I would also very much like to use SNORT to block P2P traffic. SNORT does an excellent job of detecting P2P no mater what port is being used. I have SNORT running on the WAN interface set to block any one who generates a snort aleart. However with P2P traffic it is always my own public IP that is detected as "generating" the alert. Since my own IP is in the whitelist all that is acomplished is that I am alearted to the use of the programs. I would run SNORT on the LAN side but I have about 25 other smaller firewalls behind PFsense with each of them connecting 5-20 individual clients. So if I blocked any one ip on my LAN interface I will cut off internet to several people. If it were possible to run SNORT on the WAN interface and set it to block BOTH ip addressees associated with a SNORT alert. I believe that this would solve my problem and effectively stop the P2P. (And help keep my little wisp from getting sued by the RIAA) ;)
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