Tech Blog - Snoop is an network sniffer tool for Unix, snoop captures all packets on you network in either real time or raw format that can later be loaded to analysis tools such as Wireshark, Snoop gives very detail of information.
Note: Snoop must be run as root.
Note: Try to snoop to output of file as opposed to STDOUT for performance reasons.
$ snoop -o filename.out
To capture on verbose mode
$ snoop -V -o yourfilename -c 1000