How to use tcpdump to listen to a session?

Listen for all traffic for host x:

tcpdump -n host 10.10.10.20 -i eth0

Listen for all traffic for connection on port x:

tcpdump -n dst port 8080 -i eth0

Option “-vvv” for more info…
Option “-i any” to listen on all interfaces

A nice article about the options: rationallyparanoid.com/articles/tcpdump.html