Monitor traffic through a home router

We have an Internet connection which is shared on five computers via a home router.

One of the computers is using torrents all the time. I want to find out which, and they won't tell me.

How can I check which client is using the most traffic?


I recommend reading these articles from HTG:

  • HTG: Capturing packets with wireshark
  • HTG: Monitoring bandwidth usage

WallWatcher collects, displays, and analyzes log information from more than 135 Routers and firewalls.

Take a look at Cacti as well.