ARP man page on OpenBSD

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ARP(8)			OpenBSD System Manager's Manual			ARP(8)

     arp - address resolution display and control

     arp [-adn] [-V rdomain] hostname
     arp [-F] [-f file] [-V rdomain] -s hostname ether_addr [temp | permanent]
     arp -W ether_addr [iface]

     The arp program displays and modifies the Internet-to-Ethernet address
     translation tables used by the address resolution protocol (ARP).

     arp displays the current ARP entry for hostname when no optional
     parameters are supplied.  hostname may be specified by name or by number,
     using Internet dot notation.

     arp can also 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:

     -a	     Display all of the current ARP entries.  See also the -d option

     -d	     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 entries.

     -F	     Force existing entries for the given host to be overwritten (only
	     relevant to the -f and -s options).

     -f file
	     Process entries from file to be set in the ARP tables.  Any
	     entries in the file that already exist for a given host will not
	     be overwritten unless -F is given.	 Entries in the file should be
	     of the form:

		   hostname ether_addr [temp | permanent] [pub]

	     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.

     -n	     Show network addresses as numbers (normally arp attempts to
	     display addresses symbolically).

     -s hostname ether_addr [temp | permanent] [pub]
	     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 permanent, pub, or temp modifiers may be specified with
	     meanings as given above.

	     If the entry already exists for the given host, it will not be
	     replaced unless -F is given.

     -V rdomain
	     Select the routing domain.	 The default is 0.

     -W ether_addr [iface]
	     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 iface.	 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.

     /etc/ethers  Ethernet host name database.

     View the current arp(4) table, showing network addresses symbolically:

	   $ arp -a

     Create a permanent entry (one that cannot be overwritten by other network

	   # arp -s 00:90:27:bb:cc:dd permanent

     Create proxy ARP entries on interface fxp0 (MAC address
     00:90:27:bb:cc:dd), for IP addresses and

	   # arp -s 00:90:27:bb:cc:dd pub
	   # arp -s 00:90:27:bb:cc:dd pub

     inet(3), arp(4), ethers(5), ifconfig(8), ndp(8)

     The arp command appeared in 4.3BSD.  Wake on Lan functionality was added
     in OpenBSD 4.9.

OpenBSD 4.9		       January 11, 2011			   OpenBSD 4.9

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