Re: [Xen-users] Routing problem in bridged setup

To:	"Pepe Barbe" <elventear@xxxxxxxxx>
Subject:	Re: [Xen-users] Routing problem in bridged setup
From:	"Todd Deshane" <deshantm@xxxxxxxxx>
Date:	Fri, 9 May 2008 13:45:46 -0400
Cc:	xen-users@xxxxxxxxxxxxxxxxxxx
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So far can I can make the domU-firewall and domU-dmz talk to each other without problem. Using IPTables/NAT on domU-firewall I can route to the public internet from dom0/Local Lan and from the domU-dmz. But I can't communicate from the domU-dmz to local lan and viceversa. I've made sure that there are no IPTables rules blocking this kind of traffic, so all I am left is with the possiblity of a routing problem: domU-firewall not forwarding packets from the local lan to the dmz bridge for some reason.

Anyone has any idea of what could I do to troubleshoot this problem?

I just wanted to make sure that you are aware of the Ubuntu bugs:
https://bugs.launchpad.net/ubuntu/+source/xen-3.2/+bug/204010
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/218126

There are a number of troubleshooting techniques discuss in those bugs
including:

*using ethtool commands
*looking at the bridges in more detail with brctl commands etc.
*manually tracing the traffic with tools like wireshark and tcpdump
*any of general networking debugging that you can think of

Cheers,
Todd

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Re: [Xen-users] Routing problem in bridged setup