3Configure interface-specific Host/Router behaviour.h]h3Configure interface-specific Host/Router behaviour.}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj[ubjC7)}(hnIt is recommended to have the same setting on all interfaces; mixed router/host scenarios are rather uncommon.h]j)}(hnIt is recommended to have the same setting on all interfaces; mixed router/host scenarios are rather uncommon.h]hnIt is recommended to have the same setting on all interfaces; mixed router/host scenarios are rather uncommon.}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj\ubah}(h]h ]h"]h$]h&]uh1jB7hj[ubj)}(hPossible values are:h]hPossible values are:}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj[ubj )}(h/- 0 Forwarding disabled - 1 Forwarding enabled h]h)}(hhh](j)}(h0 Forwarding disabledh]j)}(hj/\h]h0 Forwarding disabled}(hj1\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj-\ubah}(h]h ]h"]h$]h&]uh1hhj*\ubj)}(h1 Forwarding enabled h]j)}(h1 Forwarding enabledh]h1 Forwarding enabled}(hjH\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjD\ubah}(h]h ]h"]h$]h&]uh1hhj*\ubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hj&\ubah}(h]h ]h"]h$]h&]uh1j hhhM hj[ubj)}(h**FALSE (0)**:h](hstrong)}(h **FALSE (0)**h]h FALSE (0)}(hjn\hhhNhNubah}(h]h ]h"]h$]h&]uh1jl\hjh\ubh:}(hjh\hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM hj[ubj)}(h3By default, Host behaviour is assumed. This means:h]h3By default, Host behaviour is assumed. This means:}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj[ubj)}(hhh](j)}(h5IsRouter flag is not set in Neighbour Advertisements.h]j)}(hj\h]h5IsRouter flag is not set in Neighbour Advertisements.}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj\ubah}(h]h ]h"]h$]h&]uh1hhj\ubj)}(h>If accept_ra is TRUE (default), transmit Router Solicitations.h]j)}(h>If accept_ra is TRUE (default), transmit Router Solicitations.h]h>If accept_ra is TRUE (default), transmit Router Solicitations.}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj\ubah}(h]h ]h"]h$]h&]uh1hhj\ubj)}(hXIf accept_ra is TRUE (default), accept Router Advertisements (and do autoconfiguration).h]j)}(hXIf accept_ra is TRUE (default), accept Router Advertisements (and do autoconfiguration).h]hXIf accept_ra is TRUE (default), accept Router Advertisements (and do autoconfiguration).}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj\ubah}(h]h ]h"]h$]h&]uh1hhj\ubj)}(h9If accept_redirects is TRUE (default), accept Redirects. h]j)}(h8If accept_redirects is TRUE (default), accept Redirects.h]h8If accept_redirects is TRUE (default), accept Redirects.}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj\ubah}(h]h ]h"]h$]h&]uh1hhj\ubeh}(h]h ]h"]h$]h&]jaarabicjchje.uh1jhj[ubj)}(h **TRUE (1)**:h](jm\)}(h **TRUE (1)**h]hTRUE (1)}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1jl\hj\ubh:}(hj\hhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM hj[ubj)}(hkIf local forwarding is enabled, Router behaviour is assumed. This means exactly the reverse from the above:h]hkIf local forwarding is enabled, Router behaviour is assumed. This means exactly the reverse from the above:}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj[ubj)}(hhh](j)}(h1IsRouter flag is set in Neighbour Advertisements.h]j)}(hj-]h]h1IsRouter flag is set in Neighbour Advertisements.}(hj/]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj+]ubah}(h]h ]h"]h$]h&]uh1hhj(]ubj)}(h8Router Solicitations are not sent unless accept_ra is 2.h]j)}(hjD]h]h8Router Solicitations are not sent unless accept_ra is 2.}(hjF]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjB]ubah}(h]h ]h"]h$]h&]uh1hhj(]ubj)}(h8Router Advertisements are ignored unless accept_ra is 2.h]j)}(hj[]h]h8Router Advertisements are ignored unless accept_ra is 2.}(hj]]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjY]ubah}(h]h ]h"]h$]h&]uh1hhj(]ubj)}(hRedirects are ignored. h]j)}(hRedirects are ignored.h]hRedirects are ignored.}(hjt]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjp]ubah}(h]h ]h"]h$]h&]uh1hhj(]ubeh}(h]h ]h"]h$]h&]jaj\jchjej\uh1jhj[ubj)}(hXDefault: 0 (disabled) if global forwarding is disabled (default), otherwise 1 (enabled).h]hXDefault: 0 (disabled) if global forwarding is disabled (default), otherwise 1 (enabled).}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj[ubeh}(h]h ]h"]h$]h&]uh1hhj[ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(h;hop_limit - INTEGER Default Hop Limit to set. Default: 64 h](h)}(hhop_limit - INTEGERh]hhop_limit - INTEGER}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj]ubh)}(hhh](j)}(hDefault Hop Limit to set.h]hDefault Hop Limit to set.}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj]ubj)}(h Default: 64h]h Default: 64}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj]ubeh}(h]h ]h"]h$]h&]uh1hhj]ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hSmtu - INTEGER Default Maximum Transfer Unit Default: 1280 (IPv6 required minimum) h](h)}(h mtu - INTEGERh]h mtu - INTEGER}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj]ubh)}(hhh](j)}(hDefault Maximum Transfer Unith]hDefault Maximum Transfer Unit}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj]ubj)}(h%Default: 1280 (IPv6 required minimum)h]h%Default: 1280 (IPv6 required minimum)}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj]ubeh}(h]h ]h"]h$]h&]uh1hhj]ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hip_nonlocal_bind - BOOLEAN If set, allows processes to bind() to non-local IPv6 addresses, which can be quite useful - but may break some applications. Default: 0 h](h)}(hip_nonlocal_bind - BOOLEANh]hip_nonlocal_bind - BOOLEAN}(hj&^hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj"^ubh)}(hhh](j)}(h|If set, allows processes to bind() to non-local IPv6 addresses, which can be quite useful - but may break some applications.h]h|If set, allows processes to bind() to non-local IPv6 addresses, which can be quite useful - but may break some applications.}(hj7^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj4^ubj)}(h Default: 0h]h Default: 0}(hjE^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj4^ubeh}(h]h ]h"]h$]h&]uh1hhj"^ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hxrouter_probe_interval - INTEGER Minimum interval (in seconds) between Router Probing described in RFC4191. Default: 60 h](h)}(hrouter_probe_interval - INTEGERh]hrouter_probe_interval - INTEGER}(hjc^hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj_^ubh)}(hhh](j)}(hJMinimum interval (in seconds) between Router Probing described in RFC4191.h]hJMinimum interval (in seconds) between Router Probing described in RFC4191.}(hjt^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjq^ubj)}(h Default: 60h]h Default: 60}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjq^ubeh}(h]h ]h"]h$]h&]uh1hhj_^ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hrouter_solicitation_delay - INTEGER Number of seconds to wait after interface is brought up before sending Router Solicitations. Default: 1 h](h)}(h#router_solicitation_delay - INTEGERh]h#router_solicitation_delay - INTEGER}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj^ubh)}(hhh](j)}(h\Number of seconds to wait after interface is brought up before sending Router Solicitations.h]h\Number of seconds to wait after interface is brought up before sending Router Solicitations.}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj^ubj)}(h Default: 1h]h Default: 1}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj^ubeh}(h]h ]h"]h$]h&]uh1hhj^ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hkrouter_solicitation_interval - INTEGER Number of seconds to wait between Router Solicitations. Default: 4 h](h)}(h&router_solicitation_interval - INTEGERh]h&router_solicitation_interval - INTEGER}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj^ubh)}(hhh](j)}(h7Number of seconds to wait between Router Solicitations.h]h7Number of seconds to wait between Router Solicitations.}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj^ubj)}(h Default: 4h]h Default: 4}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj^ubeh}(h]h ]h"]h$]h&]uh1hhj^ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hyrouter_solicitations - INTEGER Number of Router Solicitations to send until assuming no routers are present. Default: 3 h](h)}(hrouter_solicitations - INTEGERh]hrouter_solicitations - INTEGER}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj_ubh)}(hhh](j)}(hMNumber of Router Solicitations to send until assuming no routers are present.h]hMNumber of Router Solicitations to send until assuming no routers are present.}(hj+_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj(_ubj)}(h Default: 3h]h Default: 3}(hj9_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj(_ubeh}(h]h ]h"]h$]h&]uh1hhj_ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(huse_oif_addrs_only - BOOLEAN When enabled, the candidate source addresses for destinations routed via this interface are restricted to the set of addresses configured on this interface (vis. RFC 6724, section 4). Default: false h](h)}(huse_oif_addrs_only - BOOLEANh]huse_oif_addrs_only - BOOLEAN}(hjW_hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjS_ubh)}(hhh](j)}(hWhen enabled, the candidate source addresses for destinations routed via this interface are restricted to the set of addresses configured on this interface (vis. RFC 6724, section 4).h]hWhen enabled, the candidate source addresses for destinations routed via this interface are restricted to the set of addresses configured on this interface (vis. RFC 6724, section 4).}(hjh_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hje_ubj)}(hDefault: falseh]hDefault: false}(hjv_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hje_ubeh}(h]h ]h"]h$]h&]uh1hhjS_ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hXuse_tempaddr - INTEGER Preference for Privacy Extensions (RFC3041). * <= 0 : disable Privacy Extensions * == 1 : enable Privacy Extensions, but prefer public addresses over temporary addresses. * > 1 : enable Privacy Extensions and prefer temporary addresses over public addresses. Default: * 0 (for most devices) * -1 (for point-to-point devices and loopback devices) h](h)}(huse_tempaddr - INTEGERh]huse_tempaddr - INTEGER}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj_ubh)}(hhh](j)}(h,Preference for Privacy Extensions (RFC3041).h]h,Preference for Privacy Extensions (RFC3041).}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj_ubj )}(h* <= 0 : disable Privacy Extensions * == 1 : enable Privacy Extensions, but prefer public addresses over temporary addresses. * > 1 : enable Privacy Extensions and prefer temporary addresses over public addresses. h]h)}(hhh](j)}(h!<= 0 : disable Privacy Extensionsh]j)}(hj_h]h!<= 0 : disable Privacy Extensions}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj_ubah}(h]h ]h"]h$]h&]uh1hhj_ubj)}(hW== 1 : enable Privacy Extensions, but prefer public addresses over temporary addresses.h]j)}(hW== 1 : enable Privacy Extensions, but prefer public addresses over temporary addresses.h]hW== 1 : enable Privacy Extensions, but prefer public addresses over temporary addresses.}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj_ubah}(h]h ]h"]h$]h&]uh1hhj_ubj)}(hW> 1 : enable Privacy Extensions and prefer temporary addresses over public addresses. h]j)}(hV> 1 : enable Privacy Extensions and prefer temporary addresses over public addresses.h]hV> 1 : enable Privacy Extensions and prefer temporary addresses over public addresses.}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj_ubah}(h]h ]h"]h$]h&]uh1hhj_ubeh}(h]h ]h"]h$]h&]j8jXuh1hhhhM hj_ubah}(h]h ]h"]h$]h&]uh1j hhhM hj_ubj)}(hDefault:h]hDefault:}(hj `hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj_ubj )}(hN* 0 (for most devices) * -1 (for point-to-point devices and loopback devices) h]h)}(hhh](j)}(h0 (for most devices)h]j)}(hj$`h]h0 (for most devices)}(hj&`hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj"`ubah}(h]h ]h"]h$]h&]uh1hhj`ubj)}(h5-1 (for point-to-point devices and loopback devices) h]j)}(h4-1 (for point-to-point devices and loopback devices)h]h4-1 (for point-to-point devices and loopback devices)}(hj=`hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj9`ubah}(h]h ]h"]h$]h&]uh1hhj`ubeh}(h]h ]h"]h$]h&]j8jXuh1hhhhM hj`ubah}(h]h ]h"]h$]h&]uh1j hhhM hj_ubeh}(h]h ]h"]h$]h&]uh1hhj_ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(htemp_valid_lft - INTEGER valid lifetime (in seconds) for temporary addresses. If less than the minimum required lifetime (typically 5-7 seconds), temporary addresses will not be created. Default: 172800 (2 days) h](h)}(htemp_valid_lft - INTEGERh]htemp_valid_lft - INTEGER}(hjm`hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hji`ubh)}(hhh](j)}(hvalid lifetime (in seconds) for temporary addresses. If less than the minimum required lifetime (typically 5-7 seconds), temporary addresses will not be created.h]hvalid lifetime (in seconds) for temporary addresses. If less than the minimum required lifetime (typically 5-7 seconds), temporary addresses will not be created.}(hj~`hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj{`ubj)}(hDefault: 172800 (2 days)h]hDefault: 172800 (2 days)}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj{`ubeh}(h]h ]h"]h$]h&]uh1hhji`ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hXUtemp_prefered_lft - INTEGER Preferred lifetime (in seconds) for temporary addresses. If temp_prefered_lft is less than the minimum required lifetime (typically 5-7 seconds), the preferred lifetime is the minimum required. If temp_prefered_lft is greater than temp_valid_lft, the preferred lifetime is temp_valid_lft. Default: 86400 (1 day) h](h)}(htemp_prefered_lft - INTEGERh]htemp_prefered_lft - INTEGER}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj`ubh)}(hhh](j)}(hX Preferred lifetime (in seconds) for temporary addresses. If temp_prefered_lft is less than the minimum required lifetime (typically 5-7 seconds), the preferred lifetime is the minimum required. If temp_prefered_lft is greater than temp_valid_lft, the preferred lifetime is temp_valid_lft.h]hX Preferred lifetime (in seconds) for temporary addresses. If temp_prefered_lft is less than the minimum required lifetime (typically 5-7 seconds), the preferred lifetime is the minimum required. If temp_prefered_lft is greater than temp_valid_lft, the preferred lifetime is temp_valid_lft.}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj`ubj)}(hDefault: 86400 (1 day)h]hDefault: 86400 (1 day)}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj`ubeh}(h]h ]h"]h$]h&]uh1hhj`ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hkeep_addr_on_down - INTEGER Keep all IPv6 addresses on an interface down event. If set static global addresses with no expiration time are not flushed. * >0 : enabled * 0 : system default * <0 : disabled Default: 0 (addresses are removed) h](h)}(hkeep_addr_on_down - INTEGERh]hkeep_addr_on_down - INTEGER}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM* hj`ubh)}(hhh](j)}(h{Keep all IPv6 addresses on an interface down event. If set static global addresses with no expiration time are not flushed.h]h{Keep all IPv6 addresses on an interface down event. If set static global addresses with no expiration time are not flushed.}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM# hj`ubh)}(hhh](j)}(h >0 : enabledh]j)}(hj ah]h >0 : enabled}(hj ahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM& hj aubah}(h]h ]h"]h$]h&]uh1hhjaubj)}(h0 : system defaulth]j)}(hj"ah]h0 : system default}(hj$ahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM' hj aubah}(h]h ]h"]h$]h&]uh1hhjaubj)}(h<0 : disabled h]j)}(h <0 : disabledh]h <0 : disabled}(hj;ahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM( hj7aubah}(h]h ]h"]h$]h&]uh1hhjaubeh}(h]h ]h"]h$]h&]j8jXuh1hhhhM& hj`ubj)}(h"Default: 0 (addresses are removed)h]h"Default: 0 (addresses are removed)}(hjUahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM* hj`ubeh}(h]h ]h"]h$]h&]uh1hhj`ubeh}(h]h ]h"]h$]h&]uh1hhhhM* hjsPhhubh)}(hmax_desync_factor - INTEGER Maximum value for DESYNC_FACTOR, which is a random value that ensures that clients don't synchronize with each other and generate new addresses at exactly the same time. value is in seconds. Default: 600 h](h)}(hmax_desync_factor - INTEGERh]hmax_desync_factor - INTEGER}(hjsahhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM2 hjoaubh)}(hhh](j)}(hMaximum value for DESYNC_FACTOR, which is a random value that ensures that clients don't synchronize with each other and generate new addresses at exactly the same time. value is in seconds.h]hMaximum value for DESYNC_FACTOR, which is a random value that ensures that clients don’t synchronize with each other and generate new addresses at exactly the same time. value is in seconds.}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM- hjaubj)}(h Default: 600h]h Default: 600}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM2 hjaubeh}(h]h ]h"]h$]h&]uh1hhjoaubeh}(h]h ]h"]h$]h&]uh1hhhhM2 hjsPhhubh)}(hXregen_min_advance - INTEGER How far in advance (in seconds), at minimum, to create a new temporary address before the current one is deprecated. This value is added to the amount of time that may be required for duplicate address detection to determine when to create a new address. Linux permits setting this value to less than the default of 2 seconds, but a value less than 2 does not conform to RFC 8981. Default: 2 h](h)}(hregen_min_advance - INTEGERh]hregen_min_advance - INTEGER}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM< hjaubh)}(hhh](j)}(hX|How far in advance (in seconds), at minimum, to create a new temporary address before the current one is deprecated. This value is added to the amount of time that may be required for duplicate address detection to determine when to create a new address. Linux permits setting this value to less than the default of 2 seconds, but a value less than 2 does not conform to RFC 8981.h]hX|How far in advance (in seconds), at minimum, to create a new temporary address before the current one is deprecated. This value is added to the amount of time that may be required for duplicate address detection to determine when to create a new address. Linux permits setting this value to less than the default of 2 seconds, but a value less than 2 does not conform to RFC 8981.}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM5 hjaubj)}(h Default: 2h]h Default: 2}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM< hjaubeh}(h]h ]h"]h$]h&]uh1hhjaubeh}(h]h ]h"]h$]h&]uh1hhhhM< hjsPhhubh)}(hzregen_max_retry - INTEGER Number of attempts before give up attempting to generate valid temporary addresses. Default: 5 h](h)}(hregen_max_retry - INTEGERh]hregen_max_retry - INTEGER}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMB hjaubh)}(hhh](j)}(hSNumber of attempts before give up attempting to generate valid temporary addresses.h]hSNumber of attempts before give up attempting to generate valid temporary addresses.}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM? hjaubj)}(h Default: 5h]h Default: 5}(hj bhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMB hjaubeh}(h]h ]h"]h$]h&]uh1hhjaubeh}(h]h ]h"]h$]h&]uh1hhhhMB hjsPhhubh)}(hX+max_addresses - INTEGER Maximum number of autoconfigured addresses per interface. Setting to zero disables the limitation. It is not recommended to set this value too large (or to zero) because it would be an easy way to crash the kernel by allowing too many addresses to be created. Default: 16 h](h)}(hmax_addresses - INTEGERh]hmax_addresses - INTEGER}(hj*bhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMJ hj&bubh)}(hhh](j)}(hXMaximum number of autoconfigured addresses per interface. Setting to zero disables the limitation. It is not recommended to set this value too large (or to zero) because it would be an easy way to crash the kernel by allowing too many addresses to be created.h]hXMaximum number of autoconfigured addresses per interface. Setting to zero disables the limitation. It is not recommended to set this value too large (or to zero) because it would be an easy way to crash the kernel by allowing too many addresses to be created.}(hj;bhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhME hj8bubj)}(h Default: 16h]h Default: 16}(hjIbhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMJ hj8bubeh}(h]h ]h"]h$]h&]uh1hhj&bubeh}(h]h ]h"]h$]h&]uh1hhhhMJ hjsPhhubh)}(hXfdisable_ipv6 - BOOLEAN Disable IPv6 operation. If accept_dad is set to 2, this value will be dynamically set to TRUE if DAD fails for the link-local address. Default: FALSE (enable IPv6 operation) When this value is changed from 1 to 0 (IPv6 is being enabled), it will dynamically create a link-local address on the given interface and start Duplicate Address Detection, if necessary. When this value is changed from 0 to 1 (IPv6 is being disabled), it will dynamically delete all addresses and routes on the given interface. From now on it will not possible to add addresses/routes to the selected interface. h](h)}(hdisable_ipv6 - BOOLEANh]hdisable_ipv6 - BOOLEAN}(hjgbhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMZ hjcbubh)}(hhh](j)}(hDisable IPv6 operation. If accept_dad is set to 2, this value will be dynamically set to TRUE if DAD fails for the link-local address.h]hDisable IPv6 operation. If accept_dad is set to 2, this value will be dynamically set to TRUE if DAD fails for the link-local address.}(hjxbhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMM hjububj)}(h&Default: FALSE (enable IPv6 operation)h]h&Default: FALSE (enable IPv6 operation)}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMQ hjububj)}(hWhen this value is changed from 1 to 0 (IPv6 is being enabled), it will dynamically create a link-local address on the given interface and start Duplicate Address Detection, if necessary.h]hWhen this value is changed from 1 to 0 (IPv6 is being enabled), it will dynamically create a link-local address on the given interface and start Duplicate Address Detection, if necessary.}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMS hjububj)}(hWhen this value is changed from 0 to 1 (IPv6 is being disabled), it will dynamically delete all addresses and routes on the given interface. From now on it will not possible to add addresses/routes to the selected interface.h]hWhen this value is changed from 0 to 1 (IPv6 is being disabled), it will dynamically delete all addresses and routes on the given interface. From now on it will not possible to add addresses/routes to the selected interface.}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMW hjububeh}(h]h ]h"]h$]h&]uh1hhjcbubeh}(h]h ]h"]h$]h&]uh1hhhhMZ hjsPhhubh)}(hXaccept_dad - INTEGER Whether to accept DAD (Duplicate Address Detection). == ============================================================== 0 Disable DAD 1 Enable DAD (default) 2 Enable DAD, and disable IPv6 operation if MAC-based duplicate link-local address has been found. == ============================================================== DAD operation and mode on a given interface will be selected according to the maximum value of conf/{all,interface}/accept_dad. h](h)}(haccept_dad - INTEGERh]haccept_dad - INTEGER}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMg hjbubh)}(hhh](j)}(h4Whether to accept DAD (Duplicate Address Detection).h]h4Whether to accept DAD (Duplicate Address Detection).}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM] hjbubj )}(hX== ============================================================== 0 Disable DAD 1 Enable DAD (default) 2 Enable DAD, and disable IPv6 operation if MAC-based duplicate link-local address has been found. == ============================================================== h]j[)}(hhh]j`)}(hhh](je)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjbubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthK>uh1jdhjbubj{)}(hhh](j)}(hhh](j)}(hhh]j)}(hjh]h0}(hjchhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM` hjcubah}(h]h ]h"]h$]h&]uh1jhjcubj)}(hhh]j)}(h Disable DADh]h Disable DAD}(hjchhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM` hjcubah}(h]h ]h"]h$]h&]uh1jhjcubeh}(h]h ]h"]h$]h&]uh1jhjbubj)}(hhh](j)}(hhh]j)}(hjh]h1}(hjQuoting from RFC 2461, section 4.4, Target link-layer address:h]h>Quoting from RFC 2461, section 4.4, Target link-layer address:}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMo hjcubj)}(hX"The option MUST be included for multicast solicitations in order to avoid infinite Neighbor Solicitation "recursion" when the peer node does not have a cache entry to return a Neighbor Advertisements message. When responding to unicast solicitations, the option can be omitted since the sender of the solicitation has the correct link- layer address; otherwise it would not have be able to send the unicast solicitation in the first place. However, including the link-layer address in this case adds little overhead and eliminates a potential race condition where the sender deletes the cached link-layer address prior to receiving a response to a previous solicitation."h]hX“The option MUST be included for multicast solicitations in order to avoid infinite Neighbor Solicitation “recursion” when the peer node does not have a cache entry to return a Neighbor Advertisements message. When responding to unicast solicitations, the option can be omitted since the sender of the solicitation has the correct link- layer address; otherwise it would not have be able to send the unicast solicitation in the first place. However, including the link-layer address in this case adds little overhead and eliminates a potential race condition where the sender deletes the cached link-layer address prior to receiving a response to a previous solicitation.”}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMq hjcubeh}(h]h ]h"]h$]h&]uh1hhjcubeh}(h]h ]h"]h$]h&]uh1hhhhMz hjsPhhubh)}(hndisc_notify - BOOLEAN Define mode for notification of address and device changes. * 0 - (default): do nothing * 1 - Generate unsolicited neighbour advertisements when device is brought up or hardware address changes. h](h)}(hndisc_notify - BOOLEANh]hndisc_notify - BOOLEAN}(hj2dhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj.dubh)}(hhh](j)}(h;Define mode for notification of address and device changes.h]h;Define mode for notification of address and device changes.}(hjCdhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM} hj@dubh)}(hhh](j)}(h0 - (default): do nothingh]j)}(hjVdh]h0 - (default): do nothing}(hjXdhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjTdubah}(h]h ]h"]h$]h&]uh1hhjQdubj)}(hi1 - Generate unsolicited neighbour advertisements when device is brought up or hardware address changes. h]j)}(hh1 - Generate unsolicited neighbour advertisements when device is brought up or hardware address changes.h]hh1 - Generate unsolicited neighbour advertisements when device is brought up or hardware address changes.}(hjodhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjkdubah}(h]h ]h"]h$]h&]uh1hhjQdubeh}(h]h ]h"]h$]h&]j8jXuh1hhhhM hj@dubeh}(h]h ]h"]h$]h&]uh1hhj.dubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hXndisc_tclass - INTEGER The IPv6 Traffic Class to use by default when sending IPv6 Neighbor Discovery (Router Solicitation, Router Advertisement, Neighbor Solicitation, Neighbor Advertisement, Redirect) messages. These 8 bits can be interpreted as 6 high order bits holding the DSCP value and 2 low order bits representing ECN (which you probably want to leave cleared). * 0 - (default) h](h)}(hndisc_tclass - INTEGERh]hndisc_tclass - INTEGER}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjdubh)}(hhh](j)}(hXZThe IPv6 Traffic Class to use by default when sending IPv6 Neighbor Discovery (Router Solicitation, Router Advertisement, Neighbor Solicitation, Neighbor Advertisement, Redirect) messages. These 8 bits can be interpreted as 6 high order bits holding the DSCP value and 2 low order bits representing ECN (which you probably want to leave cleared).h]hXZThe IPv6 Traffic Class to use by default when sending IPv6 Neighbor Discovery (Router Solicitation, Router Advertisement, Neighbor Solicitation, Neighbor Advertisement, Redirect) messages. These 8 bits can be interpreted as 6 high order bits holding the DSCP value and 2 low order bits representing ECN (which you probably want to leave cleared).}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjdubh)}(hhh]j)}(h0 - (default) h]j)}(h 0 - (default)h]h 0 - (default)}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjdubah}(h]h ]h"]h$]h&]uh1hhjdubah}(h]h ]h"]h$]h&]j8jXuh1hhhhM hjdubeh}(h]h ]h"]h$]h&]uh1hhjdubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hXndisc_evict_nocarrier - BOOLEAN Clears the neighbor discovery table on NOCARRIER events. This option is important for wireless devices where the neighbor discovery cache should not be cleared when roaming between access points on the same network. In most cases this should remain as the default (1). - 1 - (default): Clear neighbor discover cache on NOCARRIER events. - 0 - Do not clear neighbor discovery cache on NOCARRIER events. h](h)}(hndisc_evict_nocarrier - BOOLEANh]hndisc_evict_nocarrier - BOOLEAN}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjdubh)}(hhh](j)}(hX Clears the neighbor discovery table on NOCARRIER events. This option is important for wireless devices where the neighbor discovery cache should not be cleared when roaming between access points on the same network. In most cases this should remain as the default (1).h]hX Clears the neighbor discovery table on NOCARRIER events. This option is important for wireless devices where the neighbor discovery cache should not be cleared when roaming between access points on the same network. In most cases this should remain as the default (1).}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjdubh)}(hhh](j)}(hA1 - (default): Clear neighbor discover cache on NOCARRIER events.h]j)}(hj eh]hA1 - (default): Clear neighbor discover cache on NOCARRIER events.}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj eubah}(h]h ]h"]h$]h&]uh1hhjeubj)}(h?0 - Do not clear neighbor discovery cache on NOCARRIER events. h]j)}(h>0 - Do not clear neighbor discovery cache on NOCARRIER events.h]h>0 - Do not clear neighbor discovery cache on NOCARRIER events.}(hj&ehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj"eubah}(h]h ]h"]h$]h&]uh1hhjeubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hjdubeh}(h]h ]h"]h$]h&]uh1hhjdubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hmldv1_unsolicited_report_interval - INTEGER The interval in milliseconds in which the next unsolicited MLDv1 report retransmit will take place. Default: 10000 (10 seconds) h](h)}(h+mldv1_unsolicited_report_interval - INTEGERh]h+mldv1_unsolicited_report_interval - INTEGER}(hjPehhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjLeubh)}(hhh](j)}(hcThe interval in milliseconds in which the next unsolicited MLDv1 report retransmit will take place.h]hcThe interval in milliseconds in which the next unsolicited MLDv1 report retransmit will take place.}(hjaehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj^eubj)}(hDefault: 10000 (10 seconds)h]hDefault: 10000 (10 seconds)}(hjoehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj^eubeh}(h]h ]h"]h$]h&]uh1hhjLeubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hmldv2_unsolicited_report_interval - INTEGER The interval in milliseconds in which the next unsolicited MLDv2 report retransmit will take place. Default: 1000 (1 second) h](h)}(h+mldv2_unsolicited_report_interval - INTEGERh]h+mldv2_unsolicited_report_interval - INTEGER}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjeubh)}(hhh](j)}(hcThe interval in milliseconds in which the next unsolicited MLDv2 report retransmit will take place.h]hcThe interval in milliseconds in which the next unsolicited MLDv2 report retransmit will take place.}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjeubj)}(hDefault: 1000 (1 second)h]hDefault: 1000 (1 second)}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjeubeh}(h]h ]h"]h$]h&]uh1hhjeubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hforce_mld_version - INTEGER * 0 - (default) No enforcement of a MLD version, MLDv1 fallback allowed * 1 - Enforce to use MLD version 1 * 2 - Enforce to use MLD version 2 h](h)}(hforce_mld_version - INTEGERh]hforce_mld_version - INTEGER}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjeubh)}(hhh]h)}(hhh](j)}(hE0 - (default) No enforcement of a MLD version, MLDv1 fallback allowedh]j)}(hjeh]hE0 - (default) No enforcement of a MLD version, MLDv1 fallback allowed}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjeubah}(h]h ]h"]h$]h&]uh1hhjeubj)}(h 1 - Enforce to use MLD version 1h]j)}(hjeh]h 1 - Enforce to use MLD version 1}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjeubah}(h]h ]h"]h$]h&]uh1hhjeubj)}(h!2 - Enforce to use MLD version 2 h]j)}(h 2 - Enforce to use MLD version 2h]h 2 - Enforce to use MLD version 2}(hjfhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj fubah}(h]h ]h"]h$]h&]uh1hhjeubeh}(h]h ]h"]h$]h&]j8jXuh1hhhhM hjeubah}(h]h ]h"]h$]h&]uh1hhjeubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hsuppress_frag_ndisc - INTEGER Control RFC 6980 (Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery) behavior: * 1 - (default) discard fragmented neighbor discovery packets * 0 - allow fragmented neighbor discovery packets h](h)}(hsuppress_frag_ndisc - INTEGERh]hsuppress_frag_ndisc - INTEGER}(hj:fhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj6fubh)}(hhh](j)}(heControl RFC 6980 (Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery) behavior:h]heControl RFC 6980 (Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery) behavior:}(hjKfhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjHfubh)}(hhh](j)}(h;1 - (default) discard fragmented neighbor discovery packetsh]j)}(hj^fh]h;1 - (default) discard fragmented neighbor discovery packets}(hj`fhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj\fubah}(h]h ]h"]h$]h&]uh1hhjYfubj)}(h00 - allow fragmented neighbor discovery packets h]j)}(h/0 - allow fragmented neighbor discovery packetsh]h/0 - allow fragmented neighbor discovery packets}(hjwfhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjsfubah}(h]h ]h"]h$]h&]uh1hhjYfubeh}(h]h ]h"]h$]h&]j8jXuh1hhhhM hjHfubeh}(h]h ]h"]h$]h&]uh1hhj6fubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hX2optimistic_dad - BOOLEAN Whether to perform Optimistic Duplicate Address Detection (RFC 4429). * 0: disabled (default) * 1: enabled Optimistic Duplicate Address Detection for the interface will be enabled if at least one of conf/{all,interface}/optimistic_dad is set to 1, it will be disabled otherwise. h](h)}(hoptimistic_dad - BOOLEANh]hoptimistic_dad - BOOLEAN}(hjfhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjfubh)}(hhh](j)}(hEWhether to perform Optimistic Duplicate Address Detection (RFC 4429).h]hEWhether to perform Optimistic Duplicate Address Detection (RFC 4429).}(hjfhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjfubh)}(hhh](j)}(h0: disabled (default)h]j)}(hjfh]h0: disabled (default)}(hjfhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjfubah}(h]h ]h"]h$]h&]uh1hhjfubj)}(h 1: enabled h]j)}(h 1: enabledh]h 1: enabled}(hjfhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjfubah}(h]h ]h"]h$]h&]uh1hhjfubeh}(h]h ]h"]h$]h&]j8jXuh1hhhhM hjfubj)}(hOptimistic Duplicate Address Detection for the interface will be enabled if at least one of conf/{all,interface}/optimistic_dad is set to 1, it will be disabled otherwise.h]hOptimistic Duplicate Address Detection for the interface will be enabled if at least one of conf/{all,interface}/optimistic_dad is set to 1, it will be disabled otherwise.}(hjfhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjfubeh}(h]h ]h"]h$]h&]uh1hhjfubeh}(h]h ]h"]h$]h&]uh1hhhhM hjsPhhubh)}(hXuse_optimistic - BOOLEAN If enabled, do not classify optimistic addresses as deprecated during source address selection. Preferred addresses will still be chosen before optimistic addresses, subject to other ranking in the source address selection algorithm. * 0: disabled (default) * 1: enabled This will be enabled if at least one of conf/{all,interface}/use_optimistic is set to 1, disabled otherwise. h](h)}(huse_optimistic - BOOLEANh]huse_optimistic - BOOLEAN}(hjghhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjgubh)}(hhh](j)}(hIf enabled, do not classify optimistic addresses as deprecated during source address selection. Preferred addresses will still be chosen before optimistic addresses, subject to other ranking in the source address selection algorithm.h]hIf enabled, do not classify optimistic addresses as deprecated during source address selection. Preferred addresses will still be chosen before optimistic addresses, subject to other ranking in the source address selection algorithm.}(hj'ghhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj$gubh)}(hhh](j)}(h0: disabled (default)h]j)}(hj:gh]h0: disabled (default)}(hj hjkubh)}(hhh](j)}(hIf set non-zero, then the kernel will ignore all ICMP ECHO requests sent to it over the IPv6 protocol destined to anycast address.h]hIf set non-zero, then the kernel will ignore all ICMP ECHO requests sent to it over the IPv6 protocol destined to anycast address.}(hjkhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM; hjkubj)}(h Default: 0h]h Default: 0}(hjkhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM> hjkubeh}(h]h ]h"]h$]h&]uh1hhjkubeh}(h]h ]h"]h$]h&]uh1hhhhM> hjjhhubh)}(herror_anycast_as_unicast - BOOLEAN If set to 1, then the kernel will respond with ICMP Errors resulting from requests sent to it over the IPv6 protocol destined to anycast address essentially treating anycast as unicast. Default: 0 h](h)}(h"error_anycast_as_unicast - BOOLEANh]h"error_anycast_as_unicast - BOOLEAN}(hj lhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhME hjlubh)}(hhh](j)}(hIf set to 1, then the kernel will respond with ICMP Errors resulting from requests sent to it over the IPv6 protocol destined to anycast address essentially treating anycast as unicast.h]hIf set to 1, then the kernel will respond with ICMP Errors resulting from requests sent to it over the IPv6 protocol destined to anycast address essentially treating anycast as unicast.}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMA hjlubj)}(h Default: 0h]h Default: 0}(hj+lhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhME hjlubeh}(h]h ]h"]h$]h&]uh1hhjlubeh}(h]h ]h"]h$]h&]uh1hhhhME hjjhhubh)}(hxfrm6_gc_thresh - INTEGER (Obsolete since linux-4.14) The threshold at which we will start garbage collecting for IPv6 destination cache entries. At twice this value the system will refuse new allocations. h](h)}(hxfrm6_gc_thresh - INTEGERh]hxfrm6_gc_thresh - INTEGER}(hjIlhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhML hjElubh)}(hhh]j)}(h(Obsolete since linux-4.14) The threshold at which we will start garbage collecting for IPv6 destination cache entries. At twice this value the system will refuse new allocations.h]h(Obsolete since linux-4.14) The threshold at which we will start garbage collecting for IPv6 destination cache entries. At twice this value the system will refuse new allocations.}(hjZlhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMH hjWlubah}(h]h ]h"]h$]h&]uh1hhjElubeh}(h]h ]h"]h$]h&]uh1hhhhML hjjhhubeh}(h]h ]h"]h$]h&]uh1hhjxjhhhhhNubj)}(hlIPv6 Update by: Pekka Savola YOSHIFUJI Hideaki / USAGI Project h](hIPv6 Update by: Pekka Savola <}(hjzlhhhNhNubj')}(hpekkas@netcore.fih]hpekkas@netcore.fi}(hjlhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:pekkas@netcore.fiuh1j'hjzlubh%> YOSHIFUJI Hideaki / USAGI Project <}(hjzlhhhNhNubj')}(hyoshfuji@linux-ipv6.orgh]hyoshfuji@linux-ipv6.org}(hjlhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:yoshfuji@linux-ipv6.orguh1j'hjzlubh>}(hjzlhhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhMN hjxjhhubeh}(h]icmpah ]h"]icmp/*:ah$]h&]uh1hhhhhhhhM ubh)}(hhh](h)}(h!/proc/sys/net/bridge/* Variables:h]h!/proc/sys/net/bridge/* Variables:}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjlhhhhhMT ubh)}(hhh](h)}(hbridge-nf-call-arptables - BOOLEAN - 1 : pass bridged ARP traffic to arptables' FORWARD chain. - 0 : disable this. Default: 1 h](h)}(h"bridge-nf-call-arptables - BOOLEANh]h"bridge-nf-call-arptables - BOOLEAN}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMZ hjlubh)}(hhh](h)}(hhh](j)}(h91 : pass bridged ARP traffic to arptables' FORWARD chain.h]j)}(hjlh]h;1 : pass bridged ARP traffic to arptables’ FORWARD chain.}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMW hjlubah}(h]h ]h"]h$]h&]uh1hhjlubj)}(h0 : disable this. h]j)}(h0 : disable this.h]h0 : disable this.}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMX hjlubah}(h]h ]h"]h$]h&]uh1hhjlubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMW hjlubj)}(h Default: 1h]h Default: 1}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMZ hjlubeh}(h]h ]h"]h$]h&]uh1hhjlubeh}(h]h ]h"]h$]h&]uh1hhhhMZ hjlubh)}(hwbridge-nf-call-iptables - BOOLEAN - 1 : pass bridged IPv4 traffic to iptables' chains. - 0 : disable this. Default: 1 h](h)}(h!bridge-nf-call-iptables - BOOLEANh]h!bridge-nf-call-iptables - BOOLEAN}(hj7mhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM` hj3mubh)}(hhh](h)}(hhh](j)}(h21 : pass bridged IPv4 traffic to iptables' chains.h]j)}(hjMmh]h41 : pass bridged IPv4 traffic to iptables’ chains.}(hjOmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM] hjKmubah}(h]h ]h"]h$]h&]uh1hhjHmubj)}(h0 : disable this. h]j)}(h0 : disable this.h]h0 : disable this.}(hjfmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM^ hjbmubah}(h]h ]h"]h$]h&]uh1hhjHmubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM] hjEmubj)}(h Default: 1h]h Default: 1}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM` hjEmubeh}(h]h ]h"]h$]h&]uh1hhj3mubeh}(h]h ]h"]h$]h&]uh1hhhhM` hjlhhubh)}(hybridge-nf-call-ip6tables - BOOLEAN - 1 : pass bridged IPv6 traffic to ip6tables' chains. - 0 : disable this. Default: 1 h](h)}(h"bridge-nf-call-ip6tables - BOOLEANh]h"bridge-nf-call-ip6tables - BOOLEAN}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMf hjmubh)}(hhh](h)}(hhh](j)}(h31 : pass bridged IPv6 traffic to ip6tables' chains.h]j)}(hjmh]h51 : pass bridged IPv6 traffic to ip6tables’ chains.}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMc hjmubah}(h]h ]h"]h$]h&]uh1hhjmubj)}(h0 : disable this. h]j)}(h0 : disable this.h]h0 : disable this.}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMd hjmubah}(h]h ]h"]h$]h&]uh1hhjmubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMc hjmubj)}(h Default: 1h]h Default: 1}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMf hjmubeh}(h]h ]h"]h$]h&]uh1hhjmubeh}(h]h ]h"]h$]h&]uh1hhhhMf hjlhhubh)}(hbridge-nf-filter-vlan-tagged - BOOLEAN - 1 : pass bridged vlan-tagged ARP/IP/IPv6 traffic to {arp,ip,ip6}tables. - 0 : disable this. Default: 0 h](h)}(h&bridge-nf-filter-vlan-tagged - BOOLEANh]h&bridge-nf-filter-vlan-tagged - BOOLEAN}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMl hjnubh)}(hhh](h)}(hhh](j)}(hG1 : pass bridged vlan-tagged ARP/IP/IPv6 traffic to {arp,ip,ip6}tables.h]j)}(hjnh]hG1 : pass bridged vlan-tagged ARP/IP/IPv6 traffic to {arp,ip,ip6}tables.}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMi hjnubah}(h]h ]h"]h$]h&]uh1hhjnubj)}(h0 : disable this. h]j)}(h0 : disable this.h]h0 : disable this.}(hj4nhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMj hj0nubah}(h]h ]h"]h$]h&]uh1hhjnubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMi hjnubj)}(h Default: 0h]h Default: 0}(hjNnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMl hjnubeh}(h]h ]h"]h$]h&]uh1hhjnubeh}(h]h ]h"]h$]h&]uh1hhhhMl hjlhhubh)}(hbridge-nf-filter-pppoe-tagged - BOOLEAN - 1 : pass bridged pppoe-tagged IP/IPv6 traffic to {ip,ip6}tables. - 0 : disable this. Default: 0 h](h)}(h'bridge-nf-filter-pppoe-tagged - BOOLEANh]h'bridge-nf-filter-pppoe-tagged - BOOLEAN}(hjlnhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMr hjhnubh)}(hhh](h)}(hhh](j)}(h@1 : pass bridged pppoe-tagged IP/IPv6 traffic to {ip,ip6}tables.h]j)}(hjnh]h@1 : pass bridged pppoe-tagged IP/IPv6 traffic to {ip,ip6}tables.}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMo hjnubah}(h]h ]h"]h$]h&]uh1hhj}nubj)}(h0 : disable this. h]j)}(h0 : disable this.h]h0 : disable this.}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMp hjnubah}(h]h ]h"]h$]h&]uh1hhj}nubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMo hjznubj)}(h Default: 0h]h Default: 0}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMr hjznubeh}(h]h ]h"]h$]h&]uh1hhjhnubeh}(h]h ]h"]h$]h&]uh1hhhhMr hjlhhubh)}(hXbridge-nf-pass-vlan-input-dev - BOOLEAN - 1: if bridge-nf-filter-vlan-tagged is enabled, try to find a vlan interface on the bridge and set the netfilter input device to the vlan. This allows use of e.g. "iptables -i br0.1" and makes the REDIRECT target work with vlan-on-top-of-bridge interfaces. When no matching vlan interface is found, or this switch is off, the input device is set to the bridge interface. - 0: disable bridge netfilter vlan interface lookup. Default: 0 h](h)}(h'bridge-nf-pass-vlan-input-dev - BOOLEANh]h'bridge-nf-pass-vlan-input-dev - BOOLEAN}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM~ hjnubh)}(hhh](h)}(hhh](j)}(hXs1: if bridge-nf-filter-vlan-tagged is enabled, try to find a vlan interface on the bridge and set the netfilter input device to the vlan. This allows use of e.g. "iptables -i br0.1" and makes the REDIRECT target work with vlan-on-top-of-bridge interfaces. When no matching vlan interface is found, or this switch is off, the input device is set to the bridge interface. h]j)}(hXr1: if bridge-nf-filter-vlan-tagged is enabled, try to find a vlan interface on the bridge and set the netfilter input device to the vlan. This allows use of e.g. "iptables -i br0.1" and makes the REDIRECT target work with vlan-on-top-of-bridge interfaces. When no matching vlan interface is found, or this switch is off, the input device is set to the bridge interface.h]hXv1: if bridge-nf-filter-vlan-tagged is enabled, try to find a vlan interface on the bridge and set the netfilter input device to the vlan. This allows use of e.g. “iptables -i br0.1” and makes the REDIRECT target work with vlan-on-top-of-bridge interfaces. When no matching vlan interface is found, or this switch is off, the input device is set to the bridge interface.}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMu hjnubah}(h]h ]h"]h$]h&]uh1hhjnubj)}(h30: disable bridge netfilter vlan interface lookup. h]j)}(h20: disable bridge netfilter vlan interface lookup.h]h20: disable bridge netfilter vlan interface lookup.}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM| hjnubah}(h]h ]h"]h$]h&]uh1hhjnubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMu hjnubj)}(h Default: 0h]h Default: 0}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM~ hjnubeh}(h]h ]h"]h$]h&]uh1hhjnubeh}(h]h ]h"]h$]h&]uh1hhhhM~ hjlhhubeh}(h]h ]h"]h$]h&]uh1hhjlhhhhhNubeh}(h]proc-sys-net-bridge-variablesah ]h"]!/proc/sys/net/bridge/* variables:ah$]h&]uh1hhhhhhhhMT ubh)}(hhh](h)}(h"``proc/sys/net/sctp/*`` Variables:h](jq7)}(h``proc/sys/net/sctp/*``h]hproc/sys/net/sctp/*}(hjLohhhNhNubah}(h]h ]h"]h$]h&]uh1jp7hjHoubh Variables:}(hjHohhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjEohhhhhM ubh)}(hhh](h)}(hX)addip_enable - BOOLEAN Enable or disable extension of Dynamic Address Reconfiguration (ADD-IP) functionality specified in RFC5061. This extension provides the ability to dynamically add and remove new addresses for the SCTP associations. 1: Enable extension. 0: Disable extension. Default: 0 h](h)}(haddip_enable - BOOLEANh]haddip_enable - BOOLEAN}(hjkohhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjgoubh)}(hhh](j)}(hEnable or disable extension of Dynamic Address Reconfiguration (ADD-IP) functionality specified in RFC5061. This extension provides the ability to dynamically add and remove new addresses for the SCTP associations.h]hEnable or disable extension of Dynamic Address Reconfiguration (ADD-IP) functionality specified in RFC5061. This extension provides the ability to dynamically add and remove new addresses for the SCTP associations.}(hj|ohhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyoubj)}(h1: Enable extension.h]h1: Enable extension.}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyoubj)}(h0: Disable extension.h]h0: Disable extension.}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyoubj)}(h Default: 0h]h Default: 0}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyoubeh}(h]h ]h"]h$]h&]uh1hhjgoubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdoubh)}(hXpf_enable - INTEGER Enable or disable pf (pf is short for potentially failed) state. A value of pf_retrans > path_max_retrans also disables pf state. That is, one of both pf_enable and pf_retrans > path_max_retrans can disable pf state. Since pf_retrans and path_max_retrans can be changed by userspace application, sometimes user expects to disable pf state by the value of pf_retrans > path_max_retrans, but occasionally the value of pf_retrans or path_max_retrans is changed by the user application, this pf state is enabled. As such, it is necessary to add this to dynamically enable and disable pf state. See: https://datatracker.ietf.org/doc/draft-ietf-tsvwg-sctp-failover for details. 1: Enable pf. 0: Disable pf. Default: 1 h](h)}(hpf_enable - INTEGERh]hpf_enable - INTEGER}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjoubh)}(hhh](j)}(hXEnable or disable pf (pf is short for potentially failed) state. A value of pf_retrans > path_max_retrans also disables pf state. That is, one of both pf_enable and pf_retrans > path_max_retrans can disable pf state. Since pf_retrans and path_max_retrans can be changed by userspace application, sometimes user expects to disable pf state by the value of pf_retrans > path_max_retrans, but occasionally the value of pf_retrans or path_max_retrans is changed by the user application, this pf state is enabled. As such, it is necessary to add this to dynamically enable and disable pf state. See: https://datatracker.ietf.org/doc/draft-ietf-tsvwg-sctp-failover for details.h](hXSEnable or disable pf (pf is short for potentially failed) state. A value of pf_retrans > path_max_retrans also disables pf state. That is, one of both pf_enable and pf_retrans > path_max_retrans can disable pf state. Since pf_retrans and path_max_retrans can be changed by userspace application, sometimes user expects to disable pf state by the value of pf_retrans > path_max_retrans, but occasionally the value of pf_retrans or path_max_retrans is changed by the user application, this pf state is enabled. As such, it is necessary to add this to dynamically enable and disable pf state. See: }(hjohhhNhNubj')}(h?https://datatracker.ietf.org/doc/draft-ietf-tsvwg-sctp-failoverh]h?https://datatracker.ietf.org/doc/draft-ietf-tsvwg-sctp-failover}(hjohhhNhNubah}(h]h ]h"]h$]h&]refurijouh1j'hjoubh for details.}(hjohhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM hjoubj)}(h 1: Enable pf.h]h 1: Enable pf.}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjoubj)}(h0: Disable pf.h]h0: Disable pf.}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjoubj)}(h Default: 1h]h Default: 1}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjoubeh}(h]h ]h"]h$]h&]uh1hhjoubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hXpf_expose - INTEGER Unset or enable/disable pf (pf is short for potentially failed) state exposure. Applications can control the exposure of the PF path state in the SCTP_PEER_ADDR_CHANGE event and the SCTP_GET_PEER_ADDR_INFO sockopt. When it's unset, no SCTP_PEER_ADDR_CHANGE event with SCTP_ADDR_PF state will be sent and a SCTP_PF-state transport info can be got via SCTP_GET_PEER_ADDR_INFO sockopt; When it's enabled, a SCTP_PEER_ADDR_CHANGE event will be sent for a transport becoming SCTP_PF state and a SCTP_PF-state transport info can be got via SCTP_GET_PEER_ADDR_INFO sockopt; When it's disabled, no SCTP_PEER_ADDR_CHANGE event will be sent and it returns -EACCES when trying to get a SCTP_PF-state transport info via SCTP_GET_PEER_ADDR_INFO sockopt. 0: Unset pf state exposure, Compatible with old applications. 1: Disable pf state exposure. 2: Enable pf state exposure. Default: 0 h](h)}(hpf_expose - INTEGERh]hpf_expose - INTEGER}(hj0phhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj,pubh)}(hhh](j)}(hXUnset or enable/disable pf (pf is short for potentially failed) state exposure. Applications can control the exposure of the PF path state in the SCTP_PEER_ADDR_CHANGE event and the SCTP_GET_PEER_ADDR_INFO sockopt. When it's unset, no SCTP_PEER_ADDR_CHANGE event with SCTP_ADDR_PF state will be sent and a SCTP_PF-state transport info can be got via SCTP_GET_PEER_ADDR_INFO sockopt; When it's enabled, a SCTP_PEER_ADDR_CHANGE event will be sent for a transport becoming SCTP_PF state and a SCTP_PF-state transport info can be got via SCTP_GET_PEER_ADDR_INFO sockopt; When it's disabled, no SCTP_PEER_ADDR_CHANGE event will be sent and it returns -EACCES when trying to get a SCTP_PF-state transport info via SCTP_GET_PEER_ADDR_INFO sockopt.h]hXUnset or enable/disable pf (pf is short for potentially failed) state exposure. Applications can control the exposure of the PF path state in the SCTP_PEER_ADDR_CHANGE event and the SCTP_GET_PEER_ADDR_INFO sockopt. When it’s unset, no SCTP_PEER_ADDR_CHANGE event with SCTP_ADDR_PF state will be sent and a SCTP_PF-state transport info can be got via SCTP_GET_PEER_ADDR_INFO sockopt; When it’s enabled, a SCTP_PEER_ADDR_CHANGE event will be sent for a transport becoming SCTP_PF state and a SCTP_PF-state transport info can be got via SCTP_GET_PEER_ADDR_INFO sockopt; When it’s disabled, no SCTP_PEER_ADDR_CHANGE event will be sent and it returns -EACCES when trying to get a SCTP_PF-state transport info via SCTP_GET_PEER_ADDR_INFO sockopt.}(hjAphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj>pubj)}(h=0: Unset pf state exposure, Compatible with old applications.h]h=0: Unset pf state exposure, Compatible with old applications.}(hjOphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj>pubj)}(h1: Disable pf state exposure.h]h1: Disable pf state exposure.}(hj]phhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj>pubj)}(h2: Enable pf state exposure.h]h2: Enable pf state exposure.}(hjkphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj>pubj)}(h Default: 0h]h Default: 0}(hjyphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj>pubeh}(h]h ]h"]h$]h&]uh1hhj,pubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hXWaddip_noauth_enable - BOOLEAN Dynamic Address Reconfiguration (ADD-IP) requires the use of authentication to protect the operations of adding or removing new addresses. This requirement is mandated so that unauthorized hosts would not be able to hijack associations. However, older implementations may not have implemented this requirement while allowing the ADD-IP extension. For reasons of interoperability, we provide this variable to control the enforcement of the authentication requirement. == =============================================================== 1 Allow ADD-IP extension to be used without authentication. This should only be set in a closed environment for interoperability with older implementations. 0 Enforce the authentication requirement == =============================================================== Default: 0 h](h)}(haddip_noauth_enable - BOOLEANh]haddip_noauth_enable - BOOLEAN}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjpubh)}(hhh](j)}(hXDynamic Address Reconfiguration (ADD-IP) requires the use of authentication to protect the operations of adding or removing new addresses. This requirement is mandated so that unauthorized hosts would not be able to hijack associations. However, older implementations may not have implemented this requirement while allowing the ADD-IP extension. For reasons of interoperability, we provide this variable to control the enforcement of the authentication requirement.h]hXDynamic Address Reconfiguration (ADD-IP) requires the use of authentication to protect the operations of adding or removing new addresses. This requirement is mandated so that unauthorized hosts would not be able to hijack associations. However, older implementations may not have implemented this requirement while allowing the ADD-IP extension. For reasons of interoperability, we provide this variable to control the enforcement of the authentication requirement.}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjpubj[)}(hhh]j`)}(hhh](je)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jdhjpubje)}(hhh]h}(h]h ]h"]h$]h&]colwidthK?uh1jdhjpubj{)}(hhh](j)}(hhh](j)}(hhh]j)}(hjh]h1}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjpubah}(h]h ]h"]h$]h&]uh1jhjpubj)}(hhh]j)}(hAllow ADD-IP extension to be used without authentication. This should only be set in a closed environment for interoperability with older implementations.h]hAllow ADD-IP extension to be used without authentication. This should only be set in a closed environment for interoperability with older implementations.}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjpubah}(h]h ]h"]h$]h&]uh1jhjpubeh}(h]h ]h"]h$]h&]uh1jhjpubj)}(hhh](j)}(hhh]j)}(hjh]h0}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj qubah}(h]h ]h"]h$]h&]uh1jhj qubj)}(hhh]j)}(h&Enforce the authentication requirementh]h&Enforce the authentication requirement}(hj%qhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj"qubah}(h]h ]h"]h$]h&]uh1jhj qubeh}(h]h ]h"]h$]h&]uh1jhjpubeh}(h]h ]h"]h$]h&]uh1jzhjpubeh}(h]h ]h"]h$]h&]colsKuh1j_hjpubah}(h]h ]h"]h$]h&]uh1jZhjpubj)}(h Default: 0h]h Default: 0}(hjRqhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjpubeh}(h]h ]h"]h$]h&]uh1hhjpubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hX8auth_enable - BOOLEAN Enable or disable Authenticated Chunks extension. This extension provides the ability to send and receive authenticated chunks and is required for secure operation of Dynamic Address Reconfiguration (ADD-IP) extension. - 1: Enable this extension. - 0: Disable this extension. Default: 0 h](h)}(hauth_enable - BOOLEANh]hauth_enable - BOOLEAN}(hjpqhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjlqubh)}(hhh](j)}(hEnable or disable Authenticated Chunks extension. This extension provides the ability to send and receive authenticated chunks and is required for secure operation of Dynamic Address Reconfiguration (ADD-IP) extension.h]hEnable or disable Authenticated Chunks extension. This extension provides the ability to send and receive authenticated chunks and is required for secure operation of Dynamic Address Reconfiguration (ADD-IP) extension.}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj~qubh)}(hhh](j)}(h1: Enable this extension.h]j)}(hjqh]h1: Enable this extension.}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjqubah}(h]h ]h"]h$]h&]uh1hhjqubj)}(h0: Disable this extension. nh]j)}(h0: Disable this extension.h]h0: Disable this extension.}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjqubah}(h]h ]h"]h$]h&]uh1hhjqubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hj~qubj)}(h Default: 0h]h Default: 0}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj~qubeh}(h]h ]h"]h$]h&]uh1hhjlqubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hprsctp_enable - BOOLEAN Enable or disable the Partial Reliability extension (RFC3758) which is used to notify peers that a given DATA should no longer be expected. - 1: Enable extension - 0: Disable Default: 1 h](h)}(hprsctp_enable - BOOLEANh]hprsctp_enable - BOOLEAN}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjqubh)}(hhh](j)}(hEnable or disable the Partial Reliability extension (RFC3758) which is used to notify peers that a given DATA should no longer be expected.h]hEnable or disable the Partial Reliability extension (RFC3758) which is used to notify peers that a given DATA should no longer be expected.}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjqubh)}(hhh](j)}(h1: Enable extensionh]j)}(hj rh]h1: Enable extension}(hj rhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjrubah}(h]h ]h"]h$]h&]uh1hhjrubj)}(h 0: Disable h]j)}(h 0: Disableh]h 0: Disable}(hj"rhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjrubah}(h]h ]h"]h$]h&]uh1hhjrubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hjqubj)}(h Default: 1h]h Default: 1}(hj path_max_retrans disables this feature. Since both pf_retrans and path_max_retrans can be changed by userspace application, a variable pf_enable is used to disable pf state. Default: 0 h](h)}(hpf_retrans - INTEGERh]hpf_retrans - INTEGER}(hjNshhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjJsubh)}(hhh](j)}(hXThe number of retransmissions that will be attempted on a given path before traffic is redirected to an alternate transport (should one exist). Note this is distinct from path_max_retrans, as a path that passes the pf_retrans threshold can still be used. Its only deprioritized when a transmission path is selected by the stack. This setting is primarily used to enable fast failover mechanisms without having to reduce path_max_retrans to a very low value. See: http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt for details. Note also that a value of pf_retrans > path_max_retrans disables this feature. Since both pf_retrans and path_max_retrans can be changed by userspace application, a variable pf_enable is used to disable pf state.h](hXThe number of retransmissions that will be attempted on a given path before traffic is redirected to an alternate transport (should one exist). Note this is distinct from path_max_retrans, as a path that passes the pf_retrans threshold can still be used. Its only deprioritized when a transmission path is selected by the stack. This setting is primarily used to enable fast failover mechanisms without having to reduce path_max_retrans to a very low value. See: }(hj_shhhNhNubj')}(h?http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txth]h?http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt}(hjgshhhNhNubah}(h]h ]h"]h$]h&]refurijisuh1j'hj_subh for details. Note also that a value of pf_retrans > path_max_retrans disables this feature. Since both pf_retrans and path_max_retrans can be changed by userspace application, a variable pf_enable is used to disable pf state.}(hj_shhhNhNubeh}(h]h ]h"]h$]h&]uh1jhhhM hj\subj)}(h Default: 0h]h Default: 0}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj\subeh}(h]h ]h"]h$]h&]uh1hhjJsubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hX^ps_retrans - INTEGER Primary.Switchover.Max.Retrans (PSMR), it's a tunable parameter coming from section-5 "Primary Path Switchover" in rfc7829. The primary path will be changed to another active path when the path error counter on the old primary path exceeds PSMR, so that "the SCTP sender is allowed to continue data transmission on a new working path even when the old primary destination address becomes active again". Note this feature is disabled by initializing 'ps_retrans' per netns as 0xffff by default, and its value can't be less than 'pf_retrans' when changing by sysctl. Default: 0xffff h](h)}(hps_retrans - INTEGERh]hps_retrans - INTEGER}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjsubh)}(hhh](j)}(hX7Primary.Switchover.Max.Retrans (PSMR), it's a tunable parameter coming from section-5 "Primary Path Switchover" in rfc7829. The primary path will be changed to another active path when the path error counter on the old primary path exceeds PSMR, so that "the SCTP sender is allowed to continue data transmission on a new working path even when the old primary destination address becomes active again". Note this feature is disabled by initializing 'ps_retrans' per netns as 0xffff by default, and its value can't be less than 'pf_retrans' when changing by sysctl.h]hXKPrimary.Switchover.Max.Retrans (PSMR), it’s a tunable parameter coming from section-5 “Primary Path Switchover” in rfc7829. The primary path will be changed to another active path when the path error counter on the old primary path exceeds PSMR, so that “the SCTP sender is allowed to continue data transmission on a new working path even when the old primary destination address becomes active again”. Note this feature is disabled by initializing ‘ps_retrans’ per netns as 0xffff by default, and its value can’t be less than ‘pf_retrans’ when changing by sysctl.}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjsubj)}(hDefault: 0xffffh]hDefault: 0xffff}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjsubeh}(h]h ]h"]h$]h&]uh1hhjsubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hrto_initial - INTEGER The initial round trip timeout value in milliseconds that will be used in calculating round trip times. This is the initial time interval for retransmissions. Default: 3000 h](h)}(hrto_initial - INTEGERh]hrto_initial - INTEGER}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjsubh)}(hhh](j)}(hThe initial round trip timeout value in milliseconds that will be used in calculating round trip times. This is the initial time interval for retransmissions.h]hThe initial round trip timeout value in milliseconds that will be used in calculating round trip times. This is the initial time interval for retransmissions.}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjsubj)}(h Default: 3000h]h Default: 3000}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjsubeh}(h]h ]h"]h$]h&]uh1hhjsubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hrto_max - INTEGER The maximum value (in milliseconds) of the round trip timeout. This is the largest time interval that can elapse between retransmissions. Default: 60000 h](h)}(hrto_max - INTEGERh]hrto_max - INTEGER}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM# hjtubh)}(hhh](j)}(hThe maximum value (in milliseconds) of the round trip timeout. This is the largest time interval that can elapse between retransmissions.h]hThe maximum value (in milliseconds) of the round trip timeout. This is the largest time interval that can elapse between retransmissions.}(hj)thhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj&tubj)}(hDefault: 60000h]hDefault: 60000}(hj7thhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM# hj&tubeh}(h]h ]h"]h$]h&]uh1hhjtubeh}(h]h ]h"]h$]h&]uh1hhhhM# hjdohhubh)}(hrto_min - INTEGER The minimum value (in milliseconds) of the round trip timeout. This is the smallest time interval the can elapse between retransmissions. Default: 1000 h](h)}(hrto_min - INTEGERh]hrto_min - INTEGER}(hjUthhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM) hjQtubh)}(hhh](j)}(hThe minimum value (in milliseconds) of the round trip timeout. This is the smallest time interval the can elapse between retransmissions.h]hThe minimum value (in milliseconds) of the round trip timeout. This is the smallest time interval the can elapse between retransmissions.}(hjfthhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM& hjctubj)}(h Default: 1000h]h Default: 1000}(hjtthhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM) hjctubeh}(h]h ]h"]h$]h&]uh1hhjQtubeh}(h]h ]h"]h$]h&]uh1hhhhM) hjdohhubh)}(hhb_interval - INTEGER The interval (in milliseconds) between HEARTBEAT chunks. These chunks are sent at the specified interval on idle paths to probe the state of a given path between 2 associations. Default: 30000 h](h)}(hhb_interval - INTEGERh]hhb_interval - INTEGER}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM0 hjtubh)}(hhh](j)}(hThe interval (in milliseconds) between HEARTBEAT chunks. These chunks are sent at the specified interval on idle paths to probe the state of a given path between 2 associations.h]hThe interval (in milliseconds) between HEARTBEAT chunks. These chunks are sent at the specified interval on idle paths to probe the state of a given path between 2 associations.}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM, hjtubj)}(hDefault: 30000h]hDefault: 30000}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM0 hjtubeh}(h]h ]h"]h$]h&]uh1hhjtubeh}(h]h ]h"]h$]h&]uh1hhhhM0 hjdohhubh)}(h|sack_timeout - INTEGER The amount of time (in milliseconds) that the implementation will wait to send a SACK. Default: 200 h](h)}(hsack_timeout - INTEGERh]hsack_timeout - INTEGER}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM6 hjtubh)}(hhh](j)}(hVThe amount of time (in milliseconds) that the implementation will wait to send a SACK.h]hVThe amount of time (in milliseconds) that the implementation will wait to send a SACK.}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM3 hjtubj)}(h Default: 200h]h Default: 200}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM6 hjtubeh}(h]h ]h"]h$]h&]uh1hhjtubeh}(h]h ]h"]h$]h&]uh1hhhhM6 hjdohhubh)}(hvalid_cookie_life - INTEGER The default lifetime of the SCTP cookie (in milliseconds). The cookie is used during association establishment. Default: 60000 h](h)}(hvalid_cookie_life - INTEGERh]hvalid_cookie_life - INTEGER}(hj uhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM< hjuubh)}(hhh](j)}(hpThe default lifetime of the SCTP cookie (in milliseconds). The cookie is used during association establishment.h]hpThe default lifetime of the SCTP cookie (in milliseconds). The cookie is used during association establishment.}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM9 hjuubj)}(hDefault: 60000h]hDefault: 60000}(hj+uhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM< hjuubeh}(h]h ]h"]h$]h&]uh1hhjuubeh}(h]h ]h"]h$]h&]uh1hhhhM< hjdohhubh)}(hcookie_preserve_enable - BOOLEAN Enable or disable the ability to extend the lifetime of the SCTP cookie that is used during the establishment phase of SCTP association - 1: Enable cookie lifetime extension. - 0: Disable Default: 1 h](h)}(h cookie_preserve_enable - BOOLEANh]h cookie_preserve_enable - BOOLEAN}(hjIuhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhME hjEuubh)}(hhh](j)}(hEnable or disable the ability to extend the lifetime of the SCTP cookie that is used during the establishment phase of SCTP associationh]hEnable or disable the ability to extend the lifetime of the SCTP cookie that is used during the establishment phase of SCTP association}(hjZuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM? hjWuubh)}(hhh](j)}(h$1: Enable cookie lifetime extension.h]j)}(hjmuh]h$1: Enable cookie lifetime extension.}(hjouhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMB hjkuubah}(h]h ]h"]h$]h&]uh1hhjhuubj)}(h 0: Disable h]j)}(h 0: Disableh]h 0: Disable}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMC hjuubah}(h]h ]h"]h$]h&]uh1hhjhuubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMB hjWuubj)}(h Default: 1h]h Default: 1}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhME hjWuubeh}(h]h ]h"]h$]h&]uh1hhjEuubeh}(h]h ]h"]h$]h&]uh1hhhhME hjdohhubh)}(hXcookie_hmac_alg - STRING Select the hmac algorithm used when generating the cookie value sent by a listening sctp socket to a connecting client in the INIT-ACK chunk. Valid values are: * md5 * sha1 * none Ability to assign md5 or sha1 as the selected alg is predicated on the configuration of those algorithms at build time (CONFIG_CRYPTO_MD5 and CONFIG_CRYPTO_SHA1). Default: Dependent on configuration. MD5 if available, else SHA1 if available, else none. h](h)}(hcookie_hmac_alg - STRINGh]hcookie_hmac_alg - STRING}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMU hjuubh)}(hhh](j)}(hSelect the hmac algorithm used when generating the cookie value sent by a listening sctp socket to a connecting client in the INIT-ACK chunk. Valid values are:h]hSelect the hmac algorithm used when generating the cookie value sent by a listening sctp socket to a connecting client in the INIT-ACK chunk. Valid values are:}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMH hjuubh)}(hhh](j)}(hmd5h]j)}(hjuh]hmd5}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhML hjuubah}(h]h ]h"]h$]h&]uh1hhjuubj)}(hsha1h]j)}(hjuh]hsha1}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMM hjuubah}(h]h ]h"]h$]h&]uh1hhjuubj)}(hnone h]j)}(hnoneh]hnone}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMN hjvubah}(h]h ]h"]h$]h&]uh1hhjuubeh}(h]h ]h"]h$]h&]j8jXuh1hhhhML hjuubj)}(hAbility to assign md5 or sha1 as the selected alg is predicated on the configuration of those algorithms at build time (CONFIG_CRYPTO_MD5 and CONFIG_CRYPTO_SHA1).h]hAbility to assign md5 or sha1 as the selected alg is predicated on the configuration of those algorithms at build time (CONFIG_CRYPTO_MD5 and CONFIG_CRYPTO_SHA1).}(hj,vhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMP hjuubj)}(hZDefault: Dependent on configuration. MD5 if available, else SHA1 if available, else none.h]hZDefault: Dependent on configuration. MD5 if available, else SHA1 if available, else none.}(hj:vhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMT hjuubeh}(h]h ]h"]h$]h&]uh1hhjuubeh}(h]h ]h"]h$]h&]uh1hhhhMU hjdohhubh)}(hXrcvbuf_policy - INTEGER Determines if the receive buffer is attributed to the socket or to association. SCTP supports the capability to create multiple associations on a single socket. When using this capability, it is possible that a single stalled association that's buffering a lot of data may block other associations from delivering their data by consuming all of the receive buffer space. To work around this, the rcvbuf_policy could be set to attribute the receiver buffer space to each association instead of the socket. This prevents the described blocking. - 1: rcvbuf space is per association - 0: rcvbuf space is per socket Default: 0 h](h)}(hrcvbuf_policy - INTEGERh]hrcvbuf_policy - INTEGER}(hjXvhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMe hjTvubh)}(hhh](j)}(hX#Determines if the receive buffer is attributed to the socket or to association. SCTP supports the capability to create multiple associations on a single socket. When using this capability, it is possible that a single stalled association that's buffering a lot of data may block other associations from delivering their data by consuming all of the receive buffer space. To work around this, the rcvbuf_policy could be set to attribute the receiver buffer space to each association instead of the socket. This prevents the described blocking.h]hX%Determines if the receive buffer is attributed to the socket or to association. SCTP supports the capability to create multiple associations on a single socket. When using this capability, it is possible that a single stalled association that’s buffering a lot of data may block other associations from delivering their data by consuming all of the receive buffer space. To work around this, the rcvbuf_policy could be set to attribute the receiver buffer space to each association instead of the socket. This prevents the described blocking.}(hjivhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMX hjfvubh)}(hhh](j)}(h"1: rcvbuf space is per associationh]j)}(hj|vh]h"1: rcvbuf space is per association}(hj~vhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMb hjzvubah}(h]h ]h"]h$]h&]uh1hhjwvubj)}(h0: rcvbuf space is per socket h]j)}(h0: rcvbuf space is per socketh]h0: rcvbuf space is per socket}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMc hjvubah}(h]h ]h"]h$]h&]uh1hhjwvubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMb hjfvubj)}(h Default: 0h]h Default: 0}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMe hjfvubeh}(h]h ]h"]h$]h&]uh1hhjTvubeh}(h]h ]h"]h$]h&]uh1hhhhMe hjdohhubh)}(hsndbuf_policy - INTEGER Similar to rcvbuf_policy above, this applies to send buffer space. - 1: Send buffer is tracked per association - 0: Send buffer is tracked per socket. Default: 0 h](h)}(hsndbuf_policy - INTEGERh]hsndbuf_policy - INTEGER}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMm hjvubh)}(hhh](j)}(hBSimilar to rcvbuf_policy above, this applies to send buffer space.h]hBSimilar to rcvbuf_policy above, this applies to send buffer space.}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMh hjvubh)}(hhh](j)}(h)1: Send buffer is tracked per associationh]j)}(hjvh]h)1: Send buffer is tracked per association}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMj hjvubah}(h]h ]h"]h$]h&]uh1hhjvubj)}(h&0: Send buffer is tracked per socket. h]j)}(h%0: Send buffer is tracked per socket.h]h%0: Send buffer is tracked per socket.}(hj whhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMk hjwubah}(h]h ]h"]h$]h&]uh1hhjvubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhMj hjvubj)}(h Default: 0h]h Default: 0}(hj$whhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMm hjvubeh}(h]h ]h"]h$]h&]uh1hhjvubeh}(h]h ]h"]h$]h&]uh1hhhhMm hjdohhubh)}(hXsctp_mem - vector of 3 INTEGERs: min, pressure, max Number of pages allowed for queueing by all SCTP sockets. min: Below this number of pages SCTP is not bothered about its memory appetite. When amount of memory allocated by SCTP exceeds this number, SCTP starts to moderate memory usage. pressure: This value was introduced to follow format of tcp_mem. max: Number of pages allowed for queueing by all SCTP sockets. Default is calculated at boot time from amount of available memory. h](h)}(h3sctp_mem - vector of 3 INTEGERs: min, pressure, maxh]h3sctp_mem - vector of 3 INTEGERs: min, pressure, max}(hjBwhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMz hj>wubh)}(hhh](j)}(h9Number of pages allowed for queueing by all SCTP sockets.h]h9Number of pages allowed for queueing by all SCTP sockets.}(hjSwhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMp hjPwubj)}(hmin: Below this number of pages SCTP is not bothered about its memory appetite. When amount of memory allocated by SCTP exceeds this number, SCTP starts to moderate memory usage.h]hmin: Below this number of pages SCTP is not bothered about its memory appetite. When amount of memory allocated by SCTP exceeds this number, SCTP starts to moderate memory usage.}(hjawhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMr hjPwubj)}(h@pressure: This value was introduced to follow format of tcp_mem.h]h@pressure: This value was introduced to follow format of tcp_mem.}(hjowhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMv hjPwubj)}(h>max: Number of pages allowed for queueing by all SCTP sockets.h]h>max: Number of pages allowed for queueing by all SCTP sockets.}(hj}whhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMx hjPwubj)}(hCDefault is calculated at boot time from amount of available memory.h]hCDefault is calculated at boot time from amount of available memory.}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhMz hjPwubeh}(h]h ]h"]h$]h&]uh1hhj>wubeh}(h]h ]h"]h$]h&]uh1hhhhMz hjdohhubh)}(hX"sctp_rmem - vector of 3 INTEGERs: min, default, max Only the first value ("min") is used, "default" and "max" are ignored. min: Minimal size of receive buffer used by SCTP socket. It is guaranteed to each SCTP socket (but not association) even under moderate memory pressure. Default: 4K h](h)}(h3sctp_rmem - vector of 3 INTEGERs: min, default, maxh]h3sctp_rmem - vector of 3 INTEGERs: min, default, max}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjwubh)}(hhh](j)}(hFOnly the first value ("min") is used, "default" and "max" are ignored.h]hROnly the first value (“min”) is used, “default” and “max” are ignored.}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM} hjwubj)}(hmin: Minimal size of receive buffer used by SCTP socket. It is guaranteed to each SCTP socket (but not association) even under moderate memory pressure.h]hmin: Minimal size of receive buffer used by SCTP socket. It is guaranteed to each SCTP socket (but not association) even under moderate memory pressure.}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjwubj)}(h Default: 4Kh]h Default: 4K}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjwubeh}(h]h ]h"]h$]h&]uh1hhjwubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hX-sctp_wmem - vector of 3 INTEGERs: min, default, max Only the first value ("min") is used, "default" and "max" are ignored. min: Minimum size of send buffer that can be used by SCTP sockets. It is guaranteed to each SCTP socket (but not association) even under moderate memory pressure. Default: 4K h](h)}(h4sctp_wmem - vector of 3 INTEGERs: min, default, maxh]h4sctp_wmem - vector of 3 INTEGERs: min, default, max}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjwubh)}(hhh](j)}(hFOnly the first value ("min") is used, "default" and "max" are ignored.h]hROnly the first value (“min”) is used, “default” and “max” are ignored.}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubj)}(hmin: Minimum size of send buffer that can be used by SCTP sockets. It is guaranteed to each SCTP socket (but not association) even under moderate memory pressure.h]hmin: Minimum size of send buffer that can be used by SCTP sockets. It is guaranteed to each SCTP socket (but not association) even under moderate memory pressure.}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubj)}(h Default: 4Kh]h Default: 4K}(hj!xhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubeh}(h]h ]h"]h$]h&]uh1hhjwubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hX!addr_scope_policy - INTEGER Control IPv4 address scoping - draft-stewart-tsvwg-sctp-ipv4-00 - 0 - Disable IPv4 address scoping - 1 - Enable IPv4 address scoping - 2 - Follow draft but allow IPv4 private addresses - 3 - Follow draft but allow IPv4 link local addresses Default: 1 h](h)}(haddr_scope_policy - INTEGERh]haddr_scope_policy - INTEGER}(hj?xhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj;xubh)}(hhh](j)}(h?Control IPv4 address scoping - draft-stewart-tsvwg-sctp-ipv4-00h]h?Control IPv4 address scoping - draft-stewart-tsvwg-sctp-ipv4-00}(hjPxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjMxubh)}(hhh](j)}(h"0 - Disable IPv4 address scopingh]j)}(hjcxh]h"0 - Disable IPv4 address scoping}(hjexhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjaxubah}(h]h ]h"]h$]h&]uh1hhj^xubj)}(h!1 - Enable IPv4 address scopingh]j)}(hjzxh]h!1 - Enable IPv4 address scoping}(hj|xhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxxubah}(h]h ]h"]h$]h&]uh1hhj^xubj)}(h32 - Follow draft but allow IPv4 private addressesh]j)}(hjxh]h32 - Follow draft but allow IPv4 private addresses}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubah}(h]h ]h"]h$]h&]uh1hhj^xubj)}(h73 - Follow draft but allow IPv4 link local addresses h]j)}(h63 - Follow draft but allow IPv4 link local addressesh]h63 - Follow draft but allow IPv4 link local addresses}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubah}(h]h ]h"]h$]h&]uh1hhj^xubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hjMxubj)}(h Default: 1h]h Default: 1}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjMxubeh}(h]h ]h"]h$]h&]uh1hhj;xubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hXudp_port - INTEGER The listening port for the local UDP tunneling sock. Normally it's using the IANA-assigned UDP port number 9899 (sctp-tunneling). This UDP sock is used for processing the incoming UDP-encapsulated SCTP packets (from RFC6951), and shared by all applications in the same net namespace. This UDP sock will be closed when the value is set to 0. The value will also be used to set the src port of the UDP header for the outgoing UDP-encapsulated SCTP packets. For the dest port, please refer to 'encap_port' below. Default: 0 h](h)}(hudp_port - INTEGERh]hudp_port - INTEGER}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjxubh)}(hhh](j)}(hThe listening port for the local UDP tunneling sock. Normally it's using the IANA-assigned UDP port number 9899 (sctp-tunneling).h]hThe listening port for the local UDP tunneling sock. Normally it’s using the IANA-assigned UDP port number 9899 (sctp-tunneling).}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubj)}(hThis UDP sock is used for processing the incoming UDP-encapsulated SCTP packets (from RFC6951), and shared by all applications in the same net namespace. This UDP sock will be closed when the value is set to 0.h]hThis UDP sock is used for processing the incoming UDP-encapsulated SCTP packets (from RFC6951), and shared by all applications in the same net namespace. This UDP sock will be closed when the value is set to 0.}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubj)}(hThe value will also be used to set the src port of the UDP header for the outgoing UDP-encapsulated SCTP packets. For the dest port, please refer to 'encap_port' below.h]hThe value will also be used to set the src port of the UDP header for the outgoing UDP-encapsulated SCTP packets. For the dest port, please refer to ‘encap_port’ below.}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubj)}(h Default: 0h]h Default: 0}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjxubeh}(h]h ]h"]h$]h&]uh1hhjxubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hXsencap_port - INTEGER The default remote UDP encapsulation port. This value is used to set the dest port of the UDP header for the outgoing UDP-encapsulated SCTP packets by default. Users can also change the value for each sock/asoc/transport by using setsockopt. For further information, please refer to RFC6951. Note that when connecting to a remote server, the client should set this to the port that the UDP tunneling sock on the peer server is listening to and the local UDP tunneling sock on the client also must be started. On the server, it would get the encap_port from the incoming packet's source port. Default: 0 h](h)}(hencap_port - INTEGERh]hencap_port - INTEGER}(hj;yhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj7yubh)}(hhh](j)}(h*The default remote UDP encapsulation port.h]h*The default remote UDP encapsulation port.}(hjLyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjIyubj)}(hThis value is used to set the dest port of the UDP header for the outgoing UDP-encapsulated SCTP packets by default. Users can also change the value for each sock/asoc/transport by using setsockopt. For further information, please refer to RFC6951.h]hThis value is used to set the dest port of the UDP header for the outgoing UDP-encapsulated SCTP packets by default. Users can also change the value for each sock/asoc/transport by using setsockopt. For further information, please refer to RFC6951.}(hjZyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjIyubj)}(hX+Note that when connecting to a remote server, the client should set this to the port that the UDP tunneling sock on the peer server is listening to and the local UDP tunneling sock on the client also must be started. On the server, it would get the encap_port from the incoming packet's source port.h]hX-Note that when connecting to a remote server, the client should set this to the port that the UDP tunneling sock on the peer server is listening to and the local UDP tunneling sock on the client also must be started. On the server, it would get the encap_port from the incoming packet’s source port.}(hjhyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjIyubj)}(h Default: 0h]h Default: 0}(hjvyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjIyubeh}(h]h ]h"]h$]h&]uh1hhj7yubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hXplpmtud_probe_interval - INTEGER The time interval (in milliseconds) for the PLPMTUD probe timer, which is configured to expire after this period to receive an acknowledgment to a probe packet. This is also the time interval between the probes for the current pmtu when the probe search is done. PLPMTUD will be disabled when 0 is set, and other values for it must be >= 5000. Default: 0 h](h)}(h plpmtud_probe_interval - INTEGERh]h plpmtud_probe_interval - INTEGER}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjyubh)}(hhh](j)}(hXThe time interval (in milliseconds) for the PLPMTUD probe timer, which is configured to expire after this period to receive an acknowledgment to a probe packet. This is also the time interval between the probes for the current pmtu when the probe search is done.h]hXThe time interval (in milliseconds) for the PLPMTUD probe timer, which is configured to expire after this period to receive an acknowledgment to a probe packet. This is also the time interval between the probes for the current pmtu when the probe search is done.}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyubj)}(hPPLPMTUD will be disabled when 0 is set, and other values for it must be >= 5000.h]hPPLPMTUD will be disabled when 0 is set, and other values for it must be >= 5000.}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyubj)}(h Default: 0h]h Default: 0}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyubeh}(h]h ]h"]h$]h&]uh1hhjyubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hX]reconf_enable - BOOLEAN Enable or disable extension of Stream Reconfiguration functionality specified in RFC6525. This extension provides the ability to "reset" a stream, and it includes the Parameters of "Outgoing/Incoming SSN Reset", "SSN/TSN Reset" and "Add Outgoing/Incoming Streams". - 1: Enable extension. - 0: Disable extension. Default: 0 h](h)}(hreconf_enable - BOOLEANh]hreconf_enable - BOOLEAN}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjyubh)}(hhh](j)}(hXEnable or disable extension of Stream Reconfiguration functionality specified in RFC6525. This extension provides the ability to "reset" a stream, and it includes the Parameters of "Outgoing/Incoming SSN Reset", "SSN/TSN Reset" and "Add Outgoing/Incoming Streams".h]hXEnable or disable extension of Stream Reconfiguration functionality specified in RFC6525. This extension provides the ability to “reset” a stream, and it includes the Parameters of “Outgoing/Incoming SSN Reset”, “SSN/TSN Reset” and “Add Outgoing/Incoming Streams”.}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyubh)}(hhh](j)}(h1: Enable extension.h]j)}(hjzh]h1: Enable extension.}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjzubah}(h]h ]h"]h$]h&]uh1hhjyubj)}(h0: Disable extension. h]j)}(h0: Disable extension.h]h0: Disable extension.}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjzubah}(h]h ]h"]h$]h&]uh1hhjyubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hjyubj)}(h Default: 0h]h Default: 0}(hj6zhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjyubeh}(h]h ]h"]h$]h&]uh1hhjyubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hX"intl_enable - BOOLEAN Enable or disable extension of User Message Interleaving functionality specified in RFC8260. This extension allows the interleaving of user messages sent on different streams. With this feature enabled, I-DATA chunk will replace DATA chunk to carry user messages if also supported by the peer. Note that to use this feature, one needs to set this option to 1 and also needs to set socket options SCTP_FRAGMENT_INTERLEAVE to 2 and SCTP_INTERLEAVING_SUPPORTED to 1. - 1: Enable extension. - 0: Disable extension. Default: 0 h](h)}(hintl_enable - BOOLEANh]hintl_enable - BOOLEAN}(hjTzhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjPzubh)}(hhh](j)}(hXEnable or disable extension of User Message Interleaving functionality specified in RFC8260. This extension allows the interleaving of user messages sent on different streams. With this feature enabled, I-DATA chunk will replace DATA chunk to carry user messages if also supported by the peer. Note that to use this feature, one needs to set this option to 1 and also needs to set socket options SCTP_FRAGMENT_INTERLEAVE to 2 and SCTP_INTERLEAVING_SUPPORTED to 1.h]hXEnable or disable extension of User Message Interleaving functionality specified in RFC8260. This extension allows the interleaving of user messages sent on different streams. With this feature enabled, I-DATA chunk will replace DATA chunk to carry user messages if also supported by the peer. Note that to use this feature, one needs to set this option to 1 and also needs to set socket options SCTP_FRAGMENT_INTERLEAVE to 2 and SCTP_INTERLEAVING_SUPPORTED to 1.}(hjezhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjbzubh)}(hhh](j)}(h1: Enable extension.h]j)}(hjxzh]h1: Enable extension.}(hjzzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjvzubah}(h]h ]h"]h$]h&]uh1hhjszubj)}(h0: Disable extension. h]j)}(h0: Disable extension.h]h0: Disable extension.}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjzubah}(h]h ]h"]h$]h&]uh1hhjszubeh}(h]h ]h"]h$]h&]j8j9uh1hhhhM hjbzubj)}(h Default: 0h]h Default: 0}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjbzubeh}(h]h ]h"]h$]h&]uh1hhjPzubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hXlecn_enable - BOOLEAN Control use of Explicit Congestion Notification (ECN) by SCTP. Like in TCP, ECN is used only when both ends of the SCTP connection indicate support for it. This feature is useful in avoiding losses due to congestion by allowing supporting routers to signal congestion before having to drop packets. 1: Enable ecn. 0: Disable ecn. Default: 1 h](h)}(hecn_enable - BOOLEANh]hecn_enable - BOOLEAN}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjzubh)}(hhh](j)}(hX*Control use of Explicit Congestion Notification (ECN) by SCTP. Like in TCP, ECN is used only when both ends of the SCTP connection indicate support for it. This feature is useful in avoiding losses due to congestion by allowing supporting routers to signal congestion before having to drop packets.h]hX*Control use of Explicit Congestion Notification (ECN) by SCTP. Like in TCP, ECN is used only when both ends of the SCTP connection indicate support for it. This feature is useful in avoiding losses due to congestion by allowing supporting routers to signal congestion before having to drop packets.}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjzubj)}(h1: Enable ecn. 0: Disable ecn.h]h1: Enable ecn. 0: Disable ecn.}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjzubj)}(h Default: 1h]h Default: 1}(hjzhhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hjzubeh}(h]h ]h"]h$]h&]uh1hhjzubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubh)}(hX5l3mdev_accept - BOOLEAN Enabling this option allows a "global" bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV. Default: 1 (enabled) h](h)}(hl3mdev_accept - BOOLEANh]hl3mdev_accept - BOOLEAN}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj{ubh)}(hhh](j)}(hXEnabling this option allows a "global" bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV.h]hX Enabling this option allows a “global” bound socket to work across L3 master domains (e.g., VRFs) with packets capable of being received regardless of the L3 domain in which they originated. Only valid when the kernel was compiled with CONFIG_NET_L3_MASTER_DEV.}(hj%{hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj"{ubj)}(hDefault: 1 (enabled)h]hDefault: 1 (enabled)}(hj3{hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj"{ubeh}(h]h ]h"]h$]h&]uh1hhj{ubeh}(h]h ]h"]h$]h&]uh1hhhhM hjdohhubeh}(h]h ]h"]h$]h&]uh1hhjEohhhhhNubeh}(h]proc-sys-net-sctp-variablesah ]h"]proc/sys/net/sctp/* variables:ah$]h&]uh1hhhhhhhhM ubh)}(hhh](h)}(h``/proc/sys/net/core/*``h]jq7)}(hj`{h]h/proc/sys/net/core/*}(hjb{hhhNhNubah}(h]h ]h"]h$]h&]uh1jp7hj^{ubah}(h]h ]h"]h$]h&]uh1hhj[{hhhhhM ubj )}(hYPlease see: Documentation/admin-guide/sysctl/net.rst for descriptions of these entries. h]j)}(hWPlease see: Documentation/admin-guide/sysctl/net.rst for descriptions of these entries.h]hWPlease see: Documentation/admin-guide/sysctl/net.rst for descriptions of these entries.}(hjy{hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hju{ubah}(h]h ]h"]h$]h&]uh1j hhhM hj[{hhubeh}(h]proc-sys-net-coreah ]h"]/proc/sys/net/core/*ah$]h&]uh1hhhhhhhhM ubh)}(hhh](h)}(h``/proc/sys/net/unix/*``h]jq7)}(hj{h]h/proc/sys/net/unix/*}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1jp7hj{ubah}(h]h ]h"]h$]h&]uh1hhj{hhhhhM ubh)}(hhh]h)}(hWmax_dgram_qlen - INTEGER The maximum length of dgram socket receive queue Default: 10 h](h)}(hmax_dgram_qlen - INTEGERh]hmax_dgram_qlen - INTEGER}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj{ubh)}(hhh](j)}(h0The maximum length of dgram socket receive queueh]h0The maximum length of dgram socket receive queue}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj{ubj)}(h Default: 10h]h Default: 10}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1jhhhM hj{ubeh}(h]h ]h"]h$]h&]uh1hhj{ubeh}(h]h ]h"]h$]h&]uh1hhhhM hj{ubah}(h]h ]h"]h$]h&]uh1hhj{hhhhhNubeh}(h]proc-sys-net-unixah ]h"]/proc/sys/net/unix/*ah$]h&]uh1hhhhhhhhM ubeh}(h] ip-sysctlah ]h"] ip sysctlah$]h&]uh1hhhhhhhhKubeh}(h]h ]h"]h$]h&]sourcehuh1hcurrent_sourceN current_lineNsettingsdocutils.frontendValues)}(hN generatorN datestampN source_linkN source_urlN toc_backlinksjfootnote_backlinksK sectnum_xformKstrip_commentsNstrip_elements_with_classesN strip_classesN report_levelK halt_levelKexit_status_levelKdebugNwarning_streamN tracebackinput_encoding utf-8-siginput_encoding_error_handlerstrictoutput_encodingutf-8output_encoding_error_handlerj'|error_encodingutf-8error_encoding_error_handlerbackslashreplace language_codeenrecord_dependenciesNconfigN id_prefixhauto_id_prefixid dump_settingsNdump_internalsNdump_transformsNdump_pseudo_xmlNexpose_internalsNstrict_visitorN_disable_configN_sourceh _destinationN _config_files]7/var/lib/git/docbuild/linux/Documentation/docutils.confafile_insertion_enabled raw_enabledKline_length_limitM'pep_referencesN pep_base_urlhttps://peps.python.org/pep_file_url_templatepep-%04drfc_referencesN rfc_base_url&https://datatracker.ietf.org/doc/html/ tab_widthKtrim_footnote_reference_spacesyntax_highlightlong smart_quotessmartquotes_locales]character_level_inline_markupdoctitle_xform docinfo_xformKsectsubtitle_xform image_loadinglinkembed_stylesheetcloak_email_addressessection_self_linkenvNubreporterNindirect_targets]substitution_defs}substitution_names}refnames}1](j#2jn2j"3jh3esrefids}nameids}(j|j{j{ jx j* j' j)j)j+j+j/,j,,jE-jB-jEjEj5j32jujjrjjljljBoj?ojX{jU{j{j{j{j{u nametypes}(j|j{ j* j)j+j/,jE-jEj5jujjljBojX{j{j{uh}(j{hjx hj' j~ j)j- j+j)j,,j+jB-j2,jEjH-j-2j#2jx2jn2j,3j"3jr3jh3j32j4jrjjEjljxjj?ojljU{jEoj{j[{j{j{u footnote_refs}jg|](j#2jn2j"3jh3es citation_refs} autofootnotes]autofootnote_refs]symbol_footnotes]symbol_footnote_refs] footnotes]j4a citations]autofootnote_startKsymbol_footnote_startK id_counter collectionsCounter}j5|KsRparse_messages]transform_messages] transformerN include_log] decorationNhhub.