mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
149 lines
3.6 KiB
Groff
149 lines
3.6 KiB
Groff
.\" Copyright (c) 1990, 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: (1) source code distributions
|
|
.\" retain the above copyright notice and this paragraph in its entirety, (2)
|
|
.\" distributions including binary code include the above copyright notice and
|
|
.\" this paragraph in its entirety in the documentation or other materials
|
|
.\" provided with the distribution. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd November 16, 2001
|
|
.Dt RARPD 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm rarpd
|
|
.Nd reverse ARP daemon
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Fl a
|
|
.Op Fl dfsv
|
|
.Op Fl t Ar directory
|
|
.Nm
|
|
.Op Fl dfsv
|
|
.Op Fl t Ar directory
|
|
.Ar interface
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility services Reverse ARP requests on the Ethernet connected to
|
|
.Ar interface .
|
|
Upon receiving a request,
|
|
.Nm
|
|
maps the target hardware address to an IP address via its name, which
|
|
must be present in both the
|
|
.Xr ethers 5
|
|
and
|
|
.Xr hosts 5
|
|
databases.
|
|
If a host does not exist in both databases, the translation cannot
|
|
proceed and a reply will not be sent.
|
|
.Pp
|
|
By default, a request is honored only if the server
|
|
(i.e., the host that
|
|
.Nm
|
|
is running on)
|
|
can "boot" the target; that is, a file or directory matching the glob
|
|
.Pa /tftpboot/\fIipaddr\fP*
|
|
exists, where
|
|
.Em ipaddr
|
|
is the target IP address in hex.
|
|
For example, the IP address 204.216.27.18 will be replied to if any of
|
|
.Pa /tftpboot/CCD81B12 ,
|
|
.Pa /tftpboot/CCD81B12.SUN3 ,
|
|
or
|
|
.Pa /tftpboot/CCD81B12-boot
|
|
exist.
|
|
This requirement can be overridden with the
|
|
.Fl s
|
|
flag (see below).
|
|
.Pp
|
|
In normal operation,
|
|
.Nm
|
|
forks a copy of itself and runs in the background.
|
|
Anomalies and errors are reported via
|
|
.Xr syslog 3 .
|
|
.Pp
|
|
The following options are available:
|
|
.Bl -tag -width indent
|
|
.It Fl a
|
|
Listen on all the Ethernets attached to the system.
|
|
If
|
|
.Fl a
|
|
is omitted, an interface must be specified.
|
|
.It Fl d
|
|
If
|
|
.Fl f
|
|
is also specified,
|
|
.Nm
|
|
logs messages to
|
|
.Em stdout
|
|
and
|
|
.Em stderr
|
|
instead of via
|
|
.Xr syslog 3 .
|
|
.It Fl f
|
|
Run in the foreground.
|
|
.It Fl s
|
|
Supply a response to any RARP request for which an ethernet to IP address
|
|
mapping exists; do not depend on the existence of
|
|
.Pa /tftpboot/\fIipaddr\fP* .
|
|
.It Fl t
|
|
Supply an alternate tftp root directory to
|
|
.Pa /tftpboot ,
|
|
similar to the
|
|
.Fl s
|
|
option of
|
|
.Xr tftpd 8 .
|
|
This permits
|
|
.Nm
|
|
to selectively respond to RARP requests, but use an alternate directory
|
|
for IP checking.
|
|
.It Fl v
|
|
Enable verbose syslogging.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width /etc/ethers -compact
|
|
.It Pa /etc/ethers
|
|
.It Pa /etc/hosts
|
|
.It Pa /tftpboot
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr bpf 4
|
|
.Rs
|
|
.%A "Finlayson, R."
|
|
.%A "Mann, T."
|
|
.%A "Mogul, J.C."
|
|
.%A "Theimer, M."
|
|
.%T "RFC 903: Reverse Address Resolution Protocol"
|
|
.%D "June 1984"
|
|
.%O "4 p"
|
|
.Re
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
.An Craig Leres Aq leres@ee.lbl.gov
|
|
and
|
|
.An Steven McCanne Aq mccanne@ee.lbl.gov .
|
|
Lawrence Berkeley Laboratory, University of California, Berkeley, CA.
|
|
.Sh BUGS
|
|
The
|
|
.Nm
|
|
utility can depend on the DNS to resolve the name discovered from
|
|
.Pa /etc/ethers .
|
|
If this name is not in the DNS but is in
|
|
.Pa /etc/hosts ,
|
|
the DNS lookup can cause a delayed RARP response, so in this situation
|
|
it is recommended to configure
|
|
.Xr nsswitch.conf 5
|
|
to read
|
|
.Pa /etc/hosts
|
|
first.
|