etherape -- Graphical network viewer modeled after etherman.
http://etherape.sourceforge.net/
Etherape is a graphical network monitor for Unix modeled after
etherman. Featuring ether, ip and tcp modes, it displays network activity
graphically. Hosts and links change in size with traffic. Color coded
protocols display. It supports ethernet, ppp and slip devices. It can
filter traffic to be shown, and can read traffic from a file as well as
live from the network.