|ARP(8)||System Manager's Manual||ARP(8)|
arp — address
resolution display and control
arp program displays and modifies the
Internet-to-Ethernet address translation tables used by the address
resolution protocol (ARP).
arp displays the current ARP entry for
hostname when no optional parameters are supplied.
hostname may be specified by name or by number, using
Internet dot notation.
arp can also be used to send Wake on LAN
(WoL) frames over a local Ethernet network to one or more hosts using their
link layer (hardware) addresses. WoL functionality is generally enabled in a
machine's BIOS and can be used to power on machines from a remote system
without having physical access to them.
The options are as follows:
-doption below. The following information will be printed:
-dflag may be combined with the
-aflag to delete all entries, with hostname lookups automatically disabled. Only the superuser may delete entries.
-soption for a description of the file format and the effect of the
arpattempts to display addresses symbolically).
-shostname ether_addr [
tempis given in the command. A static ARP entry can be overwritten by network traffic, unless the word
permanentis given. If the word
pubis given, the entry will be “published”; that is, this system will act as an ARP server, responding to requests for hostname even though the host address is not its own. This behavior has traditionally been called proxy ARP.
If the entry already exists for the given host, it will not be
-F is given.
View the current arp(4) table, showing network addresses symbolically:
$ arp -a
Create a permanent entry (one that cannot be overwritten by other network traffic):
# arp -s 10.0.0.2 00:90:27:bb:cc:dd permanent
Create proxy ARP entries on interface fxp0 (MAC address 00:90:27:bb:cc:dd), for IP addresses 18.104.22.168 and 22.214.171.124:
# arp -s 126.96.36.199 00:90:27:bb:cc:dd pub # arp -s 188.8.131.52 00:90:27:bb:cc:dd pub
arp command appeared in
4.3BSD. Wake on LAN functionality was added in
|April 5, 2016||OpenBSD-6.5|