PING earth.kw.ac.kr (128.134.63.71) 56(84) bytes of data.
64 bytes from 128.134.63.71 (128.134.63.71): icmp_seq=1 ttl=245 time=248 ms
64 bytes from 128.134.63.71 (128.134.63.71): icmp_seq=2 ttl=245 time=246 ms
64 bytes from 128.134.63.71 (128.134.63.71): icmp_seq=3 ttl=245 time=247 ms

--- earth.kw.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 246.707/247.417/248.372/0.810 ms