TCPDUMP MANUAL

Basic communication // see the basics without many options
# tcpdump -nS
Basic communication (very verbose) // see a good amount of traffic, with verbosity and no name help
# tcpdump -nnvvS
A deeper look at the traffic // adds -X for payload but doesn’t grab any more of the packet
# tcpdump -nnvvXS
Heavy packet viewing // the final “s” [...]