PING monet.postech.ac.kr (141.223.164.21) 56(84) bytes of data.
64 bytes from monet.postech.ac.kr (141.223.164.21): icmp_seq=1 ttl=54 time=251 ms
64 bytes from monet.postech.ac.kr (141.223.164.21): icmp_seq=2 ttl=54 time=251 ms
64 bytes from monet.postech.ac.kr (141.223.164.21): icmp_seq=3 ttl=54 time=251 ms

--- monet.postech.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 251.394/251.530/251.621/0.587 ms