PING www.smtt.co.kr (221.139.49.6) 56(84) bytes of data.
64 bytes from 221.139.49.6 (221.139.49.6): icmp_seq=1 ttl=46 time=257 ms
64 bytes from 221.139.49.6 (221.139.49.6): icmp_seq=2 ttl=46 time=257 ms
64 bytes from 221.139.49.6 (221.139.49.6): icmp_seq=3 ttl=46 time=257 ms

--- www.smtt.co.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 257.718/257.796/257.930/0.425 ms