If you want to get the ip using dhcp
#/etc/network/interfaces
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet dhcp
Or for a static IP
#/etc/network/interfaces
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
gateway 192.168.0.1
broadcast 192.168.0.255
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source:http://linuxpoison.blogspot.com/2008/07/135781758017960.html