VPN Protocols Explained — Which One Should You Actually Use
When you pick a VPN, you are also picking a VPN protocol — or letting the VPN app pick for you automatically. Most people never think about it. But the protocol matters: it determines your speed, your security, and sometimes whether the VPN actually works on your network. Here is what you need to know, in plain terms.
What Is a VPN Protocol?
A VPN protocol is the set of rules that determines how your device encrypts your data and communicates with the VPN server. Think of it like the language two people use to talk to each other — if they both speak the same language fluently, the conversation is fast and accurate. If they are translating through a middleman, it is slower and more can go wrong.
Every VPN uses a protocol. Some are old and outdated. Some are modern and fast. Some are so secure that governments use them. Some are fine for watching Netflix but not for anything sensitive.
WireGuard — The New Standard
WireGuard is the newest mainstream VPN protocol, released in 2020. It was designed from scratch to be simpler, faster, and more secure than existing protocols. Most VPN services have adopted it or are in the process of adopting it.
Speed: WireGuard is significantly faster than OpenVPN — typically 2-4x faster in real-world tests. It achieves this partly through modern cryptographic tools and partly through being extremely lean (about 4,000 lines of code vs OpenVPN's 500,000+).
Security: Excellent. WireGuard uses modern, well-vetted cryptographic primitives. It is considered more secure than OpenVPN in design, though OpenVPN has a longer track record of real-world security auditing.
Compatibility: Works on all major platforms (Windows, macOS, Linux, iOS, Android). Some corporate firewalls block WireGuard because it is relatively new and uses a specific port — though this is becoming less common.
Privacy: One notable downside: WireGuard assigns static IP addresses rather than rotating them like OpenVPN does. Some VPN providers address this by running WireGuard with their own IP rotation systems on top. NordVPN's "NordLynx" is WireGuard with this protection added.
Verdict: Best overall choice for most users. Fast, modern, and secure. Use NordVPN's NordLynx or any provider's WireGuard implementation.
OpenVPN — The Reliable Standard
OpenVPN has been the industry standard for over 20 years. It is open-source (meaning anyone can audit the code), highly configurable, and rock-solid reliable. It runs on essentially any network without issues.
Speed: Slower than WireGuard — typically 30-50% slower in throughput. But for most real-world uses (browsing, streaming, video calls), the difference is imperceptible.
Security: Excellent. OpenVPN has been security audited extensively over two decades. It uses AES-256 encryption by default, which is what governments and militaries use.
Compatibility: Excellent. OpenVPN works on any network because it can run on any port — it can even be disguised as HTTPS traffic (port 443) to get through strict firewalls and corporate networks that block VPN connections.
Privacy: Strong. Because OpenVPN uses dynamic IP assignment by default, it is harder to track individual users over time.
Verdict: The best choice if you need to bypass aggressive network restrictions or if you prioritize maximum compatibility over raw speed. Use ExpressVPN's implementation or any quality provider's OpenVPN option.
IKEv2/IPSec — The Mobile Choice
IKEv2 (Internet Key Exchange version 2) is a VPN protocol that is particularly good at maintaining connections when you switch networks — WiFi to cellular, for example. It is widely used, particularly on mobile devices.
Speed: Very fast, comparable to WireGuard in most tests. IKEv2 handles network changes particularly well — your call does not drop when you leave WiFi and switch to cellular.
Security: Good. Uses AES-256 like OpenVPN. It has been around a long time and has been thoroughly analyzed. Some concerns have been raised about NSA involvement in the standardization of IKEv2, but no concrete weaknesses have been publicly proven.
Compatibility: Built into iOS, macOS, and Windows natively. Good on Android with third-party apps. Linux support varies by distribution.
Verdict: Excellent for mobile users who switch networks frequently. If you use your phone on both WiFi and cellular throughout the day, IKEv2 will give you the smoothest experience.
L2TP/IPSec — The Middle Ground (Mostly Obsolete)
L2TP (Layer 2 Tunneling Protocol) is an older VPN protocol that does not provide encryption on its own — it is always paired with IPSec for that. It is still found in some enterprise environments and built into most operating systems.
Speed: Moderate. Faster than PPTP but slower than OpenVPN or WireGuard. The double encapsulation (L2TP + IPSec) adds overhead.
Security: Adequate but not ideal. The IPSec layer provides encryption, but L2TP has some known weaknesses and the combination has had past vulnerabilities. Generally fine for non-sensitive use, not recommended if you need strong security.
Compatibility: Good — built into most operating systems.
Verdict: Rarely the best choice anymore. If a VPN only offers L2TP/IPSec, look elsewhere.
PPTP — Skip It
PPTP (Point-to-Point Tunneling Protocol) is ancient — introduced with Windows 95. It should not be used in 2026. It has known serious security vulnerabilities that have been documented since the early 2000s. Some free VPN services still use it, which is a red flag.
Speed: Fast — but this is irrelevant when the encryption is broken.
Security: Critically weak. The MS-CHAPv2 authentication used by PPTP was broken in 2012 and can be decrypted in minutes. Do not use PPTP for anything.
Verdict: Avoid completely. Any VPN still offering PPTP as an option should not be trusted.
Which Protocol Should You Use?
In 2026:
- Use WireGuard (or NordVPN's NordLynx) for the best balance of speed and security on any device
- Use OpenVPN if you are on a restricted network (corporate hotel WiFi, some countries) that blocks WireGuard
- Use IKEv2 if you are primarily on mobile and need seamless WiFi-to-cellular switching
- Never use PPTP or L2TP/IPSec unless there is no other option
Most quality VPN apps default to WireGuard now, which is the right call for most users. If you need to manually configure a VPN, WireGuard is the best choice for almost everyone.
See our full reviews: NordVPN Review · ExpressVPN Review