PING wopop-proxy.cdncenter.cn (8.209.107.39) 56(84) bytes of data.
64 bytes from 8.209.107.39 (8.209.107.39): icmp_seq=1 ttl=57 time=10.4 ms
64 bytes from 8.209.107.39 (8.209.107.39): icmp_seq=2 ttl=57 time=9.83 ms
64 bytes from 8.209.107.39 (8.209.107.39): icmp_seq=3 ttl=57 time=9.92 ms

--- wopop-proxy.cdncenter.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 9.832/10.068/10.447/0.294 ms