On 06/26/12 12:47 AM, Rafał Radecki wrote: > tcpdump -n -i eth0.20 > shows that there is no traffic when I try to ping 10.20.0.108. try just tcpdump -n -i eth0 I am not sure you can packet sniff a virtual interface, more likely you can only sniff an actual physical interface. -- john r pierce N 37, W 122 santa cruz ca mid-left coast