I have a problem with my roommates using i2hub and various other P2P's on my internet connection. 25 students at our school just recieved RIAA subpeonas for i2hub alone. They use a Cisco VPN program to dial into our university network, and then use that IP to use the P2P programs. I could just block their IP entirely, but I'd prefer if they kept splitting the internet bill with me. My question is, what ports do I block on my router / how do I prevent them from accessing the university network? I've tried a few numbers I've found on google, but the VPN just increments up or down to a different port.