.. SPDX-License-Identifier: GPL-2.0 ===================== MPTCP Sysfs variables ===================== /proc/sys/net/mptcp/* Variables =============================== enabled - BOOLEAN Control whether MPTCP sockets can be created. MPTCP sockets can be created if the value is 1. This is a per-namespace sysctl. Default: 1 (enabled) add_addr_timeout - INTEGER (seconds) Set the timeout after which an ADD_ADDR control message will be resent to an MPTCP peer that has not acknowledged a previous ADD_ADDR message. The default value matches TCP_RTO_MAX. This is a per-namespace sysctl. Default: 120 close_timeout - INTEGER (seconds) Set the make-after-break timeout: in absence of any close or shutdown syscall, MPTCP sockets will maintain the status unchanged for such time, after the last subflow removal, before moving to TCP_CLOSE. The default value matches TCP_TIMEWAIT_LEN. This is a per-namespace sysctl. Default: 60 checksum_enabled - BOOLEAN Control whether DSS checksum can be enabled. DSS checksum can be enabled if the value is nonzero. This is a per-namespace sysctl. Default: 0 allow_join_initial_addr_port - BOOLEAN Allow peers to send join requests to the IP address and port number used by the initial subflow if the value is 1. This controls a flag that is sent to the peer at connection time, and whether such join requests are accepted or denied. Joins to addresses advertised with ADD_ADDR are not affected by this value. This is a per-namespace sysctl. Default: 1 pm_type - INTEGER Set the default path manager type to use for each new MPTCP socket. In-kernel path management will control subflow connections and address advertisements according to per-namespace values configured over the MPTCP netlink API. Userspace path management puts per-MPTCP-connection subflow connection decisions and address advertisements under control of a privileged userspace program, at the cost of more netlink traffic to propagate all of the related events and commands. This is a per-namespace sysctl. * 0 - In-kernel path manager * 1 - Userspace path manager Default: 0 stale_loss_cnt - INTEGER The number of MPTCP-level retransmission intervals with no traffic and pending outstanding data on a given subflow required to declare it stale. The packet scheduler ignores stale subflows. A low stale_loss_cnt value allows for fast active-backup switch-over, an high value maximize links utilization on edge scenarios e.g. lossy link with high BER or peer pausing the data processing. This is a per-namespace sysctl. Default: 4 scheduler - STRING Select the scheduler of your choice. Support for selection of different schedulers. This is a per-namespace sysctl. Default: "default"