After KuaiLian VPN Was Blocked: The Underlying Logic of Circumvention Tools and Survival Guide

Part One: Cyberpunk Relics

Freegate and Ultrasurf were the first players in this game. Over a decade ago, when the firewall still operated on relatively crude rule-matching, these tools relied on constantly rotating IP addresses, helping countless people see the world beyond the wall for the first time. Their historical contribution is undeniable.

But today's firewall has evolved into something else entirely. It's no longer just a static blacklist but更像是一套拥有主动识别能力的流量分析系统 capable of comprehensive analysis of packet behavior patterns, encryption characteristics, and timing patterns.

Part Two: Commercial Capital's Misconception

Traditional commercial VPNs were designed for enterprise-level privacy protection — their core problem to solve was "preventing data from being stolen by middlemen," not "preventing traffic from being identified as anomalous." These are two completely different goals.

The result: these tools appear extremely conspicuous online — like a heavy armored vehicle painted in camouflage with police lights. The firewall's interception logic doesn't need to crack its content — it just spots the vehicle on the highway and detains both vehicle and occupants.

Part Three: Evolution of the Cat-and-Mouse Game

Era of Chaotic Encryption (Shadowsocks)

The core approach of the first generation modern circumvention protocol: encrypt all data into machine-illegible gibberish. This logic worked in the early days. The problem: normal internet users don't produce purely randomly distributed gibberish traffic — it's statistically too anomalous.

Era of False Facades (V2Ray)

Second-generation protocol approach: disguise. Since gibberish gets identified, wrap the encrypted data inside a shell of a normal website — buy a domain, disguise circumvention traffic as ordinary HTTPS webpage visits.

Era of Reverse Merger (Reality Protocol, 2023)

Reality protocol fundamentally solved the "fake website" problem with extreme cleverness —，干脆不建自己的网站了。Its core principle: directly "borrow" the TLS certificate characteristics of real large websites. When the firewall tries to probe the connection, it sees 完全真实的苹果或微软服务器的响应。

Era of Extreme Speed and Stealth (Hysteria2, 2024–Present)

Hysteria2's approach: change lanes. Based on UDP protocol, which is primarily used for video streaming, gaming data, and real-time audio/video transmission. Hysteria2 packages circumvention traffic as highly smooth 4K video packets, making characteristics much harder to identify while leveraging UDP's lack of congestion control for higher transmission speed.

Part Four: Two Realistic Viable Paths

Self-Built Nodes: True Initiative

If you have the curiosity, renting a VPS abroad and deploying Reality or Hysteria2 protocol is currently the most stable solution recognized by the tech community. Geph (迷雾通) is another trustworthy option for those who don't want to deal with configuration.

Paid Exit Nodes: Speed vs. Cost Exchange

IPLC/IEPL dedicated lines (commonly called "airports") connect directly to overseas through privately laid international circuits between carriers, physically bypassing the firewall's review nodes — resulting in high speed, low latency, and greater stability. The problem: monitoring rights over this channel are held by the airport operator. Your traffic is technically transparent to the service provider.

This cat-and-mouse game will never end. Understanding this underlying logic at least saves you from being a blind person feeling an elephant.