change MAC address permenantly (Debian, Ubuntu)

Remove network-manager (apt-get remove network-manager)

add the following line in /etc/network/interface

auto eth0
iface eth0 inet dhcp
hwaddress ether 00:00:00:00:00:00
# 00:00:00:00:00:00 is the fake MAC address

reboot....



Not permenant methods

ifconfig eth0 down
ifconfig eth0 hw ether 00:00:00:00:00:00
ifconfig eth0 up
ifdown and ifup eth0 or /etc/init.d/networking restart

or

macchanger --mac=00:00:00:00:00:00 eth0

(apt-get install macchanger)