WireGuard appeared as an answer to the main complaint about OpenVPN and IPsec: there is simply too much of them. Hundreds of thousands of lines of code, years of auditing, complex setup. WireGuard fits into roughly four thousand lines — and that determines almost everything else.
The short answer
WireGuard is a compact VPN protocol over UDP with a fixed set of cryptography. It establishes a connection quickly, puts little load on the processor and is easy to review. It cannot disguise traffic, and it never set out to.
Fixed cryptography
Older protocols negotiate algorithms when connecting: the parties list what they support and pick a common one. This is flexible, but historically it was at exactly this stage that vulnerabilities arose — for example, when a weaker option could be forced.
WireGuard took a different path: the set of algorithms is baked into the protocol, there is nothing to negotiate. If an algorithm becomes outdated, a new version of the protocol is released rather than the old one being kept for the sake of compatibility. Less flexibility, and less attack surface too.
Cryptographic routing
The central idea. Each participant has a key pair, and every public key is tied to a list of allowed addresses. When a packet arrives, the server looks at which key signed it and checks whether the sender's address is allowed for that key. Not allowed — the packet is dropped.
Authentication and routing turn out to be a single operation rather than two. Hence both the speed and the simplicity: there is no separate access-rule subsystem.
Why the connection is established quickly
The handshake takes one message exchange in each direction. OpenVPN spends several exchanges on the TLS handshake. On a good channel the difference is imperceptible; on mobile internet with latency, it is quite noticeable.
Silence
WireGuard does not respond to packets from unknown senders. Port scanning yields nothing: the server simply stays silent, and from the outside it is unclear whether anything is there at all. This protects against mass probing, but it does not help against analysis of an already-established connection.
Where the weak spot is
- Traffic is recognizable. WireGuard packets have a characteristic structure. Where connections are filtered by type, this becomes decisive.
- UDP only. On networks where UDP is restricted or cut off, the protocol will not come up at all.
- Addresses in the server's memory. By default the server keeps the "key — last address" mapping and does not clear it immediately. For service operators this is handled by configuration, but by default the behavior is exactly this.
When WireGuard is the right choice
A home or office network without filtering, where the goal is speed and stability. A connection between your own servers. Connecting to a work network where you control both sides. In all these cases simplicity and performance work in your favor.
Why it is not in VolnaLink
On the networks the service is designed for, how recognizable the traffic is matters more than a few percent of speed. That is why we use VLESS Reality, Trojan and Hysteria 2 — protocols whose job includes disguise. The app chooses between them on its own.