同样一台海外机，有的 IP 秒挂、有的一直稳——差别在封锁手段和对抗方式。本文做原理科普。
常见的封锁手段（科普）
- IP 封锁：直接屏蔽某个 IP 或整个 IP 段（详见 IP 为什么被墙）。
- DNS 污染：让域名解析到错误 / 无效地址。
- 协议 / 特征识别：通过流量特征、SNI 等识别出代理流量。
- 主动探测：对可疑服务器主动发包试探，确认后封锁。
为什么有的更”抗封”
把流量伪装成正常 HTTPS（如 Trojan / Reality）、随机化特征、避免被主动探测识别——伪装越像正常访问越难被封。
为什么便宜机 / 知名商家 IP 段易挂
这类 IP 被大量用于代理，容易被整段拉黑（这也是 便宜机的坑 之一）。冷门、干净的 IP 段相对耐用。
应对（概念）
本文为原理科普，不含搭建教程，请在合法合规前提下使用海外服务器。挑机型去 库存监控。
Two overseas machines side by side — one gets blocked instantly, the other stays stable for years. The difference lies in blocking methods and countermeasures. This article covers the fundamentals.
Common Blocking Techniques
- IP blocking: Directly banning a specific IP or an entire IP range (see Why IPs Get Blocked).
- DNS poisoning: Redirecting domain lookups to incorrect or invalid addresses.
- Protocol / fingerprint detection: Identifying proxy traffic by traffic patterns, SNI, and other characteristics.
- Active probing: Sending test packets to suspicious servers to confirm proxy usage before blocking.
Why Some Connections Are More “Block-Resistant”
Disguising traffic as normal HTTPS (e.g., Trojan / Reality), randomizing fingerprints, and avoiding detection by active probing — the more traffic looks like legitimate browsing, the harder it is to block.
Why Cheap VPS / Well-Known Provider IP Ranges Get Blocked More Easily
These IPs are used by large numbers of users for proxying, making entire IP ranges easy targets for bulk blacklisting — this is one of the pitfalls of cheap VPS. Lesser-known, clean IP ranges tend to last longer.
Countermeasures (Conceptual)
Switch to a clean IP, use a CDN relay to hide the origin server, or choose a probe-resistant protocol.
This article is an educational overview and does not include setup tutorials. Please use overseas servers in compliance with applicable laws and regulations. To find a VPS, visit the stock monitor.
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