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ARP (Address Resolution Protocol) is a protocol to lookup the link layer address of an internet / network layer address.
It translates a layer-3 address into a layer-2 address and is mainly used to lookup the MAC address of an IPv4 address.

In IPv6 networks NDP does a similar job. The reverse of ARP is the obsolete RARP protocol.


ARP is one of the sources to fill the MAC address list maintained by multid or rextd.


FRITZ!OS is based on Linux which maintains an ARP cache. It could be accessed by:

root@fritz1:/var/mod/root# cat /proc/net/arp

IP address       HW type     Flags       HW address            Mask     Device    0x1         0x2         00:24:be:xx:xx:xx     *        guest  0x1         0x2         00:23:8b:xx:xx:xx     *        lan  0x1         0x2         44:39:c4:xx:xx:xx     *        lan    0x1         0x2         c8:0e:14:xx:xx:xx     *        lan  0x1         0x2         00:1a:a0:xx:xx:xx     *        lan    0x1         0x2         cc:ce:1e:xx:xx:xx     *        lan


A tool to list and manipulate the ARP cache is the arp command:

root@fritz1:/var/mod/root# arp -a

? ( at 00:24:be:xx:xx:xx [ether]  on guest
pc2.fritz.box (  at 00:23:8b:xx:xx:xx [ether]  on lan
pc1.fritz.box (  at 44:39:c4:xx:xx:xx [ether]  on lan
fritz2.fritz.box ( at c8:0e:14:xx:xx:xx [ether]  on lan
pc3.fritz.box (  at 00:1a:a0:xx:xx:xx [ether]  on lan
fritz5.fritz.box ( at cc:ce:1e:xx:xx:xx [ether]  on lan

See also the arp(8) man page.


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