PING mana.snu.ac.kr (147.47.107.108) 56(84) bytes of data.
64 bytes from mana.snu.ac.kr (147.47.107.108): icmp_seq=1 ttl=52 time=251 ms
64 bytes from mana.snu.ac.kr (147.47.107.108): icmp_seq=2 ttl=52 time=248 ms
64 bytes from mana.snu.ac.kr (147.47.107.108): icmp_seq=3 ttl=52 time=248 ms

--- mana.snu.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 248.297/249.732/251.902/1.560 ms