http://wiki.mikrotik.com/wiki/Manual:IP/Firewall/Filter

connection-limit (integer,netmaks; Default: ) Restrict connection limit per address or address block

connection limit works only with tcp!!!!!

sadly, I think the new uTorrent v2 encryption system is undetectable (yet). So ... you have to find other ways. Drop everything except good and known ports. Allow only certain number of connections per client. Give client a speed limit. If you do that, you won't even have to worry what they downloa...

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