PING postech.ac.kr (141.223.5.51) 56(84) bytes of data.
64 bytes from pec.postech.ac.kr (141.223.5.51): icmp_seq=1 ttl=244 time=291 ms
64 bytes from pec.postech.ac.kr (141.223.5.51): icmp_seq=2 ttl=244 time=291 ms
64 bytes from pec.postech.ac.kr (141.223.5.51): icmp_seq=3 ttl=244 time=290 ms

--- postech.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2400ms
rtt min/avg/max/mdev = 290.756/291.132/291.390/0.271 ms