A few things you could try:
- toggle the promiscuous setting in iptraf
- check if the IP traffic arrives at your pc
the following command should list some IP packets:
Code:
tcpdump -c 1000 -i eth1
It captures the first 1000 packets that arrive at eth1
Edit: You do realise that those numbers that you see in your screenshot are mac addresses? I see one from a Cisco NIC, some from a D-Link NIC, and some of manufacturers I've never heard off