How do I change the MAC address for an RF850 or RF600?

For the RF6xx and RF850, here is how to change the mac address:

For Wan1
ifconfig eth1 down hw ether 00:08:00:00:00:01 ifconfig eth1 up

For Wan2/dmz
ifconfig eth2 down hw ether 00:08:00:00:00:02 ifconfig eth2 up