/proc/sys/net/conf//seg6_* variables: seg6_enabled - BOOL Accept or drop SR-enabled IPv6 packets on this interface. Relevant packets are those with SRH present and DA = local. 0 - disabled (default) not 0 - enabled seg6_require_hmac - INTEGER Define HMAC policy for ingress SR-enabled packets on this interface. -1 - Ignore HMAC field 0 - Accept SR packets without HMAC, validate SR packets with HMAC 1 - Drop SR packets without HMAC, validate SR packets with HMAC Default is 0.