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What Are SNI and ECH? Why They Matter – opas

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示意图：TLS 握手中的 SNI 与 ECH 扩展
示意图：TLS 握手中的 SNI 与 ECH 扩展

SNI 是什么

SNI 告诉服务器你要访问哪个域名；审查设备可据此识别目标站。

ECH 是什么

  1. ECH 加密 ClientHello 中的 SNI
  2. 可减少明文 SNI 被识别
  3. 部署仍取决于客户端与网站支持
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和翻墙的关系

Reality 等协议用不同思路伪装握手；SNI/ECH 知识有助于理解 DNS/握手故障。

UKK

开了 ECH 就能免封吗？
不能单独保证；整体协议与出口仍关键。

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Liittyvät oppaat

Mikä on VLESS Reality? Hiljainen välitysprotokolla selitettynä (2025) proxy или tun: DNS Leak and Routing Accuracy – opas TUN Mode vs System Proxy: Which to Use (When the Browser Works but an App Won't) – opas iOS: Set Up Univista with sing-box–Compatible Clients – opas Latency, Jitter, Packet Loss: Practical Guide – opas Node Health Metrics and Troubleshooting Path – opas

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This article is for technical education only. Comply with local laws when using network tools. Univista is not liable for how you use the service.