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arp(8)									arp(8)

NAME
       arp - Displays and controls Address Resolution Protocol (ARP) tables

SYNOPSIS
       /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]

OPTIONS
       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 file‐
       name 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  encapsula‐
	      tion  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	 hard‐
	      ware_addr is in noncanonical form.

DESCRIPTION
       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 host‐
       name.

       The ARP tables can be displayed by any user, but only the superuser can
       modify them.

EXAMPLES
       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 com‐
	      mand.   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 com‐
	      mand.

FILES
       Specifies the command path.

SEE ALSO
       Commands: netstat(1), ifconfig(8)

       Protocols: arp(7)

       Specifications:	RFC 826

									arp(8)
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