I wanted to analyze the traffic on my Linksys WRT54GS and started to search for an application that can do just that. I stumbled upon WallWatcher (http://www.wallwatcher.com).

Because my Linksys router is flashed with the Sveasoft firmware, it has syslogd. You only have to enable logging on the linksys, enable syslogd and send log traffic to the IP address of the computer where you run WallWatcher.

From that moment on it is all very easy. Below you can see a graph that WallWatcher generates based on the captured log traffic.

Damn BitTorrent traffic. :-)