IT professionals call this Deep Packet Inspection (DPI) which can analyze the type and destination of every data packet traversing the network.ĭeep packet inspection is what allows your ISP to tell the difference between youtube, web browser, VPN, skype or any of 1000+ other types of traffic. Some VPN protocols even use default data packet headers that allow firewalls fingerprint VPN packets.įirewalls use advanced software to perform this analysis. Deep packet inspection (DPI)Įven though VPN data packets are fully encrypted, they still contain metadata the tells intermediaries (like your ISP) where to forward them to. If a firewall blocks these ports entirely, any VPN running on exclusively on those ports will be blocked as well.įortunately, full port blocking isn’t used very often, especially for port 443 which is also used by all SSL traffic (the encryption that protects all secure websites).īypass port blocking: Switch to a different tunneling protocol or non-standard port. VPN protocols like OpenVPN often run on the same default ports: 443 for TCP and 1194 for UDP traffic. These are the tools you’ll see most often: Port Blocking Network admins use multiple techniques to block VPNs and other encrypted traffic. Fortunately, there are several techniques you can use to disguise VPN traffic, making it almost unblockable.
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