netdev - Re: [PATCH v2 net-next] ipv6: router reachability probing

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Date:	Wed, 11 Dec 2013 20:10:23 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Jiri Benc <jbenc@...hat.com>
Cc:	netdev@...r.kernel.org, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH v2 net-next] ipv6: router reachability probing

On Wed, Dec 11, 2013 at 01:48:20PM +0100, Jiri Benc wrote:
> RFC 4191 states in 3.5:
> 
>    When a host avoids using any non-reachable router X and instead sends
>    a data packet to another router Y, and the host would have used
>    router X if router X were reachable, then the host SHOULD probe each
>    such router X's reachability by sending a single Neighbor
>    Solicitation to that router's address.  A host MUST NOT probe a
>    router's reachability in the absence of useful traffic that the host
>    would have sent to the router if it were reachable.  In any case,
>    these probes MUST be rate-limited to no more than one per minute per
>    router.
> 
> Currently, when the neighbour corresponding to a router falls into
> NUD_FAILED, it's never considered again. Introduce a new rt6_nud_state
> value, RT6_NUD_FAIL_PROBE, which suggests the route should not be used but
> should be probed with a single NS. The probe is ratelimited by the existing
> code. To better distinguish meanings of the failure values, rename
> RT6_NUD_FAIL_SOFT to RT6_NUD_FAIL_DO_RR.
> 
> Signed-off-by: Jiri Benc <jbenc@...hat.com>

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Looks good, thanks!

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