From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: Qestion about the Xen network?
Date: Sat, 23 Oct 2010 00:26:19 +0200
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On 10/22/2010 05:50 PM, Bei Guan wrote:
> My Dom0 (fedora 8) iptables /etc/sysconfig/iptables

This is only half of your configuration.  Libvirt is creating virbr0 and 
adding iptables rules to connect it to the outside world via NAT (the 
192.168.122.x subnet).  iptables -L can show those rules.

Paolo