[ovs-dev] [PATCH v2 4/4] Tunnel: Snoop ingress packets and update neigh cache if needed.

Flavio Leitner fbl at sysclose.org
Wed Nov 24 21:31:56 UTC 2021

On Wed, Nov 10, 2021 at 11:46:55AM +0100, Paolo Valerio wrote:
> In case of native tunnel with bfd enabled, if the MAC address of the
> remote end's interface changes (e.g. because it got rebooted, and the
> MAC address is allocated dynamically), the BFD session will never be
> re-established.
> This happens because the local tunnel neigh entry doesn't get updated,
> and the local end keeps sending BFD packets with the old destination
> MAC address. This was not an issue until
> b23ddcc57d41 ("tnl-neigh-cache: tighten arp and nd snooping.")
> because ARP requests were snooped as well avoiding the problem.
> Fix this by snooping the incoming packets in the slow path, and
> updating the neigh cache accordingly.
> Signed-off-by: Paolo Valerio <pvalerio at redhat.com>
> Fixes: b23ddcc57d41 ("tnl-neigh-cache: tighten arp and nd snooping.")
> Acked-by: Gaetan Rivet <grive at u256.net>
> ---

If you happen to respin the series, maybe you could add
the tag Reported-at: <bz url>.

Acked-by: Flavio Leitner <fbl at sysclose.org>

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