MikroTik

Simple question... i have a hotspot for a public wisp infraestructure... bandwith is not a trouble (limited to 300 kbs per user), same with connection time... after 90 mins... the connection down....but i want to filter users with p2p programs active (like torrent,...) why? because each user try to create hundreds o connections... and if this is bad in a wired network... in a wireless network .....

So what i want is to limit the number of connections per user to 100 ... is it possible??? how???

Thanks.