1.\" $NetBSD: arp.8,v 1.16 2003/08/07 11:25:12 agc 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. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" from: @(#)arp.8 8.2 (Berkeley) 4/27/95 31.\" 32.Dd April 27, 1995 33.Dt ARP 8 34.Os 35.Sh NAME 36.Nm arp 37.Nd address resolution display and control 38.Sh SYNOPSIS 39.Nm 40.Op Fl n 41.Ar hostname 42.Nm 43.Op Fl nv 44.Fl a 45.Nm 46.Op Fl v 47.Fl d 48.Op Fl a | Ar hostname 49.Nm 50.Fl s Ar hostname ether_addr 51.Op Ar temp 52.Op Ar pub 53.Nm 54.Fl f Ar filename 55.Sh DESCRIPTION 56The 57.Nm 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. If used with 80.Fl a 81instead of a 82.Ar hostname , 83it will delete all arp entries. 84.It Fl n 85Show network addresses as numbers (normally 86.Nm 87attempts to display addresses symbolically). 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. 108.It Fl f 109Causes the file 110.Ar filename 111to be read and multiple entries to be set in the 112.Tn ARP 113tables. Entries 114in the file should be of the form 115.Pp 116.Bd -filled -offset indent -compact 117.Ar hostname ether_addr 118.Op Ar temp 119.Op Ar pub 120.Ed 121.Pp 122with argument meanings as given above. 123.It Fl v 124Display verbose information when adding or deleting 125.Tn ARP 126entries. 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