1.\" $NetBSD: arp.8,v 1.23 2013/07/08 04:31:12 apb 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 July 8, 2013 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.Fl a 49.Nm 50.Op Fl v 51.Fl d Ar hostname 52.Op Cm proxy 53.Nm 54.Fl s Ar hostname ether_addr 55.Op Cm temp 56.Op Cm pub Op Cm proxy 57.Nm 58.Fl f Ar filename 59.Sh DESCRIPTION 60The 61.Nm 62program displays and modifies the Internet-to-Ethernet address translation 63tables used by the address resolution protocol 64.Pq Xr arp 4 . 65With no flags, the program displays the current 66.Tn ARP 67entry for 68.Ar hostname . 69The host may be specified by name or by number, 70using Internet dot notation. 71.Pp 72Available options: 73.Bl -tag -width Ds 74.It Fl a 75The program displays all of the current 76.Tn ARP 77entries. 78.It Fl d 79A super-user may delete an entry for the host called 80.Ar hostname 81with the 82.Fl d 83flag. 84If the 85.Cm proxy 86keyword is specified, only the published 87.Dq proxy only 88.Tn ARP 89entry 90for this host will be deleted. 91If used with 92.Fl a 93instead of a 94.Ar hostname , 95it will delete all arp entries. 96.It Fl f 97Causes the file 98.Ar filename 99to be read and multiple entries to be set in the 100.Tn ARP 101tables. 102Entries in the file should be of the form 103.Pp 104.Bd -filled -offset indent -compact 105.Ar hostname ether_addr 106.Op Cm temp 107.Op Cm pub 108.Ed 109.Pp 110with argument meanings as described below. 111.It Fl n 112Show network addresses as numbers (normally 113.Nm 114attempts to display addresses symbolically). 115.It Fl s Ar hostname ether_addr 116Create an 117.Tn ARP 118entry for the host called 119.Ar hostname 120with the Ethernet address 121.Ar ether_addr . 122The Ethernet address is given as six hex bytes separated by colons. 123The entry will be permanent unless the word 124.Cm temp 125is given in the command. 126If the word 127.Cm pub 128is given, the entry will be "published"; i.e., this system will 129act as an 130.Tn ARP 131server, 132responding to requests for 133.Ar hostname 134even though the host address is not its own. 135If the word 136.Cm proxy 137is also given, the published entry will be a 138.Dq proxy only 139entry. 140.It Fl v 141Display verbose information when adding or deleting 142.Tn ARP 143entries. 144.El 145.Sh SEE ALSO 146.Xr inet 3 , 147.Xr arp 4 , 148.Xr ifconfig 8 149.Sh HISTORY 150The 151.Nm 152command appeared in 153.Bx 4.3 . 154