.\" Copyright (c) 1985, 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)arp.8 8.2 (Berkeley) 4/27/95 .\" .Dd April 27, 1995 .Dt ARP 8 .Os BSD 4.3 .Sh NAME .Nm arp .Nd address resolution display and control .Sh SYNOPSIS .Nm arp .Ar hostname .Nm arp .Fl a .Nm arp .Fl d Ar hostname .Nm arp .Fl s Ar hostname ether_addr .Op Ar temp .Op Ar pub .Nm arp .Fl f Ar filename .Sh DESCRIPTION The .Nm arp program displays and modifies the Internet-to-Ethernet address translation tables used by the address resolution protocol .Pq Xr arp 4 . With no flags, the program displays the current .Tn ARP entry for .Ar hostname . The host may be specified by name or by number, using Internet dot notation. .Pp Available options: .Bl -tag -width Ds .It Fl a The program displays all of the current .Tn ARP entries. .It Fl d A super-user may delete an entry for the host called .Ar hostname with the .Fl d flag. .It Fl s Ar hostname ether_addr Create an .Tn ARP entry for the host called .Ar hostname with the Ethernet address .Ar ether_addr . The Ethernet address is given as six hex bytes separated by colons. The entry will be permanent unless the word .Ar temp is given in the command. If the word .Ar pub is given, the entry will be "published"; i.e., this system will act as an .Tn ARP server, responding to requests for .Ar hostname even though the host address is not its own. .It Fl f Causes the file .Ar filename to be read and multiple entries to be set in the .Tn ARP tables. Entries in the file should be of the form .Pp .Bd -filled -offset indent -compact .Ar hostname ether_addr .Op Ar temp .Op Ar pub .Ed .Pp with argument meanings as given above. .El .Sh SEE ALSO .Xr inet 3 , .Xr arp 4 , .Xr ifconfig 8 .Sh HISTORY The .Nm command appeared in .Bx 4.3 .