amitava@et-vmhost:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# the "metric" directives are used to specify the preferred interface
# lower values are higher priority

# The primary network interface
auto eth0
iface eth0 inet static
	address X.X.X.X
	netmask 255.255.255.128
	network X.X.X.X
	broadcast x.x.x.x
	gateway X.X.X.X
	# dns-* options are implemented by the resolvconf package, if installed
	dns-nameservers x.x.x.X X.X.X.X
	dns-search whatever.com
	metric 0

# configure the bridge for kvm

# eth1 will be the bridge port
# set it up, but provide further config in the bridge
auto eth1
iface eth1 inet manual

# configure bridging
auto br0

# configure the bridge using DHCP
iface br0 inet dhcp
	bridge_ports eth1
	bridge_stp off
	bridge_maxwait 0
	metric 10