LinuxJournal has the story describing EtherApe. "EtherApe is a graphical network monitor that lets
you see the action taking place over your network connection. EtherApe displays live connections in a manner that lets you
visualize which connections are busier than others. The nodes appear bigger as larger amounts of traffic go across your network.
It supports various adapter types including PPP, fiber, Ethernet and others. There are three display modes; you can specify IP,
TCP and that other level, Ethernet (link layer). I personally enjoy the Ethernet display because I can see non-IP protocols
displayed as well, providing for a much richer landscape."
June 8, 2001