linux - changing the mac address of a physical interface

command line

to change the mac of eth1, do...

ip link set dev eth1 address 00:30:18:ad:6f:f5

this does NOT survive reboot

for gentoo, a line similar to the one below will be needed. replace eth1 with the name of you interface.

# cat /etc/conf.d/net | grep mac
mac_eth1="00:30:15:ad:9f:f8"