PING mnt.postech.ac.kr (141.223.73.123) 56(84) bytes of data.
64 bytes from mebk.postech.ac.kr (141.223.73.123): icmp_seq=1 ttl=54 time=256 ms
64 bytes from mebk.postech.ac.kr (141.223.73.123): icmp_seq=2 ttl=54 time=253 ms
64 bytes from mebk.postech.ac.kr (141.223.73.123): icmp_seq=3 ttl=54 time=253 ms

--- mnt.postech.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 3078ms
rtt min/avg/max/mdev = 253.901/254.857/256.755/1.403 ms