1.\" Copyright (c) 1985, 1991, 1993 2.\" The Regents of the University of California. 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 8.1 (Berkeley) 6/6/93 33.\" $Id: arp.8,v 1.4 1994/05/13 08:09:21 mycroft Exp $ 34.\" 35.Dd June 6, 1993 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.Nm arp 47.Fl d Ar hostname 48.Nm arp 49.Fl s Ar hostname ether_addr 50.Op Ar temp 51.Op Ar pub 52.Op Ar trail 53.Nm arp 54.Fl f Ar filename 55.Sh DESCRIPTION 56The 57.Nm arp 58program displays and modifies the Internet-to-Ethernet address translation 59tables used by the address resolution protocol 60.Pq Xr arp 4 . 61With no flags, the program displays the current 62.Tn ARP 63entry for 64.Ar hostname . 65The host may be specified by name or by number, 66using Internet dot notation. 67.Pp 68Available options: 69.Bl -tag -width Ds 70.It Fl a 71The program displays all of the current 72.Tn ARP 73entries. 74.It Fl d 75A super-user may delete an entry for the host called 76.Ar hostname 77with the 78.Fl d 79flag. 80.It Fl s Ar hostname ether_addr 81Create an 82.Tn ARP 83entry for the host called 84.Ar hostname 85with the Ethernet address 86.Ar ether_addr . 87The Ethernet address is given as six hex bytes separated by colons. 88The entry will be permanent unless the word 89.Ar temp 90is given in the command. 91If the word 92.Ar pub 93is given, the entry will be "published"; i.e., this system will 94act as an 95.Tn ARP 96server, 97responding to requests for 98.Ar hostname 99even though the host address is not its own. 100The word 101.Ar trail 102indicates that trailer encapsulations may be sent to this host. 103.It Fl f 104Causes the file 105.Ar filename 106to be read and multiple entries to be set in the 107.Tn ARP 108tables. Entries 109in the file should be of the form 110.Pp 111.Bd -filled -offset indent -compact 112.Ar hostname ether_addr 113.Op Ar temp 114.Op Ar pub 115.Op Ar trail 116.Ed 117.Pp 118with argument meanings as given above. 119.El 120.Sh SEE ALSO 121.Xr inet 3 , 122.Xr arp 4 , 123.Xr ifconfig 8 124.Sh HISTORY 125The 126.Nm 127command appeared in 128.Bx 4.3 . 129