Change MAC address in backtrack

1] Open the terminal type ifconfig.(check your MAC Address)
2] In terminal, type ifconfig eth0 down this command is used for disabling the eth0 interface.
3] Now change the MAC address by using a simple command in backtrack macchanger –r eth04] Now type ifconfig eth0 up this command is used for enabling the eth0 interface
5] Again check your fake MAC Address By typing ifconfig.