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.\" @(#)arp.8 8.1 (Berkeley) 6/6/93 33.\" $FreeBSD$ 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.Op Fl n 44.Ar hostname 45.Nm arp 46.Op Fl n 47.Fl a 48.Nm arp 49.Fl d Ar hostname 50.Op Ar proxy 51.Nm arp 52.Fl d 53.Fl a 54.Nm arp 55.Fl s Ar hostname ether_addr 56.Op Ar temp 57.Op Ar pub 58.Nm arp 59.Fl S Ar hostname ether_addr 60.Op Ar temp 61.Op Ar pub 62.Nm arp 63.Fl f Ar filename 64.Sh DESCRIPTION 65The 66.Nm 67program displays and modifies the Internet-to-Ethernet address translation 68tables used by the address resolution protocol 69.Pq Xr arp 4 . 70With no flags, the program displays the current 71.Tn ARP 72entry for 73.Ar hostname . 74The host may be specified by name or by number, 75using Internet dot notation. 76.Pp 77Available options: 78.Bl -tag -width Ds 79.It Fl a 80The program displays or deletes all of the current 81.Tn ARP 82entries. 83.It Fl d 84A super-user may delete an entry for the host called 85.Ar hostname 86with the 87.Fl d 88flag. May be combined with the 89.Fl a 90flag to delete all entries. 91.It Fl n 92Show network addresses as numbers (normally 93.Nm 94attempts to display addresses symbolically). 95.It Fl s Ar hostname ether_addr 96Create an 97.Tn ARP 98entry for the host called 99.Ar hostname 100with the Ethernet address 101.Ar ether_addr . 102The Ethernet address is given as six hex bytes separated by colons. 103The entry will be permanent unless the word 104.Ar temp 105is given in the command. 106If the word 107.Ar pub 108is given, the entry will be "published"; i.e., this system will 109act as an 110.Tn ARP 111server, 112responding to requests for 113.Ar hostname 114even though the host address is not its own. 115In this case the ether_addr can be given as ``auto'' 116in which case the interfaces on this host will be examined, 117and if one of them is found to occupy the same subnet, its 118ether_addr will be used. 119.It Fl S Ar hostname ether_addr 120Is just like 121.Fl s 122except any existing arp entry for this host will be deleted first. 123.It Fl f 124Causes the file 125.Ar filename 126to be read and multiple entries to be set in the 127.Tn ARP 128tables. Entries 129in the file should be of the form 130.Pp 131.Bd -filled -offset indent -compact 132.Ar hostname ether_addr 133.Op Ar temp 134.Op Ar pub 135.Ed 136.Pp 137with argument meanings as given above. 138.El 139.Sh SEE ALSO 140.Xr inet 3 , 141.Xr arp 4 , 142.Xr ifconfig 8 143.Sh HISTORY 144The 145.Nm 146command appeared in 147.Bx 4.3 . 148