netdev - Re: [Bugme-new] [Bug 12327] New: Intermittent TCP issues with => 2.6.27

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Date:	Thu, 8 Jan 2009 08:37:53 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Speedster <speedster@...eacry.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Netdev <netdev@...r.kernel.org>,
	bugme-daemon@...zilla.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Bugme-new] [Bug 12327] New: Intermittent TCP issues with =>
 2.6.27

On Fri, 09 Jan 2009 00:04:42 +0900
Speedster <speedster@...eacry.com> wrote:

> Herbert Xu wrote:
> > 
> > Can you please take a look at /proc/net/snmp on the host and the
> > guest to see if IP InDiscards is non-zero?
> 
> Both are 0
> 
> > Also now that we know the problem is definitely in the host/guest
> > please take another set of dumps on the interfaces leading to and
> > within the guest to see exactly which path of the system is dropping
> > the reply.
> 
> Attached (all are the exact same attempted connection), and reveal some 
> interesting information.
> 
> The path the inbound traffic should take is
> 1. vlan50 (host)
> 2. tap interface vnet3 (host) / eth0 (guest)
> 3. ppp0 (guest)
> 
> It looks as though when it is sent out the tap interface the payload 
> length is incorrect in the PPPoE section of the frame. When it arrives 
> via vlan50 it appears fine. Or at least that's what wireshark highlights 
> for me :)
> 
> Dean

Maybe there is an issue that GRO receive isn't handling padding
properly?
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