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arping
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===
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通过发送ARP协议报文测试网络
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## 说明
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**arping命令** 是用于发送arp请求到一个相邻主机的工具，arping使用arp数据包，通过ping命令检查设备上的硬件地址。能够测试一个ip地址是否是在网络上已经被使用，并能够获取更多设备信息。功能类似于ping。
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### 语法
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```
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arping(选项)(参数)
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```
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```
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-b：用于发送以太网广播帧（FFFFFFFFFFFF）。arping一开始使用广播地址，在收到响应后就使用unicast地址。
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-q：quiet output不显示任何信息；
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-f：表示在收到第一个响应报文后就退出；
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-w timeout：设定一个超时时间，单位是秒。如果到了指定时间，arping还没到完全收到响应则退出；
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-c count：表示发送指定数量的ARP请求数据包后就停止。如果指定了deadline选项，则arping会等待相同数量的arp响应包，直到超时为止；
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-s source：设定arping发送的arp数据包中的SPA字段的值。如果为空，则按下面处理，如果是DAD模式（冲突地址探测），则设置为0.0.0.0，如果是Unsolicited ARP模式（Gratutious ARP）则设置为目标地址，否则从路由表得出；
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-I interface：设置ping使用的网络接口。
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```
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### 参数
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目的主机：指定发送ARP报文的目的主机。
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### 实例
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```
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[root@localhost ~]# arping www.baidu.com
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ARPING 220.181.111.147 from 173.231.43.132 eth0
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Unicast reply from 220.181.111.147 00:D0:03:[bc:48:00] 1.666ms
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Unicast reply from 220.181.111.147 [00:D0:03:BC:48:00] 1.677ms
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Unicast reply from 220.181.111.147 [00:D0:03:BC:48:00] 1.691ms
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Unicast reply from 220.181.111.147 [00:D0:03:BC:48:00] 1.728ms
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Unicast reply from 220.181.111.147 [00:D0:03:BC:48:00] 1.626ms
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Unicast reply from 220.181.111.147 [00:D0:03:BC:48:00] 1.292ms
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Unicast reply from 220.181.111.147 [00:D0:03:BC:48:00] 1.429ms
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Unicast reply from 220.181.111.147 [00:D0:03:BC:48:00] 2.042ms
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Sent 8 probes (1 broadcast(s))
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Received 8 response(s)
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```
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