Monitor traffic through a home router

Question

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?

Solution 1

I recommend reading these articles from HTG:

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

Solution 2

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

Take a look at Cacti as well.

Comments

[Daniel Andersson]

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?

[tanius]

Good answer that works independently of the router model, but unfortunately only for Ethernet traffic (not wifi traffic going directly to the router): raspberrypi.stackexchange.com/a/45042

[Hello World]

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.

[boot13]

Wallwatcher also has generic IPTables and Syslog settings. If your router runs on Linux, you should be able to make it work.

[Nobody]

What do they say about link-only answers?

[tanius]

wallwatcher.com says: Wallwatcher is no longer available. (since 2011)