If you are using Firewalla Gold in Router Mode, you may go to Network -> NAT Settings -> NAT Passthrough to turn off PPTP, L2TP, IPSEC, etc. Cisco IPsec – 1293 TCP/UDP, 500 TCP/UDP.You can also look into the website of the VPN service provider to find out which ports they are using, then create blocking rules on these ports to prevent VPN connections. This feature will block some of the well-known VPN servers.īelow are some ports used by well-known VPN protocols. Use the Top Graph and watch out for large transfers (upload/download) to destinations that don't make sense.Īfter VPN detection, you can block the domain just by tapping on the network flow. To detect VPN usage may not be that hard, but do require a small knowledge of how networking works. Tor. It is a network of servers that you communicate with anonymously. These also encrypt data but have code to elude detection (such as pretending to be https traffic) The client talks to one server, and a large quantity of data is transferred.
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