PING underground-7.ppxw.sinaapp.com (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.012 ms
64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.041 ms
64 bytes from localhost (127.0.0.1): icmp_seq=3 ttl=64 time=0.032 ms

--- underground-7.ppxw.sinaapp.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2007ms
rtt min/avg/max/mdev = 0.012/0.028/0.041/0.012 ms