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lividdns一直设的 8.8.4.4 这阵子v2ex都无法访问 翻墙之后能访问
PING
www.v2ex.com (180.210.229.136): 56 data bytes
64 bytes from 180.210.229.136: icmp_seq=0 ttl=52 time=101.058 ms
64 bytes from 180.210.229.136: icmp_seq=1 ttl=52 time=94.146 ms
64 bytes from 180.210.229.136: icmp_seq=2 ttl=52 time=96.007 ms