arp(1M)                                                             arp(1M)




 NAME    [Toc]    [Back]
      arp - address resolution display and control

 SYNOPSIS    [Toc]    [Back]
      arp hostname

      arp -a[n] [system]

      arp -a[n] [system [core]]   # PA only

      arp [-d | -D] hostname

      arp -f filename

      arp -s hostname hw_address [temp] [pub] [rif rif_address]

      arp -sfc hostname nport_id

 DESCRIPTION    [Toc]    [Back]
      The arp command displays and modifies the Internet-to-Ethernet and
      Internet-to-Fibre Channel address translation tables used by the
      Address Resolution Protocol (ARP).

    Options    [Toc]    [Back]
      arp has the following keyletter options:

           hostname  Display the current ARP entry for hostname, which must
                     appear in the hostname database (see hosts(4)), or for
                     the DARPA Internet address expressed in Internet
                     standard ``dot'' notation.

           -a[n]     Display all current ARP entries by reading the table
                     from /dev/kmem based on the kernel file system (default
                     /stand/vmunix).  On PA systems only: if a core argument
                     is supplied, read the table from core instead of
                     /dev/kmem.  The -an option provides the same
                     information as the -a option except that network
                     addresses are not displayed symbolically.

           -d        If an ARP entry exists for the host called hostname,
                     delete it. This option cannot be used to delete a
                     permanent ARP entry whose IP address is an interface on
                     the local system.

           -D        (Not recommended). Delete a permanent ARP entry whose
                     IP address is an interface on the local system.  The
                     removal of such an ARP entry may result in loss or
                     limitation of network connectivity with remote
                     machines. The local system will no longer respond to
                     ARP requests for this IP address.  Consequently,
                     communication with remote systems is possible only when



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 arp(1M)                                                             arp(1M)




                     that communication is initiated by the local system.
                     This option should be used with extreme caution.

           -f        Read file filename and set multiple entries in the ARP
                     tables.  Fibre Channel entries in the file should be of
                     the form:

                          -sfchostname nport_id

                     Other entries in the file should be of the form:

                          hostname hw_address
                          [temp]
                          [pub]
                          [rif
                          rif_address]

                     The argument meanings are the same as for the -s
                     option.

           -s        Create an ARP entry for the host called hostname with
                     the hardware station address hw_address.  The hardware
                     station address is given as six hexadecimal bytes
                     separated by colons.  If an ARP entry already exists
                     for hostname, the existing entry is updated with the
                     new information.

                     The entry is permanent unless the word temp is given in
                     the command.

                     If the word pub is specified, the entry is published,
                     which means that this system will act as an ARP server
                     responding to requests for hostname even though the
                     host address is not its own.

                     The word rif specifies source routing information used
                     for token ring networks.  This information allows you
                     to specify the particular bridge route which the token
                     ring packet should be delivered.  rif_address is given
                     as an even number of hexadecimal bytes separated by
                     colons, up to a maximum of 16 bytes.

           -sfc      Create a permanent ARP entry for the Fibre Channel host
                     called hostname with the N_Port address nport_id.  The
                     N_Port address is given as three hexadecimal bytes
                     separated by colons.  If an ARP entry already exists
                     for hostname, the existing entry is updated with the
                     new information.

      You need superuser privilege to use the -d, -D, -f, -s and -sfc
      options.



 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003






 arp(1M)                                                             arp(1M)




      See the Neighbor Discovery Protocol (ndp(1M)) for IPv6.

 AUTHOR    [Toc]    [Back]
      arp was developed by HP and the University of California, Berkeley.

 SEE ALSO    [Toc]    [Back]
      ifconfig(1M), inet(3N), hosts(4), arp(7P), ndp(1M).


 Hewlett-Packard Company            - 3 -   HP-UX 11i Version 2: August 2003