here. /etc/hosts - some hostname --> IP mappings are defined here, (notably 127.0.0.1 MACHINE_NAME.DOMAIN localhost ) [11] MAC spoofing Sometimes, it's useful to spoof the MAC address of an interface, in order to pretend to be another machine. Temporary change: ifconfig eth0 hw ether 00:01:02:03:04:08 (where 00:01:02:03:04:08 is the mac address