Changing MAC Address on a NIC Card

                                  
Example: 

'ifconfig -a' shows:

- - - - - - - - -

hme0: flags=1000843 mtu 1500 index 2
        inet 192.168.1.120 netmask ffffff00 broadcast 192.168.1.255
        ether 8:0:20:cf:ea:9f
qfe0: flags=1000803 mtu 1500 index 10
        inet 192.168.1.150 netmask ffffff00 broadcast 192.168.1.255
        ether 8:0:20:cf:ea:9f

- - - - - - - - -

notice the ether (MAC) address is the same for each interface...

to force the MAC address, run

ifconfig qfe0 ether 8:0:20:cf:ea:9a 

and now 'ifconfig -a' shows:

- - - - - - - - -

hme0: flags=1000843 mtu 1500 index 2
        inet 192.168.1.120 netmask ffffff00 broadcast 192.168.1.255
        ether 8:0:20:cf:ea:9f
qfe0: flags=1000803 mtu 1500 index 10
        inet 192.168.1.150 netmask ffffff00 broadcast 192.168.1.255
        ether 8:0:20:cf:ea:9a

- - - - - - - - -

these changes will not persist after a reboot.  To set each interface to a different MAC
address permanently, run:

eeprom local-mac-address\?=true

and upon reboot, the MAC addresses will be unique for each interface.