PING www.bdsweb.cn (104.21.17.239) 56(84) bytes of data.
64 bytes from 104.21.17.239 (104.21.17.239): icmp_seq=1 ttl=59 time=4.12 ms
64 bytes from 104.21.17.239 (104.21.17.239): icmp_seq=2 ttl=59 time=3.97 ms
64 bytes from 104.21.17.239 (104.21.17.239): icmp_seq=3 ttl=59 time=4.05 ms

--- www.bdsweb.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 3.979/4.052/4.127/0.060 ms