arp(7p) [hpux man page]

arp(7P) 																   arp(7P)

NAME

       arp - Address Resolution Protocol

DESCRIPTION

       ARP is a protocol used to dynamically map between DARPA Internet and hardware station addresses.  It is used by all LAN drivers.

       ARP caches Internet-to-hardware station address mappings.  When an interface requests a mapping for an address not in the cache, ARP queues
       the message that requires the mapping, and broadcasts a message on the associated network requesting the address mapping if the	encapsula-
       tion  method has been enabled for the interface.  If a response is provided, the new mapping is cached and any pending message is transmit-
       ted.  ARP queues at most one packet while waiting for a mapping request to be responded to; only the most recently  ``transmitted''  packet
       is kept.

       To  facilitate  communications with systems that do not use ARP, calls are provided to enter and delete entries in the Internet-to-hardware
       station address tables.

   Application Usage:
       Each call takes the same structure as an argument.  sets an ARP entry, gets an ARP entry, and deletes an ARP entry.   These  calls  can	be
       applied to any socket descriptor s, but only by the super-user.	The structure contains:

       The  address  family for the must be for the it must be The only flag bits that can be written are and Fibre Channel hosts only support the
       flag.  causes the entry to be permanent.  specifies that the ARP code should respond to ARP requests for the  indicated	host  coming  from
       other  machines.   This	allows	a host to act as an ARP server, which may be useful in convincing an ARP-only machine to talk to a non-ARP
       machine.

       ARP watches passively for hosts impersonating the local host (i.e., a host that responds to an ARP mapping request  for	the  local  host's
       address).

DIAGNOSTICS

       This message printed on the console screen means that
	    ARP has discovered another host on the local network that responds to mapping requests for its own Internet address.

WARNINGS

       To enable the encapsulation method, use the command (see ifconfig(1M)).

AUTHOR

       ARP was developed by the University of California, Berkeley.

SEE ALSO

       ifconfig(1M), inet(3N), lan(7), arp(1M).

       RFC826, Dave Plummer, Network Information Center, SRI.

																	   arp(7P)

arp(1M) 																   arp(1M)

NAME

       arp - address resolution display and control

SYNOPSIS

       hostname

       [system]

       [system [core]]

       | hostname

       filename

       hostname hw_address rif_address]

       hostname nport_id

DESCRIPTION

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

   Options
       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.

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

	      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.

	      (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.  Conse-
			quently, communication with remote systems is possible only when that communication is	initiated  by  the  local  system.
			This option should be used with extreme caution.

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

			Other entries in the file should be of the form:

			       hostname hw_address
			       rif_address]

			The argument meanings are the same as for the option.

	      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 is given in the command.

			If  the  word  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 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 hexa-
			decimal bytes separated by colons, up to a maximum of 16 bytes.

	      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 and options.

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

AUTHOR

       was developed by HP and the University of California, Berkeley.

SEE ALSO

       ifconfig(1M), inet(3N), hosts(4), arp(7P), ndp(1M).

																	   arp(1M)