# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto xenbr0
iface xenbr0 inet dhcp
    gateway 10.0.2.2
    bridge_ports eth0


auto eth0
iface eth0 inet dhcp
pre-up iptables-save < /etc/iptables.save
pre-up /etc/init.d/ebtables load