PING liubin.org (192.30.252.153) 56(84) bytes of data.
64 bytes from lb-192-30-252-153-iad.github.com (192.30.252.153): icmp_seq=1 ttl=249
time=89.4 ms
64 bytes from lb-192-30-252-153-iad.github.com (192.30.252.153): icmp_seq=2 ttl=249
time=89.3 ms
64 bytes from lb-192-30-252-153-iad.github.com (192.30.252.153): icmp_seq=3 ttl=249
time=89.2 ms

--- liubin.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 89.268/89.341/89.453/0.256 ms