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Message-Id: <20150813.212748.1239473674146629403.davem@davemloft.net>
Date: Thu, 13 Aug 2015 21:27:48 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: gospo@...ulusnetworks.com
Cc: netdev@...r.kernel.org, ddutt@...ulusnetworks.com
Subject: Re: [PATCH net-next v2 2/2] net: ipv6 sysctl option to ignore
routes when nexthop link is down
From: Andy Gospodarek <gospo@...ulusnetworks.com>
Date: Thu, 13 Aug 2015 10:39:01 -0400
> Like the ipv4 patch with a similar title, this adds a sysctl to allow
> the user to change routing behavior based on whether or not the
> interface associated with the nexthop was an up or down link. The
> default setting preserves the current behavior, but anyone that enables
> it will notice that nexthops on down interfaces will no longer be
> selected:
>
> net.ipv6.conf.all.ignore_routes_with_linkdown = 0
> net.ipv6.conf.default.ignore_routes_with_linkdown = 0
> net.ipv6.conf.lo.ignore_routes_with_linkdown = 0
> ...
>
> When the above sysctls are set, not only will link status be reported to
> userspace, but an indication that a nexthop is dead and will not be used
> is also reported.
>
> 1000::/8 via 7000::2 dev p7p1 metric 1024 dead linkdown pref medium
> 1000::/8 via 8000::2 dev p8p1 metric 1024 pref medium
> 7000::/8 dev p7p1 proto kernel metric 256 dead linkdown pref medium
> 8000::/8 dev p8p1 proto kernel metric 256 pref medium
> 9000::/8 via 8000::2 dev p8p1 metric 2048 pref medium
> 9000::/8 via 7000::2 dev p7p1 metric 1024 dead linkdown pref medium
> fe80::/64 dev p7p1 proto kernel metric 256 dead linkdown pref medium
> fe80::/64 dev p8p1 proto kernel metric 256 pref medium
>
> This also adds devconf support and notification when sysctl values
> change.
>
> v2: drop use of rt6i_nhflags since it is not needed right now
>
> Signed-off-by: Andy Gospodarek <gospo@...ulusnetworks.com>
> Signed-off-by: Dinesh Dutt <ddutt@...ulusnetworks.com>
Applied.
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