CentOS blocking P2P on OpenVPN
I've got several CentOS-5 LEB's on which I'm running OpenVPN. I have a bunch of users from many countries in the world who use these connections to ensure that their traffic won't be monitored by the government. Unfortunately, one of my users decided to torrent a copy of 'NCIS' on a US server and it resulted in a DMCA take down.
I sent out the nasty-gram notice to my users about doing illegal things like that. But what other steps could I take to prevent this from happening again? Is there a simple way of blocking bittorrent? If I pushed OpenDNS back to the user for their DNS, would that stop this? Open source or commercial solutions are welcome.
Sarcasm: Just one more service I offer