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.Op Ar trail 52.Nm arp 53.Fl f Ar filename 54.Sh DESCRIPTION 55The 56.Nm arp 57program displays and modifies the Internet-to-Ethernet address translation 58tables used by the address resolution protocol 59.Pq Xr arp 4 . 60With no flags, the program displays the current 61.Tn ARP 62entry for 63.Ar hostname . 64The host may be specified by name or by number, 65using Internet dot notation. 66.Pp 67Available options: 68.Bl -tag -width Ds 69.It Fl a 70The program displays all of the current 71.Tn ARP 72entries. 73.It Fl d 74A super-user may delete an entry for the host called 75.Ar hostname 76with the 77.Fl d 78flag. 79.It Fl s Ar hostname ether_addr 80Create an 81.Tn ARP 82entry for the host called 83.Ar hostname 84with the Ethernet address 85.Ar ether_addr . 86The Ethernet address is given as six hex bytes separated by colons. 87The entry will be permanent unless the word 88.Ar temp 89is given in the command. 90If the word 91.Ar pub 92is given, the entry will be "published"; i.e., this system will 93act as an 94.Tn ARP 95server, 96responding to requests for 97.Ar hostname 98even though the host address is not its own. 99The word 100.Ar trail 101indicates that trailer encapsulations may be sent to this host. 102.It Fl f 103Causes the file 104.Ar filename 105to be read and multiple entries to be set in the 106.Tn ARP 107tables. Entries 108in the file should be of the form 109.Pp 110.Bd -filled -offset indent -compact 111.Ar hostname ether_addr 112.Op Ar temp 113.Op Ar pub 114.Op Ar trail 115.Ed 116.Pp 117with argument meanings as given above. 118.El 119.Sh SEE ALSO 120.Xr inet 3 , 121.Xr arp 4 , 122.Xr ifconfig 8 123.Sh HISTORY 124The 125.Nm 126command appeared in 127.Bx 4.3 . 128