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dns 1.1.1.1 延迟很低了，都用了吗？
source link: https://www.v2ex.com/t/552064
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DNS - @keepeye - PING 1.1.1.1 (1.1.1.1): 56 data bytes64 bytes from 1.1.1.1: icmp_seq=0 ttl=251 time=4.348 ms64 b
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