Ettercap - Send L3 error

[v€rgna]

Hello everyone, after having followed the excellent guide "-1-14 ettercap sniff username and password on LAN" by birgante I encountered the following problem (Backtrack v.4 pre final):

When active MITM - Arp Poisoning and then start sniffing
I get the following error:

SEND L3 ERROR: 1500-byte packet (0800:06) Destined to xx.xx.xx.xx. was not forwarded (libnet_write_raw_ipv4 (): -1 bytes written (Network is unreachable)

Can anyone help me?
Thanks

[Archangel-Amael]

First of all welcome to the forums, second re-read the rules you agreed to when you signed up.
Third your inability to get something to work does not constitute a bug nor a fix. So make sure you post in the correct section next time.
Not the bug and fixes section.
4th what answer where you given in your other thread on the same subject?