This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-users] tcp checksum errors across dom0-domu bridge

To: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-users] tcp checksum errors across dom0-domu bridge
From: Daniel Goertzen <goertzen@xxxxxxxx>
Date: Wed, 28 Dec 2005 14:12:13 -0600
Cc: ian.pratt@xxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 28 Dec 2005 20:17:43 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <A95E2296287EAD4EB592B5DEEFCE0E9D409EC4@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <A95E2296287EAD4EB592B5DEEFCE0E9D409EC4@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)
Ian Pratt wrote:

No, dmesg looks clean in both dom0 and domU.  Sames results for
xen-3.0-testing-20051206 and xen-3.0-testing-20051227. (I only upgraded the hypervisor to 20051227.)

It's the dom0 and domU kernels that would need the upgrade as the
hypervisor isn't involved with this.

The other thing to try is to use ethtool to turn checksum offload off on


No progress:

- I used the dom0 and domU kernels from xen-3.0-testing-20051227, same results.
- I tried turning off the checksum offload for eth0, but it wouldn't let me.
- I removed my physical eth0 from the bridge so that the whole network was purely virtual... the tcp checksum problem still occurred. - I wrote a tiny python tcp client/server program that also fails because of the tcp checksum problem.

I'm willing to try more things if you can think of them.


Xen-users mailing list