Package tcptrack

Displays information about tcp connections on a network interface

http://www.rhythm.cx/~steve/devel/tcptrack/

tcptrack is a sniffer which displays information about TCP connections
it sees on a network interface. It passively watches for connections on
the network interface, keeps track of their state and displays a list of
connections in a manner similar to the unix 'top' command. It displays
source and destination addresses and ports, connection state, idle time,
and bandwidth usage

General Commands
Command Description
tcptrack Monitor TCP connections on the network