Hey guys, I've been messing around with backtrack for about a year now, and I'm taking Linux classes (first year). I'm enjoying it so far. Anyway, I decided I wanted to move onto wireless sniffing, as I've conquered wep and wpa(almost).

So, here's a command I've used, in attempt to just see how to get ettercap running..

ettercap -T -q -p -M ARP // //
And then I get:

ettercap NG-0.7.3 copyright 2001-2004 ALoR & NaGA

Listening on any... (Linux cooked)

ERROR : 19, No such device

 libnet_init(LIBNET_LINK_ADV) failed: libnet_check_iface() ioctl: No such device
And then, the terminal screws up. If you type, the words don't show up, but if you press enter, whatever you type is entered.

Yes, I have searched all over the backtrack site, and yes, I have used my googlefu. There's a few great guides, I have tried different methods, but nothing works.. My friend tried the same commands on his laptop, and he says it works. What's going on?