@gertjan said in How to detect P2P traffic and block it using pfSense:
I still doubt that a app on some pc somewhere on some LAN will 'cooperate' by having it's activity detect by some upstream device running snort and the OpenAppID detector.
I should really try it out, as I have, in theory, a device (4100 MAX) that would be able to do so.
It is a cat and mouse game between the p2p software developers and the IDS/IPS Layer 7 detection software developers. The goal of p2p is to "elude" detection, and the goal of stuff like OpenAppID is to "detect" p2p. Currently there are some things that do still happen in the clear during initial session setup, and that allows detection. Of course tomorrow some p2p variant will make a change to foil that detection, and then the OpenAppID folks will respond. So, back and forth the game continues.