PING sdma.sdust.edu.cn (219.218.128.156) 56(84) bytes of data.
64 bytes from 219.218.128.156 (219.218.128.156): icmp_seq=1 ttl=45 time=385 ms
64 bytes from 219.218.128.156 (219.218.128.156): icmp_seq=2 ttl=45 time=377 ms
64 bytes from 219.218.128.156 (219.218.128.156): icmp_seq=3 ttl=45 time=390 ms

--- sdma.sdust.edu.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 3070ms
rtt min/avg/max/mdev = 377.351/384.467/390.164/5.326 ms