http://www.debian-administration.org/articles/470
http://www.gup.uni-linz.ac.at/xen/doc/network.php
http://felipe-alfaro.org/blog/2006/07/21/xen-network-configuration-and-multiple-vlans/
http://felipe-alfaro.org/blog/2006/08/21/xen-network-configuration-and-multiple-vlans-ii/
http://gundy.org/2006/10/24/xen-networking/
http://gundy.org/2006/12/18/more-xen-network-drawings/