PING hk1.upku.cn (8.210.194.30) 56(84) bytes of data.
64 bytes from 8.210.194.30 (8.210.194.30): icmp_seq=1 ttl=57 time=251 ms
64 bytes from 8.210.194.30 (8.210.194.30): icmp_seq=2 ttl=57 time=251 ms
64 bytes from 8.210.194.30 (8.210.194.30): icmp_seq=3 ttl=57 time=251 ms

--- hk1.upku.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 251.288/251.434/251.693/0.607 ms