7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
193 lines
4.8 KiB
Groff
193 lines
4.8 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 January 31, 2013
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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 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 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 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 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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