netdev - Re: Possible networking regression in 3.6.0

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Date:	Sun, 30 Sep 2012 21:45:30 +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 Sun, 2012-09-30 at 16:26 +0100, Chris Clayton wrote:
> Hi Eric,
> 
> On 09/28/12 12:26, Eric Dumazet wrote:
> > On Fri, 2012-09-28 at 10:22 +0100, Chris Clayton wrote:
> >
> >> No, the WinXP guest is configured with a fixed IP address
> >> (192.168.200.1). Subnet mask is 255.255.255.0, and default gateway is
> >> 192.168.200.254. DNS is 192.168.0.1.
> >>
> >
> > I have no problem with such a setup, with a linux guest.
> >
> > Could you send again a tcpdump, but including link-level header ?
> > (option -e)
> >
> > Ideally, you could send two traces, one taken on tap0, and another taken
> > on eth0.
> >
> Below are two more traces that I think may well be more useful than 
> those I sent on Friday. They are taken with tcpdump directly (after some 
> reading up on that application) rather than tcpdump translations of pcap 
> files captured with netsniff-ng. Also, they are taken concurrently, so 
> they show the traffic on tap0 and eth0 at the time of an unsuccessful 
> attempt to ping the router from the WinXP KVM client. The command was: 
> sudo tcpdump -nev -i eth0 -Z chris >eth0.trace


Could you send "netstat -s" before/after your tests ?



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