1.\" $NetBSD: arp.8,v 1.7 1995/03/01 11:50:59 chopps Exp $ 2.\" 3.\" Copyright (c) 1985, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)arp.8 8.1 (Berkeley) 6/6/93 35.\" 36.Dd June 6, 1993 37.Dt ARP 8 38.Os BSD 4.3 39.Sh NAME 40.Nm arp 41.Nd address resolution display and control 42.Sh SYNOPSIS 43.Nm arp 44.Op Fl n 45.Ar hostname 46.Nm arp 47.Op Fl n 48.Fl a 49.Nm arp 50.Fl d Ar hostname 51.Nm arp 52.Fl s Ar hostname ether_addr 53.Op Ar temp 54.Op Ar pub 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. 76.It Fl d 77A super-user may delete an entry for the host called 78.Ar hostname 79with the 80.Fl d 81flag. 82.It Fl n 83Show network addresses as numbers (normally 84.Nm arp 85attempts to display addresses symbolically). 86.It Fl s Ar hostname ether_addr 87Create an 88.Tn ARP 89entry for the host called 90.Ar hostname 91with the Ethernet address 92.Ar ether_addr . 93The Ethernet address is given as six hex bytes separated by colons. 94The entry will be permanent unless the word 95.Ar temp 96is given in the command. 97If the word 98.Ar pub 99is given, the entry will be "published"; i.e., this system will 100act as an 101.Tn ARP 102server, 103responding to requests for 104.Ar hostname 105even though the host address is not its own. 106.It Fl f 107Causes the file 108.Ar filename 109to be read and multiple entries to be set in the 110.Tn ARP 111tables. Entries 112in the file should be of the form 113.Pp 114.Bd -filled -offset indent -compact 115.Ar hostname ether_addr 116.Op Ar temp 117.Op Ar pub 118.Ed 119.Pp 120with argument meanings as given above. 121.El 122.Sh SEE ALSO 123.Xr inet 3 , 124.Xr arp 4 , 125.Xr ifconfig 8 126.Sh HISTORY 127The 128.Nm 129command appeared in 130.Bx 4.3 . 131