https://just-taiming.medium.com/note-dns-protection-%E7%B6%B2%E8%B7%AF%E5%AE%89%E5%85%A8%E7%9A%84%E7%AC%AC%E4%B8%80%E9%81%93%E9%98%B2%E7%B7%9A-6b0284de6b7b
