PING hdu.edu.cn (218.75.123.169) 56(84) bytes of data.
64 bytes from spam.hziee.edu.cn (218.75.123.169): icmp_seq=1 ttl=54 time=254 ms
64 bytes from spam.hziee.edu.cn (218.75.123.169): icmp_seq=2 ttl=54 time=252 ms
64 bytes from spam.hziee.edu.cn (218.75.123.169): icmp_seq=3 ttl=54 time=252 ms

--- hdu.edu.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 252.086/252.760/254.099/1.031 ms