netdev - Re: IPv6 path MTU discovery broken

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Message-ID: <20131006124403.GA9295@order.stressinduktion.org>
Date:	Sun, 6 Oct 2013 14:44:03 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	"Steinar H. Gunderson" <sgunderson@...foot.com>
Cc:	netdev@...r.kernel.org, edumazet@...gle.com
Subject: Re: IPv6 path MTU discovery broken

On Sun, Oct 06, 2013 at 02:06:12PM +0200, Steinar H. Gunderson wrote:
> On Sat, Sep 28, 2013 at 10:33:18PM +0200, Hannes Frederic Sowa wrote:
> >> So the “packet too big” packets really look like they're being ignored.
> >> However, they _do_ reach the kernel somehow, since Icmp6InPktTooBigs
> >> seems to increase.
> >> 
> >> Could this be related somehow to the packets coming from 2001:67c:29f4::31,
> >> while the default route is to a link-local address? (An RPF issue?) This used
> >> to work (although it was often flaky for me) in 3.10 and before. I can't
> >> easily bisect, though, as I don't boot this machine too often.
> > This looks like a bug and should definitely get fixed. There should be
> > no RPF issue. May I have a look at your /proc/net/ipv6_route?
> 
> It started again, so now I could capture what you asked for:

Thanks!

Do you know which remote IP address is part in the failing communication? Same
as above?

Greetings,

  Hannes

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