---
id: "edns"
kind: "glossary-term"
title: "EDNS"
language: "zh-Hans"
category: "DNS与技术基础"
updated: "2026-10-10T12:00:00Z"
canonical: "https://tldlog.com/zh/cihui/edns/"
translations:
  en: "https://tldlog.com/glossary/edns/"
  es: "https://tldlog.com/es/glosario/edns/"
  de: "https://tldlog.com/de/glossar/edns/"
  fr: "https://tldlog.com/fr/glossaire/edns/"
  it: "https://tldlog.com/it/glossario/edns/"
  pt-BR: "https://tldlog.com/pt/glossario/edns/"
  ru: "https://tldlog.com/ru/glossariy/edns/"
---

# EDNS

DNS扩展机制

对原有DNS协议的扩展，使DNS消息可以更大并携带额外选项。DNSSEC依赖它，它还承载有关用户所在网络的提示等功能。处理不当的服务器和防火墙可能导致查询失败。

## 相关术语

- [DNS](https://tldlog.com/zh/cihui/dns/)
- [DNSSEC](https://tldlog.com/zh/cihui/dnssec/)
- [解析器](https://tldlog.com/zh/cihui/jiexiqi/)
- [权威服务器](https://tldlog.com/zh/cihui/quanwei-fuwuqi/)