A friend of mine owns a house with 10 rooms which he's renting out to students. He provides them with Internet access.

Unfortunately, regardless of hes appeals and warnings to the students, they keep downloading illegal files via torrents. He already received 2 warning letters that he's going to be charged.

He now has a extra PC and wants all traffic to the Internet to go through this computer. At the same time he'd like to shape the traffic, and also have the ability to see who the offending students are.

Neither he or I are any good with ubuntu/linux server stuff, but we don't mind reading. Can anyone point us to what tools we would need to install in ubuntu (preferably GUI tools) to assist in this matter?

Any links to websites containing such info could also be handy, since I couldn't find anything myself. (probably cause I'm not using correct search terms)

Thanks,

Andre