# In case you wish to clone a MAC address on your machine, specify this address in /etc/network/interfaces: 
 auto eth0
 iface eth0 inet dhcp
        hwaddr wh:at:ev:er:ad:dr
If you wish to specify a static ip address, this would become: 
 auto eth0
 iface eth0 inet static
        address 1.2.3.4
        netmask 255.255.255.x
        gateway 2.3.4.5
        #network 1.2.3.256-x
        #broadcast 1.2.3.4