VPN Protocols Explained: Which One Should You Use?

What a Protocol Is

A VPN protocol is the set of rules that determines how your device builds and maintains the encrypted tunnel to the VPN server. It controls three things: how secure the connection is, how fast it is, and how reliably it handles network changes. Different protocols make different trade-offs between these factors.

The Main Protocols

WireGuard: fastest, excellent security, use by default. OpenVPN UDP: medium speed, very good security, good for compatibility. OpenVPN TCP: slower, very good security, best for restrictive networks/firewalls. IKEv2: fast, good security, best for mobile/network switching. Lightway (ExpressVPN): fastest, excellent. NordLynx (NordVPN): fastest, excellent. Stealth (ProtonVPN): slower, excellent, built for VPN-blocking networks.

WireGuard — Use This by Default

WireGuard has a codebase of around 4,000 lines — compared to OpenVPN's 70,000+. Smaller code means less surface area for security vulnerabilities and faster independent audits. It uses modern cryptography (ChaCha20, Curve25519) that's both more secure and faster than older algorithms. Connection time typically under 2 seconds. Use this for everything unless you have a specific reason not to.

OpenVPN — The Reliable Workhorse

Slower than WireGuard — typically 10–30% lower throughput — but with enormous real-world testing behind it. Works on almost every network. OpenVPN TCP on port 443 is almost never blocked because port 443 is the standard HTTPS port. Use when WireGuard is blocked or you need maximum compatibility.

IKEv2 — Best for Mobile

Handles network switching better than any other protocol. When you move from WiFi to mobile data, IKEv2 reconnects almost instantly. Battery usage on mobile is lower than OpenVPN. Use on mobile devices. If IKEv2 is blocked on the network you're using, fall back to WireGuard or OpenVPN.

Obfuscated Protocols — For Restrictive Networks

Some networks actively detect and block VPN traffic. Obfuscated protocols disguise VPN traffic as regular HTTPS. ProtonVPN's Stealth protocol bypassed every detection tool we tested. NordVPN's Obfuscated Servers use a similar approach. Use when: you're in a country that actively blocks VPNs, your corporate network blocks VPN connections, or standard protocols aren't connecting.

The Decision Tree

Restrictive network (corporate, censored country)? Use Stealth / Obfuscated Servers / OpenVPN TCP port 443. Mobile device, switching networks frequently? Use IKEv2 or WireGuard. Using ExpressVPN? Use Lightway. Using NordVPN? Use NordLynx. Everything else? Use WireGuard.

One Setting Worth Checking

Whatever protocol you're using: make sure 'auto-connect on startup' is enabled if you want permanent VPN coverage. Make sure the kill switch is on. A fast protocol is useless if the connection drops and your real traffic is exposed before it reconnects. Protocol selection is fine-tuning. Kill switch and DNS leak protection are the fundamentals.

Frequently Asked Questions