arping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。
语法：
[root@ha01 ~]# arping
Usage: arping [-fqbDUAV] [-c count] [-w timeout] [-I device] [-s source] destination
-f : quit on first reply
-q : be quiet
-b : keep broadcasting, don't go unicast
-D : duplicate address detection mode
-U : Unsolicited ARP mode, update your neighbours
-A : ARP answer mode, update your neighbours
-V : print version and exit
-c count : how many packets to send
-w timeout : how long to wait for a reply
-I device : which ethernet device to use (eth0)
-s source : source ip address
destination : ask for what ip address
该命令的各选项含义如下：
-f 表示在收到第一个响应包后就退出；
-q quiet output 不显示任何信息；
-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。
-c count表示发送指定数量的 ARP 请求数据包后就停止。如果制定了deadline选项，则arping会等待相同数量的arp响应包，直到超时为止；
-d hostname 删除指定 hostname 的所有入口；
-w timeout设定一个超时时间，单位是秒。如果到了指定时间，arping 还没有完全收到响应则退出；
-V 显示版本信息
-H type设置和查询arp缓存时检查 type 类型的地址；
-a ［hostname] 显示指定 hostname 的所有入口；
-s hostname hw_addr 手工加入 hostname 的地址映射；
范例1 ：发送ARP请求
[root@ha01 ~]# arping 10.0.0.101
ARPING 10.0.0.101 from 10.0.0.121 eth0
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.121ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 0.804ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.431ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.019ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.289ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 0.831ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.480ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.024ms
范例2 ：向指定主机发送ARP请求，当收到第一个包自动退出
[root@ha01 ~]# arping -f 10.0.0.101
ARPING 10.0.0.101 from 10.0.0.121 eth0
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.145ms
Sent 1 probes (1 broadcast(s))
Received 1 response(s)
范例3 ： 指定发送次数
[root@ha01 ~]# arping -c 5 10.0.0.101
ARPING 10.0.0.101 from 10.0.0.121 eth0
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.145ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.041ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.345ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.004ms
Unicast reply from 10.0.0.101 [78:E4:00:4C:9E:E9] 1.014ms
Sent 5 probes (1 broadcast(s))
Received 5 response(s)