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Re: [Xen-users] Migrating domUs behind a firewall backend domU

To: "Brian Stempin" <brian.stempin@xxxxxxxxx>
Subject: Re: [Xen-users] Migrating domUs behind a firewall backend domU
From: Jan Behrend <jbehrend@xxxxxxxxxxxxxxxxx>
Date: Wed, 23 Apr 2008 09:42:46 +0200
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Organization: Max-Planck-Institut für Radioastronomie
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On Wednesday 23 April 2008 09:01, you wrote:
> Whoops, forgot to post to the list:
> I'm just taking a totally blind stab, but here it goes:
> If I'm reading correctly, your Firewall DomU is providing NAT for the other
> DomUs.  Is the IP interface that faces the other DomUs the same IP on both
> machines?  IE, do ALL DomUs, regardless of physical machine, use the same
> gateway IP address?

Thanks for the answer.
The netbackend domUs are _not_ doing NAT.  They just keep unwanted traffic 
out.  If I flush all iptables rules and merely do forwarding on the 
netbackend domUs I get the same effect.
To answer your question: Yes, all domUs, regardless of their physical host, 
use the same gateway IP.  In fact all domUs and the physical machines are on 
the same subnet.


Jan Behrend
Max-Planck-Institut fuer Radioastronomie
Abteilung fuer Infrarot-Technologie
Auf dem Huegel 69, D-53121 Bonn (Germany)
Tel: (+49) 228 525 319, Fax: (+49) 228 525 411
jbehrend@xxxxxxxxxxxxxxxxx http://www.mpifr-bonn.mpg.de

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