netdev - Re: IPV6 routing problem

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Date:	Wed, 22 Jan 2014 08:07:59 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Sharat Masetty <sharat04@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: IPV6 routing problem

Hi!

On Tue, Jan 21, 2014 at 06:41:58PM -0700, Sharat Masetty wrote:
>  I have an IPV6 routing problem that has only surfaced on a 3.10
> kernel version. This problem is not seen on 3.4 kernel. I will keep
> the problem statement as brief as possible.

Could you do me a favor and test this on a recent 3.13 kernel? Thanks!
Please also state the specific kernel version (I guess you use one).

> I have two interfaces say eth0 and eth1. I have a host route to a
> destination over eth1, but this route has a global gateway
> address(via) of the router on the link. When this global gateway is
> present in the route, the kernel does not seem to pick up the route,
> but falls back to the default route which is eth0. When this gateway
> is removed from the route or if the gateway is changed to a link local
> address of the router, instead of the global address, then routing
> seems to work as expected and kernel picks up interface eth1.
> 
> == does not work ==
> <dest-addr> via <global scope -gateway addr>dev eth1 metric 1024
> <global scope -gateway addr> dev eth1  metric 1024

Do you have CONFIG_IPV6_ROUTER_PREF activated?

> 
> I checked the git commits diff between 3.4 and 3.10 for ipv6/route.c
> and ipv6/ip6_fib.c, but looks like they are close to an year apart
> with lots of changes. Hence I wanted to reach out to you to see if any
> recent changes in IPV6 routing is causing this difference in behavior.

It should be a problem in ipv6/route.c, ip6_fib.c does not really care about
interfaces that much.

Thanks,

  Hannes

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