PING ppi.fudan.edu.cn (175.186.248.18) 56(84) bytes of data.
64 bytes from 175.186.248.18 (175.186.248.18): icmp_seq=1 ttl=51 time=254 ms
64 bytes from 175.186.248.18 (175.186.248.18): icmp_seq=2 ttl=51 time=254 ms
64 bytes from 175.186.248.18 (175.186.248.18): icmp_seq=3 ttl=51 time=253 ms

--- ppi.fudan.edu.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 253.879/254.216/254.400/0.475 ms