resolution display and control
ether_addr [temp |
program displays and modifies the
Internet-to-Ethernet address translation tables used by the address resolution
displays the current ARP entry for
when no optional parameters are
may be specified by name
or by number, using Internet dot notation.
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:
- Display all of the current ARP entries. See also the
-d option below. The following information
will be printed:
- The network address of the host.
- Ethernet Address
- The Ethernet address of the host. If the address is not
available, it will be displayed as “(incomplete)”.
- The network interface associated with the ARP
- The time until expiry of the entry. If the entry is
marked “permanent” or “static”, it will never
- Flags on the ARP entry, in a single letter. They are:
local (‘l’) and published (‘p’).
- Delete an entry for the host called
hostname. Alternatively, the
-d flag may be combined with the
-a flag to delete all entries, with hostname
lookups automatically disabled. Only the superuser may delete
- Force existing entries for the given host to be overwritten
(only relevant to the -f and
- Process entries from file
to be set in the ARP tables. See the -s
option for a description of the file format and the effect of the
- Show network addresses as numbers (normally
arp attempts to display addresses
- Create an ARP entry for the host called
hostname with the Ethernet address
ether_addr. The Ethernet address is given
as six hexadecimal bytes separated by colons. The entry will be static
(will not time out) unless the word temp is
given in the command. A static ARP entry can be overwritten by network
traffic, unless the word permanent is given.
If the word pub is 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 replaced
unless -F is given.
- Select the routing domain.
- Send the Wake on LAN frame from all interfaces on the local
machine that are up, if iface has not
been specified. Otherwise the frame will be sent from
ether_addr is the Ethernet address of the
remote machine or a hostname entry in
/etc/ethers. This option cannot be used in
combination with any other option.
- Ethernet host name database.
View the current arp(4)
showing network addresses symbolically:
$ arp -a
Create a permanent entry (one that cannot be overwritten by other network
# arp -s 10.0.0.2 00:90:27:bb:cc:dd
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
command appeared in
. Wake on LAN functionality was added in