PING www.gctc.co.kr (211.115.125.42) 56(84) bytes of data.
64 bytes from project.yescall.com (211.115.125.42): icmp_seq=1 ttl=55 time=256 ms
64 bytes from project.yescall.com (211.115.125.42): icmp_seq=2 ttl=55 time=256 ms
64 bytes from project.yescall.com (211.115.125.42): icmp_seq=3 ttl=55 time=256 ms

--- www.gctc.co.kr ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 6263ms
rtt min/avg/max/mdev = 256.134/256.393/256.829/0.516 ms