PING liuxu.dz.vancelle.net (104.21.67.90) 56(84) bytes of data.
64 bytes from 104.21.67.90 (104.21.67.90): icmp_seq=1 ttl=60 time=4.23 ms
64 bytes from 104.21.67.90 (104.21.67.90): icmp_seq=2 ttl=60 time=4.00 ms
64 bytes from 104.21.67.90 (104.21.67.90): icmp_seq=3 ttl=60 time=4.06 ms

--- liuxu.dz.vancelle.net ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.000/4.100/4.237/0.124 ms