From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Koch <thomas@koch.ro>
Subject: Re: SOLVED kvm networking on debian unstable
Date: Thu, 17 Sep 2009 09:58:53 +0200
Message-ID: <200909170958.54075.thomas@koch.ro>
References: <200909162011.45845.thomas@koch.ro>
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The solution is, to delete 

/etc/udev/rules.d/70-persistent-net.rules

in the guest and reboot. This is an autogenerated file, which stores the 
mapping of MAC adresses to interface names. Since my MAC address changed, the 
interface wasn't automatically added anymore.

found at:
http://vmfaq.com/entry/24/

Thomas Koch, http://www.koch.ro