PING mmlab.snu.ac.kr (147.46.114.27) 56(84) bytes of data.
64 bytes from mail.mmlab.snu.ac.kr (147.46.114.27): icmp_seq=1 ttl=53 time=251 ms
64 bytes from mail.mmlab.snu.ac.kr (147.46.114.27): icmp_seq=2 ttl=53 time=249 ms
64 bytes from mail.mmlab.snu.ac.kr (147.46.114.27): icmp_seq=3 ttl=53 time=247 ms

--- mmlab.snu.ac.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 247.221/249.234/251.142/1.703 ms