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

To: "Daniel Goertzen" <goertzen@xxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] tcp checksum errors across dom0-domu bridge
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Tue, 27 Dec 2005 23:12:47 -0000
Cc: ian.pratt@xxxxxxxxxxxx
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Thread-index: AcYLOhVM7JknDNwBRBO4DCusT2DtdgAAL2zw
Thread-topic: [Xen-users] tcp checksum errors across dom0-domu bridge
> My xen setup is having trouble communicating between dom0 and 
> domu.  The dom0 and domUs have no problem communicating 
> outside the physical machine, and the domUs can even talk to 
> each other with no problems, but dom0-domU comms is a no-go.
> I am running gentoo x86 and xen-3.0.0.  The xend 
> network-bridge script didn't seem to work at all, so I 
> disabled it and use a bridge configured by gentoo (see dom0 
> network info below).  The domUs use vanilla xend bridge 
> networking (see dom1 network info below).
> Now the dom0 and domU can ping each other, and even establish 
> a tcp connection, but dom0->domU tcp packets always seem to 
> have a failing checksum. (see tcpdump trace of a telnet session below)

Are you getting 'insufficient headroom' message in the domU? (see

If so, upgrade to a newer 3.0.0 build number - the RPMs on the web site
should already be updated.


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