ping

ping 主要用于检查网络

1. ping www.baidu.com

 ping www.baidu.com
PING www.a.shifen.com (220.181.112.244) 56(84) bytes of data.
64 bytes from 220.181.112.244: icmp_seq=1 ttl=52 time=21.0 ms
64 bytes from 220.181.112.244: icmp_seq=2 ttl=52 time=20.9 ms
64 bytes from 220.181.112.244: icmp_seq=3 ttl=52 time=20.9 ms
64 bytes from 220.181.112.244: icmp_seq=4 ttl=52 time=21.0 ms
64 bytes from 220.181.112.244: icmp_seq=5 ttl=52 time=21.0 ms
64 bytes from 220.181.112.244: icmp_seq=6 ttl=52 time=20.9 ms
64 bytes from 220.181.112.244: icmp_seq=7 ttl=52 time=21.0 ms
64 bytes from 220.181.112.244: icmp_seq=8 ttl=52 time=21.0 ms
64 bytes from 220.181.112.244: icmp_seq=9 ttl=52 time=21.0 ms
64 bytes from 220.181.112.244: icmp_seq=10 ttl=52 time=20.9 ms
64 bytes from 220.181.112.244: icmp_seq=11 ttl=52 time=20.9 ms
^C
--- www.a.shifen.com ping statistics ---
11 packets transmitted, 11 received, 0% packet loss, time 10014ms
rtt min/avg/max/mdev = 20.904/20.997/21.049/0.128 ms

medv（Ｍｅａｎ　Ｄｅｖiation,表示ＩＣＭＰ包的RTT偏离平均值的成都)的值用于衡量网速的稳定性，越小越好

２. 　常见的参数：

　　　　　-c :指定ping的次数，例如:ping 百度 4次，   ping  -c  3 www.baidu.com

                  -q:直接查看结果

　　　　　-s:指定ｐｉｎｇ的数据包大小，　例如:ping 百度１个字节,   ping -s 1024 www.baidu.com

                 -t:指定TTL（数据包在被丢弃以前在路由器之间的转换次数）的数

　　　　　-i:指定ping的时间间隔