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

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Message-ID: <4966160A.20001@haveacry.com>
Date:	Fri, 09 Jan 2009 00:04:42 +0900
From:	Speedster <speedster@...eacry.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	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

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

Download attachment "whimper-vlan50.cap" of type "application/octet-stream" (752 bytes)

Download attachment "whimper-vnet3.cap" of type "application/octet-stream" (744 bytes)

Download attachment "whinge-eth0.cap" of type "application/octet-stream" (744 bytes)

Download attachment "whinge-ppp0.cap" of type "application/octet-stream" (392 bytes)