PING pro-agent.site.cdncenter.cn (103.112.28.92) 56(84) bytes of data.
64 bytes from 103.112.28.92 (103.112.28.92): icmp_seq=1 ttl=56 time=256 ms
64 bytes from 103.112.28.92 (103.112.28.92): icmp_seq=2 ttl=56 time=256 ms
64 bytes from 103.112.28.92 (103.112.28.92): icmp_seq=3 ttl=56 time=257 ms

--- pro-agent.site.cdncenter.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 256.052/256.603/257.131/0.604 ms