Trafshow - Real Time Traffic Monitoring for the Paranoid
Of all the thousands of available or recommended applications out there that every geek (and non-geek) should have in their arsenal of tools, there are a few that slip under the radar and go relatively unnoticed in the tech world. One of those is trafshow. I've been using it for years, and it's one of the best network monitoring tools around.
Trafshow is a simple monitoring tool that allows you to set your machine's network card in "promiscuous mode", allowing you to monitor everything that happens on a given network segment.