ARP

ARP

Address Resolution Protocol

  ARP is a protocol that can obtain the information of a MAC address from the destination IP address.

  This is one of the basic protocols in the AG/AR series. (The other basic protocols are IPv4, UDP and TCP.)

Example of executing the command

The following example shows a list of devices displayed on Linux.

The MAC address corresponding to the IP address is displayed. (This correspond to the existing command, "arp -a".)

admin@amnimo:~$ ip n
192.168.1.18 dev eth0 lladdr ff:ff:ff:ff:ff:ff STALE   ← The MAC address is an example.
192.168.1.10 dev eth0 lladdr bb:bb:bb:bb:bb;bb REACHABLE
(Omitted)

The contents of the ARP table are displayed on a Windows PC.

c:\>arp -a

Interface: 192.168.10.1 --- 0x6
Internet Address      Physical Address    Type
192.168.10.254       bb-bb-bb-bb-bb-bb    dynamic
192.168.10.255       ff-ff-ff-ff-ff-ff    dynamic
(Omitted)

What is Proxy ARP?

Proxy ARP is a function to send an ARP response to an ARP request addressed to other devices on behalf of the original contact destination. Using Proxy ARP will enable devices on a subnet to reach another remote subnet without configuring the routing settings and a default gateway.

This function is supported on the AG/AR series.