arp - Displays and controls Address Resolution Protocol
(ARP) tables
/usr/sbin/arp [-u] [-n] hostname
arp [-a] [-u] [-n] [-i] system
arp [-D] hostname
arp [-d] hostname
arp [-E] hostname
arp [-f] filename
arp [-g] hostname
arp [-s] [-u] [hostname] [hardware_addr] [temp] [pub]
[trail]
Displays all of the current ARP entries. Disables ARP for
hostname. The hostname can be a local host name, alias, or
IP address. If you use this option, the system will no
longer respond to ARP requests for this IP address. This
might cause network connectivity problems with remote systems.
Use of this option requires superuser privilege.
Deletes the entry for hostname if the user issuing the
command has superuser authority. Enables ARP for hostname.
The hostname can be a local host name, alias, or IP
address. By default, the system responds to ARP requests
for all local IP addresses. You can use this option to
enable ARP for a hostname that you previously disabled
with the -D option. Use of this option requires superuser
privilege. Reads entries from filename and adds those
entries to the ARP tables. Use of this option requires
superuser privilege. Entries in the file have the following
format: hostname hardware_addr [temp] [pub] [trail]
Fields in this format are as follows: Specifies the
remote host identified by the entry. Specifies the
hardware address of the remote host. The address
format is 6 hexadecimal bytes separated by colons;
for example, xx:xx:xx:xx:xx:xx. Specifies that
this ARP table entry is temporary. When this argument
is not used, the table entry is permanent.
Indicates that the table entry will be published
and that the current system will act as an ARP
server, responding to requests for hostname even
though the host address is not its own. Indicates
that the trailer encapsulation may be sent to this
host. Sends a gratuitous ARP packet. The hostname
can be a local host name, alias, or IP address.
Displays the interface with which the ARP entry is
associated. Displays numeric IP addresses and
hardware addresses only. When this option is not
specified, arp displays hostnames, numeric IP
addresses, and hardware addresses. Creates a single
ARP entry for hostname. Use of this option
requires superuser privilege. The arguments are
explained in the discussion of the -f option. Displays
the MAC address in noncanonical form with
address bytes reversed and separated by a colon
character (:). By default, all addresses are displayed
in canonical form with address bytes separated
by the hyphen character (-).
When used with the -s option, this indicates that
the hardware_addr is in noncanonical form.
The arp command displays or modifies the current ARP entry
for the host specified by hostname. The host may be specified
by name or number, using Internet dot notation.
With no options, the program displays the current ARP
entry for hostname.
The ARP tables can be displayed by any user, but only the
superuser can modify them.
To display the ARP address-mapping tables for the local
host, enter: arp -a
alpha1.dec.com (16.181.20.2) at 08-00-2b-2c-f5-31
alpha2.dec.com (16.100.21.20) at 08-00-2b-3c-2d-fd To display
the ARP address-mapping tables for the local host and
the interface, enter: arp -a -i
jupiter (192.45.20.2) at 08-00-2b-1a-f8-23 (tu0) sigma
(204.126.98.16) at 08-00-2b-5f-1d-33 (tu1) To add a single
entry for the remote host laszlo to the ARP mapping tables
temporarily, enter: arp -s laszlo 08:00:2b:0f:44:23 temp
The address is considered canonical even though the
bytes are separated by colons. For input, the arp
command does not use the colon (:) and hyphen (-)
characters to indicate whether the address is
canonical or noncanonical.
Note that you must have superuser authority to execute
this command. To add a single entry for the
remote host laszlo to the ARP mapping tables temporarily,
enter: arp -u -s laszlo 10:00:d4:f0:22:c4
temp
The -u option indicates the address is noncanonical.
Note that you must have superuser authority to
execute this command. To add multiple entries to
the ARP mapping tables from the file newentries,
enter: arp -f newentries
Note that you must have superuser authority to execute
this command.
Specifies the command path.
Commands: netstat(1), ifconfig(8)
Protocols: arp(7)
Specifications: RFC 826
arp(8)
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