root@slax:~# ifconfig rausb0 down

root@slax:~#
root@slax:~# macchanger -r rausb0
Current MAC: 00:15:e9:2b:b4:37 (unknown)
Faked MAC:   0a:23:a7:5b:19:b0 (unknown)
root@slax:~# ifconfig rausb0 up
root@slax:~# ifconfig rausb0
rausb0    Link encap:Ethernet  HWaddr 00:15:E9:2B:B4:37
          inet6 addr: fe80::215:e9ff:fe2b:b437/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3702 (3.6 Kb)  TX bytes:21120 (20.6 Kb)