I have a rooted Xoom wifi, and I have configured it to run Backtrack5 in the terminal through ConnectBot and in the X through vnc.

I have been been trying to use ettercap for testing purposes, but I get an error every time. Here is exactly what happens:

ettercap -C
Sniff > Unified Sniffing
Hosts > Scan for Hosts

and then I always get the error:
FATAL ERROR: Interface not suitable for layer2 sending

ip_forwarding was disabled, but we cannot re-enable it now.
remember to re-enable it manually.

Does anyone have any thoughts on this? I know that people have gotten it to work before, but I'm not sur what tweaks might need to be made.