PING a30.ccoo.net.cn (39.105.207.21) 56(84) bytes of data.
64 bytes from 39.105.207.21 (39.105.207.21): icmp_seq=1 ttl=50 time=301 ms
64 bytes from 39.105.207.21 (39.105.207.21): icmp_seq=2 ttl=50 time=300 ms
64 bytes from 39.105.207.21 (39.105.207.21): icmp_seq=3 ttl=50 time=300 ms

--- a30.ccoo.net.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 300.754/300.860/301.039/0.645 ms