netdev - Re: Possible networking regression in 3.6.0

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Message-Id: <20121001.160115.1816241312626722150.davem@davemloft.net>
Date:	Mon, 01 Oct 2012 16:01:15 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	davej@...hat.com
Cc:	eric.dumazet@...il.com, chris2553@...glemail.com,
	netdev@...r.kernel.org, gpiez@....de
Subject: Re: Possible networking regression in 3.6.0

From: Dave Jones <davej@...hat.com>
Date: Mon, 1 Oct 2012 15:34:34 -0400

> On Mon, Oct 01, 2012 at 11:15:50AM +0200, Eric Dumazet wrote:
>  > > 
>  > > $ netstat -s
>  > > Icmp:
>  > >      4 ICMP messages received
>  > >      4 input ICMP message failed.
>  > >      ICMP input histogram:
>  > >          echo replies: 4
>  > 
>  > So icmp replies come back and are delivered to host instead of being
>  > forwarded.
>  > 
>  > I wonder if MASQUERADE broke...
> 
> I hit something that sounds just like this a few months back..
> http://lists.openwall.net/netdev/2012/07/25/53
> 
> It "went away" a few builds later, but I've seen it happen
> again from time to time.

Yep I remembe that report.

If you can find a way to more reliably trigger the case, that would
help us immensely.
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