PING ok18dy.51.com (152.136.248.78) 56(84) bytes of data.
64 bytes from 152.136.248.78 (152.136.248.78): icmp_seq=1 ttl=54 time=270 ms
64 bytes from 152.136.248.78 (152.136.248.78): icmp_seq=2 ttl=54 time=273 ms
64 bytes from 152.136.248.78 (152.136.248.78): icmp_seq=3 ttl=54 time=267 ms

--- ok18dy.51.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 267.165/270.355/273.665/2.654 ms