What Is WireGuard? Complete Guide to the Best VPN Protocol

October 27, 2026 By Nancy William No Comments 6 minutes

You’ve probably gone through VPN settings and come across “WireGuard” in the list of protocols. You may have selected it, thinking it was a default protocol. Alternatively, maybe you never used it and didn’t know much about it.

WireGuard has become the go-to protocol for most VPN providers, and there’s reason for it. It’s faster than older options, simpler to audit, and built on modern cryptography. However, despite this, it’s not ideal for every situation; everything has its pros and cons. 

This guide covers what WireGuard is, how it works, where it’s best to use, and where it falls short. Towards the end of this guide, you’ll have a better idea of how WireGuard works, when to use it, and when to choose something else.

What Is WireGuard?

WireGuard is a modern VPN protocol. It creates encrypted tunnels between devices, protecting your traffic from spying or monitoring. It helps mask your IP address.

Unlike older protocols like OpenVPN, which carry years and years of accumulated code, WireGuard was designed from scratch. 

It uses roughly 4,000 lines of code compared to OpenVPN’s 70,000+. That smaller footprint makes it easier to audit, faster to run, and less likely to contain hidden issues.

The protocol was created by Jason Donenfeld and merged into the Linux kernel in 2020. Since then, it has become the default choice for most major VPN providers, including FastestVPN. 

How Does WireGuard Work?

WireGuard operates on a few core principles that set it apart from legacy protocols. Here’s how: 

Key-Based Authentication

WireGuard uses public and private key pairs to authenticate devices. Each peer has its own key pair, and you exchange public keys to connect. It works similarly to how SSH key authentication works; simple, direct, and secure.

Modern Cryptography

WireGuard relies on a fixed suite of modern cryptographic primitives. These include:

• Curve25519 for key exchange
• ChaCha20 for encryption
• Poly1305 for authentication
• BLAKE2s for hashing

WireGuard doesn’t let you pick and choose encryption methods. You get one fixed set of ciphers, and that’s it. This removes the risk of someone misconfiguring the protocol, and it shuts down downgrade attacks completely.

UDP-Only Transport

WireGuard communicates exclusively over UDP. This design choice contributes to its speed but creates limitations in restrictive network environments where UDP traffic might be blocked.

Minimal State

WireGuard keeps very little session state in memory. It quickly removes inactive peers, reducing the exposure window if a device is compromised.

WireGuard vs OpenVPN vs IKEv2 (Comparisons)

Every VPN protocol works differently. You choose one that works well with your task at hand. Here’s how the three most common options stack up: 

Why is WireGuard Considered the Best?

WireGuard is considered the best protocol to date because it excels where speed matters most. Independent testing shows it delivers the highest throughput and lowest latency among VPN protocols.

 It’s ideal for streaming, gaming, and general browsing on mobile devices where battery efficiency matters.

Its ability to maintain connections when switching between Wi-Fi and cellular networks makes it particularly strong for mobile users.

When Should You Choose OpenVPN Protocol?

OpenVPN supports both UDP and TCP. The TCP option can disguise VPN traffic as regular HTTPS traffic on port 443. This makes it valuable for bypassing firewalls in restrictive countries. By contrast, WireGuard cannot do this.

If you’re in a country with strict internet controls, or on a network that blocks UDP, OpenVPN is the more reliable choice.

When Should You Use IKEv2?

IKEv2 is built into most modern operating systems. You don’t need a third-party app to use it on iOS, macOS, or Windows. For users who prefer native integration over installing extra software, IKEv2 offers a convenient middle ground. However, we’d still prefer WireGuard and OpenVPN over it. 

What is WireGuard Protocol Good For?

Here are the top 5 areas where WireGuard outshines the rest:

1. Streaming and Gaming

WireGuard’s low latency and high bandwidth make it the best protocol for streaming videos and online gaming. You’ll experience less buffering and smoother gameplay compared to older protocols.

2. Mobile VPN Connections

WireGuard handles network transitions gracefully. When you leave your home Wi-Fi and switch to cellular data, WireGuard maintains the connection without dropping or renegotiating. This is a significant advantage for users who move around during the day.

3. Self-Hosted VPNs

WireGuard’s simplicity makes it a favorite for self-hosted setups. You can configure a WireGuard server on a VPS or even a Raspberry Pi with minimal effort. The configuration files are short and easy to understand.

4. Site-to-Site Connections

Businesses use WireGuard to connect branch offices or link remote workers to internal networks. Its efficiency reduces overhead and keeps connections stable.

5. IoT and Critical Infrastructure

WireGuard can shield IoT devices. These include security cameras, sensors, and smart home components, all protected from direct internet exposure. You route access through the VPN tunnel, making the devices invisible to attackers.

WireGuard Pros and Cons

Just to get a clearer idea of this VPN protocol, here are a few pros and cons: 

Pros of WireGuard 

Cons of WireGuard 

How to Set Up WireGuard with FastestVPN

FastestVPN offers a WireGuard protocol for all its apps. Here’s how to get started using Windows as an example: 

• Download the VPN for Windows from the official site. 
• Once installed, launch the VPN.
• Sign in to your account. 
• Head to the settings menu, protocols, and then enable WireGuard on Windows.  
• After that, you can connect to whichever server location you like. 

Frequently Asked User Queries

To Conclude

You now know practically everything there is to know about WireGuard. It’s earned its spot as one of the top default VPN protocols for most users. It’s faster than older options, simpler to configure, and built on solid modern cryptography. FastestVPN offers it for all its apps, and you can simply enable it in the VPN settings.