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.\" 34.Dd June 6, 1993 35.Dt ARP 8 36.Os BSD 4.3 37.Sh NAME 38.Nm arp 39.Nd address resolution display and control 40.Sh SYNOPSIS 41.Nm arp 42.Ar hostname 43.Nm arp 44.Fl a 45.Nm arp 46.Fl d Ar hostname 47.Nm arp 48.Fl s Ar hostname ether_addr 49.Op Ar temp 50.Op Ar pub 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 s Ar hostname ether_addr 83Create an 84.Tn ARP 85entry for the host called 86.Ar hostname 87with the Ethernet address 88.Ar ether_addr . 89The Ethernet address is given as six hex bytes separated by colons. 90The entry will be permanent unless the word 91.Ar temp 92is given in the command. 93If the word 94.Ar pub 95is given, the entry will be "published"; i.e., this system will 96act as an 97.Tn ARP 98server, 99responding to requests for 100.Ar hostname 101even though the host address is not its own. 102In this case the ether_addr can be given as `auto'' 103in which case the interfaces on this host will be examined, 104and if one of them is found to occupy the same subnet, its 105ether_addr will be used. 106.It Fl S Ar hostname ether_addr 107Is just like 108.Fl s 109except any existing arp entry for this host will be deleted first. 110.It Fl f 111Causes the file 112.Ar filename 113to be read and multiple entries to be set in the 114.Tn ARP 115tables. Entries 116in the file should be of the form 117.Pp 118.Bd -filled -offset indent -compact 119.Ar hostname ether_addr 120.Op Ar temp 121.Op Ar pub 122.Ed 123.Pp 124with argument meanings as given above. 125.El 126.Sh SEE ALSO 127.Xr inet 3 , 128.Xr arp 4 , 129.Xr ifconfig 8 130.Sh HISTORY 131The 132.Nm 133command appeared in 134.Bx 4.3 . 135