1.\" Copyright (c) 1985, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)arp.8 6.5 (Berkeley) 3/16/91 33.\" $Id: arp.8,v 1.2 1993/08/01 07:25:34 mycroft Exp $ 34.\" 35.Dd March 16, 1991 36.Dt ARP 8 37.Os BSD 4.3 38.Sh NAME 39.Nm arp 40.Nd address resolution display and control 41.Sh SYNOPSIS 42.Nm arp 43.Ar hostname 44.Nm arp 45.Fl a 46.Op Ar vmunix 47.Op Ar kmem 48.Nm arp 49.Fl d Ar hostname 50.Nm arp 51.Fl s Ar hostname ether_addr 52.Op Ar temp 53.Op Ar pub 54.Op Ar trail 55.Nm arp 56.Fl f Ar filename 57.Sh DESCRIPTION 58The 59.Nm arp 60program displays and modifies the Internet-to-Ethernet address translation 61tables used by the address resolution protocol 62.Pq Xr arp 4 . 63With no flags, the program displays the current 64.Tn ARP 65entry for 66.Ar hostname . 67The host may be specified by name or by number, 68using Internet dot notation. 69.Pp 70Available options: 71.Bl -tag -width Ds 72.It Fl a 73The program displays all of the current 74.Tn ARP 75entries by reading the table 76from the file 77.Ar kmem 78(default /dev/kmem) based on the kernel file 79.Ar vmunix 80(default 81.Pa /vmunix ) . 82.It Fl d 83A super-user may delete an entry for the host called 84.Ar hostname 85with the 86.Fl d 87flag. 88.It Fl s Ar hostname ether_addr 89Create an 90.Tn ARP 91entry for the host called 92.Ar hostname 93with the Ethernet address 94.Ar ether_addr . 95The Ethernet address is given as six hex bytes separated by colons. 96The entry will be permanent unless the word 97.Ar temp 98is given in the command. 99If the word 100.Ar pub 101is given, the entry will be "published"; i.e., this system will 102act as an 103.Tn ARP 104server, 105responding to requests for 106.Ar hostname 107even though the host address is not its own. 108The word 109.Ar trail 110indicates that trailer encapsulations may be sent to this host. 111.It Fl f 112Causes the file 113.Ar filename 114to be read and multiple entries to be set in the 115.Tn ARP 116tables. Entries 117in the file should be of the form 118.Pp 119.Bd -filled -offset indent -compact 120.Ar hostname ether_addr 121.Op Ar temp 122.Op Ar pub 123.Op Ar trail 124.Ed 125.Pp 126with argument meanings as given above. 127.El 128.Sh SEE ALSO 129.Xr inet 3 , 130.Xr arp 4 , 131.Xr ifconfig 8 132.Sh HISTORY 133The 134.Nm 135command appeared in 136.Bx 4.3 . 137