To se MAC address on WRT54Gsv5

nvram set et0macaddr=00:16:b6:c1:8f:78
nvram commit
nvram set il0macaddr=00:16:b6:c1:8f:79
nvram commit


To se MAC address on WRT54Gv5

nvram set et0macaddr=00:14:bf:ce:66:40
nvram commit
nvram set il0macaddr=00:14:bf:ce:66:41
nvram commit





WAP version 3

nvram set et0macaddr=00:1A:70:AA:17:98
nvram set il0macaddr=00:1A:70:AA:17:97
nvram set WAPver=3
nvram commit