arping - Unix, Linux Command


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arping: send ARP REQUEST to a neighbour host.



arping comamnd pings the destination on device interface by ARP packets, using source address. This command is similar to the ping command, except that the "arping" command performs the action at the Ethernet layer. Another difference between "ping" and "arping" is that, the ping command tests the reachability of an IP address, whereas "arping" reports the reachability and round-trip time of an IP address hosted on the local network. The "arping" command could be used to display the reachability of an IP on the local Ethernet.


Tag Description
-A The same as -U, but ARP REPLY packets used instead of ARP REQUEST.
-b Send only MAC level broadcasts. Normally arping starts from sending broadcast, and switch to unicast after reply received.
-c count Stop after sending count ARP REQUEST packets. With deadline option, arping waits for count ARP REPLY packets, until the timeout expires.
-D Duplicate address detection mode (DAD). See RFC2131, 4.4.1. Returns 0, if DAD succeeded i.e. no replies are received.
-f Finish after the first reply confirming that target is alive.
-I Interface Name of network device where to send ARP REQUEST packets..
-h Print help page and exit.
-q Quiet output. Nothing is displayed.
-s source IP source address to use in ARP packets. If this option is absent, source address is:

In DAD mode (with option -D) set to

In Unsolicited ARP mode (with options -U or -A) set to destination.

Otherwise, it is calculated from routing tables.

-U Unsolicited ARP mode to update neighbours' ARP caches. No replies are expected.
-V Print version of the program and exit.
-w deadline Specify a timeout, in seconds, before arping exits regardless of how many packets have been sent or received. In this case arping does not stop after count packet are sent, it waits either for deadline expire or until count probes are answered.



* To display reachability of an IP on the local Ethernet with arping:

# arping -I eth0 -c 2

ARPING from eth0 Unicast reply from [00:80:C8:E8:4B:8E] 8.419ms Unicast reply from [00:80:C8:E8:4B:8E] 2.095ms Sent 2 probes (1 broadcast(s)) Received 2 response(s)


To detect Duplicate Address with arping

Syntax- sudo arping -D -I <interface-name> -c 2 <IP-ADDRESS-TO-TEST>

#arping -D -q -I eth0 -c 2

If duplicated you should see zero exit status.

(arping can detect if an IP address is currently in use on an Ethernet. Called duplicate address detection, this use of arping is increasingly common in networking scripts.)

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