Example 1 - Static IP

# 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 primary network interface
auto eth0
iface eth0 inet static
address 10.0.0.40
netmask 255.255.255.0
gateway 10.0.0.1

Example 2 – DHCP
auto eth0 iface eth0 inet dhcp

Remember the DNS configuration in /etc/resolv.conf
nameserver 195.184.96.2
nameserver 213.173.225.86

Tips
Change (spoof) the MAC
ifconfig eth0 hw ether 01:23:45:67:89:AB

From :http://www.handbook.dk/etcnetworkinterfaces-configuration-example-36.htm