PING web20vn.com--xuexuefei.cn.gongchang.com (106.52.20.19) 56(84) bytes of data.
64 bytes from 106.52.20.19 (106.52.20.19): icmp_seq=1 ttl=52 time=247 ms
64 bytes from 106.52.20.19 (106.52.20.19): icmp_seq=2 ttl=52 time=245 ms
64 bytes from 106.52.20.19 (106.52.20.19): icmp_seq=3 ttl=52 time=245 ms

--- web20vn.com--xuexuefei.cn.gongchang.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 245.703/246.366/247.578/1.031 ms