Now P2P is too good, so use QOS can't stop. So
1、 setup limit connection:in Firewall, Filter Rule add
Action: drop Protocol: TCP UDP Extra-Connection Limit: xx
2、set connection timeout: in Firewall, Connections, Tracking-TCP Established Timeout: 00:05:00 (5mins by your want)
then......p2p......can use, but.....you know