[Xen-users] TCP networking problem

[Harald Hetzner <harald.hetzner@xxxxxx>]

I'm using Xen 3.0.1 on Debian testing.

Besides the default xen-br0, I set up another bridge xen-br1. I created 
a domU to act as router between the two bridges. When I connect another 
domU to xen-br1, I can ping and traceroute into the network attached to 
xen-br0 and I get correct replies. But when I try to establish a 
TCP-connection, it fails all the time.
With tcpdump I found out, that the packets reach the destination and a 
reply is sent back. Unfortunatelly the packets do not leave xen-br0 by 
taking the interface to the router, but they leave via peth0 into my 
physical network where they get lost.
I have no idea why this happens or what I could do to prevent 
TCP-packets from leaving the bridge via the wrong network interface.
Anyone knows a solution to this strange problem?

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