tcpdump

=====tutorial===== http://openmaniak.com/tcpdump.php

=====list all traffic===== sudo tcpdump

=====list all interfaces===== sudo tcpdump -D

=====log traffic on interface eth0===== sudo tcpdump -i eth0

=====list traffic on certain port===== sudo tcpdump port 443

=====show ip-addresses instead of DNS names===== sudo tcpdump -n

=====traffic from src ip on port===== sudo tcpdump port 443 and src 217.149.135.12