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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?

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Which operating system? Do you know that it is specifically torrents? How are they connected (if via cable, you could just look at which corresponding connection LED flashes the most)? Which router model? –  Daniel Andersson May 4 '12 at 11:09
All operating systems are Windows 7. Some of them are downloading torrents most of the time. They are all connected via WiFi. Router is SpeedTouch THOMSON ST780. –  Hello World May 4 '12 at 16:22
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3 Answers

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

Take a look at Cacti as well.

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WallWatcher does not support my router. Cacti requires MySQL, PHP, RRDTool, net-snmp, and a webserver that supports PHP such as Apache or IIS. So both are not good for me. –  Hello World May 4 '12 at 10:49
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If you're using a Mac, you might want to check out PeakHour. It's specifically aimed at monitoring network bandwidth and usage. There is already a discussion over here with more info.

Whilst it doesn't break down which device is doing what (unfortunately most home routers aren't sophisticated enough for this), it does let you monitor multiple devices. This means you could monitor your WiFi base stations or the devices themselves to see which where bandwidth is being used.

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