PING www.f933.cn (172.67.157.21) 56(84) bytes of data.
64 bytes from 172.67.157.21 (172.67.157.21): icmp_seq=1 ttl=60 time=4.47 ms
64 bytes from 172.67.157.21 (172.67.157.21): icmp_seq=2 ttl=60 time=4.57 ms
64 bytes from 172.67.157.21 (172.67.157.21): icmp_seq=3 ttl=60 time=4.52 ms

--- www.f933.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.479/4.528/4.578/0.068 ms