mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
9711a168b9
Since ARP and routing are separated, "proxy only" entries don't have any meaning, thus we don't need additional field in sockaddr to pass SIN_PROXY flag. New kernel is binary compatible with old tools, since sizes of sockaddr_inarp and sockaddr_in match, and sa_family are filled with same value. The structure declaration is left for compatibility with third party software, but in tree code no longer use it. Reviewed by: ru, andre, net@
193 lines
4.8 KiB
Groff
193 lines
4.8 KiB
Groff
.\" Copyright (c) 1985, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)arp.8 8.1 (Berkeley) 6/6/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 31, 2013
|
|
.Dt ARP 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm arp
|
|
.Nd address resolution display and control
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl n
|
|
.Op Fl i Ar interface
|
|
.Ar hostname
|
|
.Nm
|
|
.Op Fl n
|
|
.Op Fl i Ar interface
|
|
.Fl a
|
|
.Nm
|
|
.Fl d Ar hostname
|
|
.Op Cm pub
|
|
.Nm
|
|
.Fl d
|
|
.Op Fl i Ar interface
|
|
.Fl a
|
|
.Nm
|
|
.Fl s Ar hostname ether_addr
|
|
.Op Cm temp
|
|
.Op Cm blackhole No \&| Cm reject
|
|
.Op Cm pub
|
|
.Nm
|
|
.Fl S Ar hostname ether_addr
|
|
.Op Cm temp
|
|
.Op Cm blackhole No \&| Cm reject
|
|
.Op Cm pub
|
|
.Nm
|
|
.Fl f Ar filename
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility displays and modifies the Internet-to-Ethernet address translation
|
|
tables used by the address resolution protocol
|
|
.Pq Xr arp 4 .
|
|
With no flags, the program displays the current
|
|
.Tn ARP
|
|
entry for
|
|
.Ar hostname .
|
|
The host may be specified by name or by number,
|
|
using Internet dot notation.
|
|
.Pp
|
|
Available options:
|
|
.Bl -tag -width indent
|
|
.It Fl a
|
|
The program displays or deletes all of the current
|
|
.Tn ARP
|
|
entries.
|
|
.It Fl d
|
|
A super-user may delete an entry for the host called
|
|
.Ar hostname
|
|
with the
|
|
.Fl d
|
|
flag.
|
|
If the
|
|
.Cm pub
|
|
keyword is specified, only the
|
|
.Dq published
|
|
.Tn ARP
|
|
entry
|
|
for this host will be deleted.
|
|
.Pp
|
|
Alternatively, the
|
|
.Fl d
|
|
flag may be combined with the
|
|
.Fl a
|
|
flag to delete all entries.
|
|
.It Fl i Ar interface
|
|
Limit the operation scope to the
|
|
.Tn ARP
|
|
entries on
|
|
.Ar interface .
|
|
Applicable only to the following operations:
|
|
display one, display all, delete all.
|
|
.It Fl n
|
|
Show network addresses as numbers (normally
|
|
.Nm
|
|
attempts to display addresses symbolically).
|
|
.It Fl s Ar hostname ether_addr
|
|
Create an
|
|
.Tn ARP
|
|
entry for the host called
|
|
.Ar hostname
|
|
with the Ethernet address
|
|
.Ar ether_addr .
|
|
The Ethernet address is given as six hex bytes separated by colons.
|
|
The entry will be permanent unless the word
|
|
.Cm temp
|
|
is given in the command.
|
|
If the word
|
|
.Cm pub
|
|
is given, the entry will be
|
|
.Dq published ;
|
|
i.e., this system will
|
|
act as an
|
|
.Tn ARP
|
|
server,
|
|
responding to requests for
|
|
.Ar hostname
|
|
even though the host address is not its own.
|
|
In this case the
|
|
.Ar ether_addr
|
|
can be given as
|
|
.Cm auto
|
|
in which case the interfaces on this host will be examined,
|
|
and if one of them is found to occupy the same subnet, its
|
|
Ethernet address will be used.
|
|
.Pp
|
|
If the
|
|
.Cm reject
|
|
keyword is specified the entry will be marked so that traffic to
|
|
the host will be discarded and the sender will be notified the
|
|
host is unreachable.
|
|
The
|
|
.Cm blackhole
|
|
keyword is similar in that traffic is discarded but the sender is
|
|
not notified.
|
|
These can be used to block external traffic to a host without
|
|
using a firewall.
|
|
.It Fl S Ar hostname ether_addr
|
|
Is just like
|
|
.Fl s
|
|
except any existing
|
|
.Tn ARP
|
|
entry for this host will be deleted first.
|
|
.It Fl f Ar filename
|
|
Cause the file
|
|
.Ar filename
|
|
to be read and multiple entries to be set in the
|
|
.Tn ARP
|
|
tables.
|
|
Entries
|
|
in the file should be of the form
|
|
.Pp
|
|
.Bd -ragged -offset indent -compact
|
|
.Ar hostname ether_addr
|
|
.Op Cm temp
|
|
.Op Cm blackhole No \&| Cm reject
|
|
.Op Cm pub
|
|
.Ed
|
|
.Pp
|
|
with argument meanings as given above.
|
|
Leading whitespace and empty lines are ignored.
|
|
A
|
|
.Ql #
|
|
character will mark the rest of the line as a comment.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr inet 3 ,
|
|
.Xr arp 4 ,
|
|
.Xr ifconfig 8 ,
|
|
.Xr ndp 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
utility appeared in
|
|
.Bx 4.3 .
|