Detect Duplicate IP Address With arping command

A practical issue, especially for large network. arping sends ARP REQUEST to a neighbor host / computers.

$ sudo arping -I eth0 -c 3 192.168.1.1

ARPING 192.168.1.1 from 192.168.1.106 ra0
Unicast reply from 192.168.1.1 [00:18:39:6A:C6:8B]  2.232ms
Unicast reply from 192.168.1.1 [00:18:39:6A:C6:8B]  1.952ms
Sent 3 probes (1 broadcast(s))
Received 3 response(s)

• -I eth0 : Specify network interface i.e. name of network device where to send ARP REQUEST packets. This option is required.
• -c 3 : Stop after sending 3 ARP REQUEST packets

-D specifies duplicate address detection mode (DAD). It returns exit status 0, if DAD succeeded i.e. no replies are received. Always use following syntax for duplicate address detection with arping:
$ sudo arping -D -I <interface-name> -c 2 <IP-ADDRESS-TO-TEST>
$ echo $?