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```{eval-rst}
.. meta::
:description: The Address Resolution Protocol (ARP) resolves
network-layer addresses to link-layer MAC addresses.
:keywords: arp, network, protocol, mac, address, ipv4, static
```
(routing_static_arp)=
# ARP
The {abbr}`ARP (Address Resolution Protocol)` resolves IPv4 network layer addresses
to link layer MAC addresses.
addresses. This mapping is essential for communication within the Internet
Protocol suite. ARP was standardized in 1982 by {rfc}`826` (STD 37).
:::{note}
In Internet Protocol version 6 (IPv6) networks, address resolution is
performed by the Neighbor Discovery Protocol (NDP).
:::
Use the following commands to configure or view ARP table entries.
## Configuration
```{eval-rst}
.. cfgcmd:: set protocols static arp interface <interface> address <host> mac <mac>
**Configure a static ARP entry on the specified interface.**
This creates a permanent mapping between an IP address and a MAC address
on the specified interface.
Example:
.. code-block:: none
set protocols static arp interface eth0 address 192.0.2.1 mac 01:23:45:67:89:01
```
## Operation
```{eval-rst}
.. opcmd:: show protocols static arp
Show all ARP table entries across all interfaces.
.. code-block:: none
vyos@vyos:~$ show protocols static arp
Address HWtype HWaddress Flags Mask Iface
10.1.1.1 ether 00:53:00:de:23:2e C eth1
10.1.1.100 ether 00:53:00:de:23:aa CM eth1
```
```{eval-rst}
.. opcmd:: show protocols static arp interface <interface>
Show all ARP table entries for the specific interface.
Example for ``eth1``:
.. code-block:: none
vyos@vyos:~$ show protocols static arp interface eth1
Address HWtype HWaddress Flags Mask Iface
10.1.1.1 ether 00:53:00:de:23:2e C eth1
10.1.1.100 ether 00:53:00:de:23:aa CM eth1
```
[arp]: https://en.wikipedia.org/wiki/Address_Resolution_Protocol
|
