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Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/ip-sysctl.rst | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index b0024aa7b051..433f2e4a5fed 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -2467,6 +2467,33 @@ drop_unsolicited_na - BOOLEAN By default this is turned off. +accept_unsolicited_na - BOOLEAN + Add a new neighbour cache entry in STALE state for routers on receiving an + unsolicited neighbour advertisement with target link-layer address option + specified. This is as per router-side behavior documented in RFC9131. + This has lower precedence than drop_unsolicited_na. + + ==== ====== ====== ============================================== + drop accept fwding behaviour + ---- ------ ------ ---------------------------------------------- + 1 X X Drop NA packet and don't pass up the stack + 0 0 X Pass NA packet up the stack, don't update NC + 0 1 0 Pass NA packet up the stack, don't update NC + 0 1 1 Pass NA packet up the stack, and add a STALE + NC entry + ==== ====== ====== ============================================== + + This will optimize the return path for the initial off-link communication + that is initiated by a directly connected host, by ensuring that + the first-hop router which turns on this setting doesn't have to + buffer the initial return packets to do neighbour-solicitation. + The prerequisite is that the host is configured to send + unsolicited neighbour advertisements on interface bringup. + This setting should be used in conjunction with the ndisc_notify setting + on the host to satisfy this prerequisite. + + By default this is turned off. + enhanced_dad - BOOLEAN Include a nonce option in the IPv6 neighbor solicitation messages used for duplicate address detection per RFC7527. A received DAD NS will only signal |