[kubuntu] Any Software to detect torrent in network

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http://ubuntuforums.org – Hi there guys is there any program that detects if other person in a network has applied torrent?? My brother apply torrent and suck up all the bandwidth. When I ask him he totally deny that he applied the torrent. I am sure he apply torrent. So guys is there any simple program that i can use to bust his ***? (Hardware)