Linux ping命令：测试主机间网络连通性

Linux ping 命令用于检测主机。

执行 ping 指令会使用 ICMP 传输协议，发出要求回应的信息，若远端主机的网络功能没有问题，就会回应该信息，因而得知该主机运作正常。

语法格式：ping [参数] [目标主机]

常用参数：

参考实例

检测与www.bunian.cn网站的连通性：

[root@bunian ~]# # ping www.bunian.cn //ping主机
PING www.bunian.cn (81.70.4.224) 56(84) bytes of data.
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=1 ttl=50 time=46.2 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=2 ttl=50 time=46.0 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=3 ttl=50 time=46.1 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=4 ttl=50 time=45.9 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=5 ttl=50 time=46.0 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=6 ttl=50 time=46.0 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=7 ttl=50 time=45.9 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=8 ttl=50 time=46.0 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=10 ttl=50 time=45.9 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=11 ttl=50 time=46.0 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=12 ttl=50 time=46.1 ms

--- www.bunian.cn ping statistics ---
12 packets transmitted, 11 received, 8% packet loss, time 11012ms
rtt min/avg/max/mdev = 45.914/46.033/46.251/0.259 ms

//需要手动终止Ctrl+C

连续ping3次：

[root@bunian ~]# ping -c 3 www.bunian.cn 
PING www.bunian.cn (81.70.4.224) 56(84) bytes of data.
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=1 ttl=50 time=46.2 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=2 ttl=50 time=45.9 ms
64 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=3 ttl=50 time=45.8 ms

--- www.bunian.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 45.873/46.046/46.282/0.172 ms

//收到三次包后，自动退出

设置次数为4，时间间隔为3秒：

[root@bunian ~]# ping -c 4 -i 3 www.bunian.cn

利用ping命令获取指定网站的IP地址：

[root@bunian ~]# ping -c 1 www.bunian.cn | grep from | cut -d " " -f 4
81.70.4.224

多参数使用

[root@bunian ~]# ping -i 3 -c 3 -s 1024 -t 255 www.bunian.cn //ping主机
PING www.bunian.cn (81.70.4.224) 1024(1052) bytes of data.
1032 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=1 ttl=50 time=46.4 ms
1032 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=2 ttl=50 time=46.1 ms
1032 bytes from 81.70.4.224 (81.70.4.224): icmp_seq=3 ttl=50 time=46.0 ms

--- www.bunian.cn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 6006ms
rtt min/avg/max/mdev = 46.070/46.216/46.464/0.176 ms

//-i 3 发送周期为3秒 -c 3 ping3次 -s 设置发送包的大小 -t 设置TTL值为 255