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[分享发现] 国内 dns 解析国外域名竟然这么慢

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本来用的 AdGuardHome 白名单模式分流国内外域名,腾讯系域名用的 dnspod ,国内其他域名用的 alidns ,其他域名用的 quad9 、cloudflare 、opendns 等国外 dns ,今天突然改成黑名单模式,少数域名用国外 dns ,剩下的腾讯系继续用 dnspod ,其他的都用 alidns 。结果发现打开很多国外网站特别慢,一看查询日志,原来 alidns 解析很多国外域名都是 1000ms+,这不慢才怪了,看来还是白名单模式更适合,虽然会存在部分错杀(部分国内域名由于用了默认的国外 dns 解析到了非最优的国内 ip 上)。

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