好像是局部的 dns 挂了。
我在家可以访问
$ ping
ip.sbPING
ip.sb (172.67.75.172) 56(84) bytes of data.
64 bytes from 172.67.75.172 (172.67.75.172): icmp_seq=1 ttl=56 time=5.91 ms
64 bytes from 172.67.75.172 (172.67.75.172): icmp_seq=2 ttl=56 time=5.31 ms
64 bytes from 172.67.75.172 (172.67.75.172): icmp_seq=3 ttl=56 time=5.38 ms
64 bytes from 172.67.75.172 (172.67.75.172): icmp_seq=4 ttl=56 time=5.31 ms
$ curl
ip.sb111.111.111.211
在公司不行
$ ping
ip.sbping: cannot resolve
ip.sb: Unknown host
$ curl
ip.sbcurl: (6) Could not resolve host:
ip.sb