How to detect torrent traffic?

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http://serverfault.com – I'm living in a students' hotel and the bandwith for my torrent traffic recently has been limited. How is it possible to detect torrent traffic while it is completely encrypted and the port is also randomized everytime my client starts? The limit only affects my torrent traffic, the rest of the (web, ssh, etc.) are still fine. I have access to the wifi router (since the credentials are the factory default...), but of course it's a part of a greater network, this one only serves ppl on my floor. Can I perhaps take advantage of the router somehow to overcome this limitation? It's a NetGear WGR (HowTos)