PING ngx-out-1.op.58.com (42.187.161.231) 56(84) bytes of data.
64 bytes from 42.187.161.231 (42.187.161.231): icmp_seq=1 ttl=51 time=220 ms
64 bytes from 42.187.161.231 (42.187.161.231): icmp_seq=2 ttl=51 time=221 ms
64 bytes from 42.187.161.231 (42.187.161.231): icmp_seq=3 ttl=51 time=231 ms

--- ngx-out-1.op.58.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 220.705/224.822/231.921/5.041 ms