Hello

I'm a begginer with Linux. I just grabbed a live distribution of Knoppix and i'd like to know how can I change my MAC adress or if it is possible.

I tried
Code:
ifconfig eth0 hw ether 00:05:11:17:25:34
but it gives me
SIOCSIFHWADDR Op not permitted

When type
Code:
 ifconfig eth0 down
i get the "SIOCSIFFLAGS Permission denied" message.