PING incheon.ac.kr (117.16.191.4) 56(84) bytes of data.
64 bytes from mportal.incheon.ac.kr (117.16.191.4): icmp_seq=1 ttl=53 time=257 ms
64 bytes from mportal.incheon.ac.kr (117.16.191.4): icmp_seq=2 ttl=53 time=257 ms
64 bytes from mportal.incheon.ac.kr (117.16.191.4): icmp_seq=3 ttl=53 time=256 ms

--- incheon.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 256.854/257.135/257.434/0.477 ms