a2ac74c148
Reviewed by: wblock, gnn, allanjude, phil Approved by: allanjude MFC after: 1 week Sponsored by: Rubicon Communications (Netgate) Differential Revision: https://reviews.freebsd.org/D9563
204 lines
5.0 KiB
Groff
204 lines
5.0 KiB
Groff
.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)arp.8 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd April 6, 2017
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.Dt ARP 8
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.Os
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.Sh NAME
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.Nm arp
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.Nd address resolution display and control
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.Sh SYNOPSIS
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.Nm
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.Op Fl -libxo Ar options
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.Op Fl n
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.Op Fl i Ar interface
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.Ar hostname
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.Nm
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.Op Fl -libxo Ar options
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.Op Fl n
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.Op Fl i Ar interface
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.Fl a
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.Nm
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.Fl d Ar hostname
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.Op Cm pub
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.Nm
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.Fl d
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.Op Fl i Ar interface
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.Fl a
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.Nm
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.Fl s Ar hostname ether_addr
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.Op Cm temp
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.Op Cm blackhole No \&| Cm reject
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.Op Cm pub
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.Nm
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.Fl S Ar hostname ether_addr
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.Op Cm temp
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.Op Cm blackhole No \&| Cm reject
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.Op Cm pub
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.Nm
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.Fl f Ar filename
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.Sh DESCRIPTION
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The
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.Nm
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utility displays and modifies the Internet-to-Ethernet address translation
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tables used by the address resolution protocol
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.Pq Xr arp 4 .
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With no flags, the program displays the current
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.Tn ARP
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entry for
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.Ar hostname .
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The host may be specified by name or by number,
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using Internet dot notation.
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.Pp
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Available options:
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.Bl -tag -width indent
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.It Fl -libxo
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Generate output via
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.Xr libxo 3
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in a selection of different human and machine readable formats.
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See
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.Xr xo_parse_args 3
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for details on command line arguments.
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.It Fl a
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The program displays or deletes all of the current
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.Tn ARP
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entries.
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.It Fl d
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A super-user may delete an entry for the host called
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.Ar hostname
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with the
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.Fl d
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flag.
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If the
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.Cm pub
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keyword is specified, only the
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.Dq published
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.Tn ARP
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entry
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for this host will be deleted.
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.Pp
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Alternatively, the
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.Fl d
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flag may be combined with the
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.Fl a
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flag to delete all entries.
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.It Fl i Ar interface
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Limit the operation scope to the
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.Tn ARP
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entries on
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.Ar interface .
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Applicable only to the following operations:
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display one, display all, delete all.
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.It Fl n
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Show network addresses as numbers (normally
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.Nm
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attempts to display addresses symbolically).
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.It Fl s Ar hostname ether_addr
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Create an
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.Tn ARP
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entry for the host called
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.Ar hostname
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with the Ethernet address
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.Ar ether_addr .
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The Ethernet address is given as six hex bytes separated by colons.
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The entry will be permanent unless the word
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.Cm temp
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is given in the command.
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If the word
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.Cm pub
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is given, the entry will be
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.Dq published ;
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i.e., this system will
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act as an
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.Tn ARP
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server,
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responding to requests for
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.Ar hostname
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even though the host address is not its own.
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In this case the
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.Ar ether_addr
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can be given as
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.Cm auto
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in which case the interfaces on this host will be examined,
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and if one of them is found to occupy the same subnet, its
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Ethernet address will be used.
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.Pp
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If the
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.Cm reject
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keyword is specified the entry will be marked so that traffic to
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the host will be discarded and the sender will be notified the
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host is unreachable.
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The
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.Cm blackhole
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keyword is similar in that traffic is discarded but the sender is
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not notified.
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These can be used to block external traffic to a host without
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using a firewall.
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.It Fl S Ar hostname ether_addr
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Is just like
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.Fl s
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except any existing
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.Tn ARP
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entry for this host will be deleted first.
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.It Fl f Ar filename
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Cause the file
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.Ar filename
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to be read and multiple entries to be set in the
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.Tn ARP
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tables.
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Entries
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in the file should be of the form
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.Pp
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.Bd -ragged -offset indent -compact
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.Ar hostname ether_addr
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.Op Cm temp
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.Op Cm blackhole No \&| Cm reject
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.Op Cm pub
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.Ed
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.Pp
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with argument meanings as given above.
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Leading whitespace and empty lines are ignored.
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A
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.Ql #
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character will mark the rest of the line as a comment.
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.El
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.Sh SEE ALSO
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.Xr inet 3 ,
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.Xr libxo 3 ,
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.Xr xo_parse_args 3 ,
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.Xr arp 4 ,
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.Xr ifconfig 8 ,
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.Xr ndp 8
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Bx 4.3 .
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