What is the main difference between VLESS and VMess?

VLESS is a lightweight, stateless protocol that does not provide encryption itself and must be used with TLS, offering higher performance. VMess is a mature protocol with built-in encryption that can run independently without TLS, but it has more noticeable header fingerprints and higher overhead.

Does Trojan support UDP forwarding?

Trojan has weak UDP support and is typically used only for TCP traffic. For UDP forwarding (e.g., DNS queries or gaming), V2Ray or VLESS is recommended.

Which protocol is best for bypassing deep packet inspection (DPI)?

Trojan and VLESS (with TLS) perform exceptionally well against DPI because their traffic characteristics are nearly identical to normal HTTPS. VMess's protocol headers may be recognized by some DPI devices.

In-Depth Analysis of Four Proxy Protocols: Technical Features and Scenario Selection for V2Ray, Trojan, VLESS, and VMess

2/20/2026 · 3 min

Introduction

As network censorship techniques evolve, proxy protocols continue to iterate. V2Ray, Trojan, VLESS, and VMess are four of the most notable protocols, each with unique technical architectures and use cases. This article compares them across encryption methods, transmission performance, anti-detection capabilities, and deployment complexity.

V2Ray: The Foundation of a Modular Framework

V2Ray is not a single protocol but a modular proxy platform supporting VMess, Shadowsocks, Socks, and more. Its key advantages include:

Flexible transport configurations: Supports TCP, mKCP, WebSocket, HTTP/2, QUIC, and more, allowing traffic to be disguised as common protocols.
Powerful routing: Built-in routing rules enable intelligent traffic splitting based on domain, IP, or geographic location.
Multi-protocol support: The server can listen on multiple protocols simultaneously, easing migration and compatibility.

However, V2Ray's configuration complexity is high, and TLS encryption requires additional setup, making it less beginner-friendly.

Trojan: Simple and Efficient HTTPS Masquerading

Trojan's design philosophy is "simplicity equals security." It runs directly over TLS, disguising traffic as standard HTTPS:

Minimalist architecture: Relies solely on TLS encryption without additional obfuscation, resulting in very low performance overhead.
High anti-detection: Traffic characteristics are indistinguishable from normal HTTPS, making passive detection difficult.
Easy deployment: Can be quickly set up with Nginx or Caddy, and supports a fallback mechanism to further reduce fingerprints.

Trojan's limitations include lack of multiplexing (mux) and weak UDP support, making it suitable for latency-sensitive scenarios.

VLESS: Lightweight Stateless Protocol

VLESS is a lightweight protocol introduced by the V2Ray community to replace VMess:

Stateless design: The server does not maintain client session state, reducing memory usage and improving concurrency.
Zero encryption overhead: Does not provide encryption itself and must be used with TLS, avoiding performance loss from double encryption.
XTLS enhancement: Uses XTLS technology for "directed proxying," encrypting only non-TLS traffic, significantly boosting forwarding efficiency.

VLESS's weakness is its mandatory reliance on TLS, and XTLS compatibility is still being refined.

VMess: Mature and Stable Encryption Protocol

VMess is V2Ray's native protocol, offering complete encryption and authentication:

Built-in encryption: Supports AES-128-GCM, ChaCha20-Poly1305, etc., without requiring external TLS.
Anti-replay attack: Uses timestamps and random numbers to prevent packet replay.
Metadata obfuscation: Request headers are encrypted and padded with random data, increasing traffic analysis difficulty.

VMess's drawbacks include more noticeable protocol header fingerprints and higher encryption overhead compared to VLESS and Trojan.

Scenario Selection Recommendations

For maximum stealth: Choose Trojan, and consider using a CDN to further hide the server IP.
For flexible routing and multiple transports: Opt for V2Ray (with VMess or VLESS), suitable for complex network environments.
For high performance and low latency: VLESS + XTLS is the best choice, especially for video streaming and gaming proxies.
For compatibility priority: VMess, as a mature protocol, offers better support on older clients or special networks.

Conclusion

No protocol is perfect; only the right fit for the scenario. Trojan wins with simplicity, VLESS pursues extreme performance, VMess provides stable encryption, and V2Ray is an all-in-one platform. Evaluate based on actual needs—network environment, client devices, and operational capabilities—and consider hybrid deployments when necessary.