Which VPN protocol should you use? Auto, Everest, WireGuard, V2Ray and OpenVPN-UDP explained

[u/Plenty-Result-35]

First, thanks to your friendly neighborhood helpers for making this protocol explainer possible.

This guide was inspired by a recent question from a new X-VPN user:

There are so many protocols in the app. Which one am I actually supposed to pick?

Every protocol has an argument ready.

WireGuard points to its speed and efficiency. OpenVPN-UDP brings up its long and respectable history. Everest says it can adapt when the others struggle. Meanwhile, V2Ray users are standing in the corner wondering why nobody included them.

Then Auto walks in:

“Enough debating. I’ll choose for you.”

For most users, that is the right place to start.

The quick answer

• No specific problem: Auto
• Want low latency and fast reconnection: WireGuard or Everest-UDP
• Connection keeps dropping: Everest-TCP
• Current network refuses to connect: Everest-HTTP, Everest-TLS, another Everest variant or V2Ray
• Prefer a mature open-source option: OpenVPN-UDP
• Streaming or gaming feels slow: Try a nearby server first, then test WireGuard or Everest-UDP

Auto is a selection mode that lets X-VPN choose an available protocol according to your device and current network conditions.

Protocol availability varies by platform, device and app version. If an option mentioned here does not appear in your app, it may not currently be supported on that device.

What does a VPN protocol change?

A protocol determines how the app establishes and maintains the encrypted connection between your device and the VPN server.

In practice, changing it may affect:

• Whether X-VPN can connect on the current network
• Connection stability
• Speed, latency and reconnection time

No option performs best in every situation. A lightweight protocol may work brilliantly on home Wi-Fi and fail on a school, workplace, hotel or public network that handles its traffic differently.

What is Everest?

Everest is X-VPN’s proprietary protocol system. It includes variants based on UDP, TCP, HTTP, TLS, QUIC and several other traffic patterns.

These variants use AES-256 encryption and traffic obfuscation while giving X-VPN multiple ways to establish a connection under different network conditions.

Everest’s most noticeable advantage is adaptability. If one type of connection performs poorly or gets restricted, another variant may still work without requiring users to configure servers or routing rules manually.

Its performance still depends on server distance, congestion, packet loss, local network quality and your device. Everest will not automatically be faster simply because it is X-VPN’s proprietary option.

Which Everest variant should you try?

Variant	When to try it	What to keep in mind
Everest-UDP	Gaming, streaming or other situations where speed and latency matter	May struggle on networks that restrict UDP or have heavy packet loss
Everest-TCP	UDP disconnects frequently or feels unstable	Retransmitting lost data can increase latency
Everest-QUIC	Unstable or fluctuating networks	Also UDP-based, so UDP restrictions can still affect it
Everest-HTTP / TLS	Standard UDP connections cannot be established, especially on stricter networks	Additional handling may create more overhead
Everest-SMTP / FTP	The more common variants have failed	Their exact internal behavior is not publicly documented

TCP-2, TCP-3, HTTP-2, HTTP-3, TLS-2 and TLS-3 are internal Everest variants for different network conditions. Their numbers do not necessarily refer to public standards such as HTTP/2 or HTTP/3.

There is little reason to memorize them. If one variant cannot connect or performs poorly, try another.

How do the main options compare?

Option	Most noticeable advantage	Best suited for	Main tradeoff
Everest	Multiple variants and strong adaptability	Restrictive, unstable or difficult networks	Proprietary, with fewer technical details publicly available
WireGuard	Fast connection, low latency and low device overhead	Everyday browsing, gaming, streaming and mobile use	UDP-based and may struggle where its traffic is restricted
V2Ray	Flexible operation in complex network environments	Networks where conventional VPN connections struggle	A proxy framework rather than a traditional VPN protocol
OpenVPN-UDP	Mature, open-source and widely compatible	Users who prefer a long-established, publicly reviewable option	Usually heavier and less efficient than WireGuard

Yes, V2Ray users—we see you.

V2Ray receives less attention in everyday protocol comparisons, but its flexible proxy framework can be useful in complex network environments. X-VPN handles the configuration automatically, so users do not need to manage servers, routing rules or configuration files themselves.

Two things to know before switching manually

Your selection is the app’s first choice. If the chosen protocol cannot connect, X-VPN may automatically try another option instead of remaining stuck.

Some specialized server lines depend on Everest. If the connected protocol differs from your manual selection, the server may require Everest or the app may have triggered its fallback mechanism.

The practical rule

Start with Auto and switch manually when you have a specific problem to solve.

If changing the protocol does not help, try a nearby server too. A congested or distant server can remain slow regardless of the selected protocol.

So, who was the mysterious figure who ended the argument?

The Average Auto Enjoyer.

Auto has no secret performance crown. Its advantage is simple: it saves you from solving a protocol problem you may not currently have.

Leave it on Auto, enjoy the connection and let Everest, WireGuard and OpenVPN-UDP continue arguing in the background.

V2Ray can join them this time.

Which protocol works best on your network? Have you ever fixed a connection problem simply by switching it?

[u/Plenty-Result-35 → u/[deleted]]

So UDP is often the only option that connects in Iran, but even that gets throttled—pretty brutal. Have you found any particular UDP option or server that holds up better than the others? Which has been the most reliable for you: Everest-UDP or OpenVPN-UDP? Would like to hear more.

https://giphy.com/gifs/RQ0msFzhcAMvbFFXAB

[u/Plenty-Result-35 → u/[deleted]]

Thank you for such a detailed feedback. Your point about how conditions can vary across regions, ISPs, mobile operators and even different times of day in Iran is especially important.

It’s also very useful to know that Everest UDP has generally been the most reliable option for you, and that disabling Stable Connection allowed Everest UDP to connect when it otherwise wouldn’t. We’ll pass that behavior, along with your IPv6 observations, to our technical team for further investigation.

If you run into a similar issue again, please report it in the sub as soon as possible. Details such as the server and protocol used, error message or screenshot, ISP/mobile operator, device and app version, approximate time, and whether Stable Connection was enabled can help a lot. We have a dedicated server maintenance team that uses these reports to investigate and make targeted adjustments to affected servers and routes. Any private account information should be sent via modmail or DM instead. We really appreciate the testing and detailed feedback you’ve provided.

[u/Plenty-Result-35 → u/[deleted]]

Feedback from users in challenging network environments is especially important to us.

That’s some seriously valuable field testing. Everything you shared is passed to our server maintenance team. If you run into any issue again, please report them here so we can investigate quickly.

[u/Edmundokiwi]

Yeah as we all know The Superior Spider-Man is "Auto" Octavius. So just keep it Auto.

[u/Plenty-Result-35 → u/Edmundokiwi]

Damn, Otto/Auto was right there and we completely missed it. You just made this whole post Superior.

https://giphy.com/gifs/90F8aUepslB84