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Linux如何系统级接入DoH? - 知乎 DNS over TLS（DoT）是一种加密的DNS通信协议，它使用TLS协议来封装和传输DNS查询请求和响应。类似于DoH，DoT可以保护用户的隐私和安全，避免被中间人攻击或窃听。与DoH不同的是，DoT使用TLS作为底层传输协议，而不是HTTP。DoT的常用端口是853。 二、Linux系统级开启DoT