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.. _routing-arp:
###
ARP
###
:abbr:`ARP (Address Resolution Protocol)` is a communication protocol used for
discovering the link layer address, such as a MAC address, associated with a
given internet layer address, typically an IPv4 address. This mapping is a
critical function in the Internet protocol suite. ARP was defined in 1982 by
:rfc:`826` which is Internet Standard STD 37.
In Internet Protocol Version 6 (IPv6) networks, the functionality of ARP is
provided by the Neighbor Discovery Protocol (NDP).
To manipulate or display ARP_ table entries, the following commands are
implemented.
Configure
=========
.. cfgcmd:: set protocols static arp 192.0.2.100 hwaddr 00:53:27:de:23:aa
This will configure a static ARP entry always resolving `192.0.2.100` to
`00:53:27:de:23:aa`
Operation
=========
.. opcmd:: show protocols static arp
Display all known ARP table entries spanning accross all interfaces
.. code-block:: console
vyos@vyos:~$ show protocols static arp
Address HWtype HWaddress Flags Mask Iface
10.1.1.1 ether 08:00:27:de:23:2e C eth1
10.1.1.100 ether 08:00:27:de:23:aa CM eth1
.. opcmd:: show protocols static arp interface eth1
Display all known ARP table entries on a given interface only (`eth1`):
.. code-block:: console
vyos@vyos:~$ show protocols static arp interface eth1
Address HWtype HWaddress Flags Mask Iface
10.1.1.1 ether 08:00:27:de:23:2e C eth1
10.1.1.100 ether 08:00:27:de:23:aa CM eth1
.. _ARP: https://en.wikipedia.org/wiki/Address_Resolution_Protocol
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