netdev - Re: Possible networking regression in 3.6.0

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Date:	Mon, 01 Oct 2012 11:15:50 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Chris Clayton <chris2553@...glemail.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	gpiez@....de
Subject: Re: Possible networking regression in 3.6.0

On Mon, 2012-10-01 at 09:36 +0100, Chris Clayton wrote:
> 

>      0 ICMP messages received
>      0 input ICMP message failed.
>      ICMP input histogram:
>      0 ICMP messages sent
>      0 ICMP messages failed
>      ICMP output histogram:

> 
> After:
> 
> $ 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...

Could you send

iptables -t -nat -nvL
conntrack -L   # while ping is running from guest



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