156 lines
4.6 KiB
Groff
156 lines
4.6 KiB
Groff
.\" $KAME: rtadvd.8,v 1.9 2000/05/27 13:37:01 jinmei Exp $
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.\"
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.\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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.\" 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 project 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 PROJECT 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 PROJECT 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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.\" $FreeBSD$
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.\"
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.Dd May 17, 1998
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.Dt RTADVD 8
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.Os
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.Sh NAME
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.Nm rtadvd
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.Nd router advertisement daemon
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.Sh SYNOPSIS
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.Nm
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.Op Fl c Ar configfile
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.Op Fl dDfRs
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.Ar interface ...
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.Sh DESCRIPTION
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.Nm
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sends router advertisement packets to the specified
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.Ar interfaces .
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.Pp
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The program will daemonize itself on invocation.
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It will then send router advertisement packets periodically, as well
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as in response to router solicitation messages sent by end hosts.
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.Pp
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Router advertisements can be configured on a per-interface basis, as
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described in
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.Xr rtadvd.conf 5 .
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.Pp
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If there is no configuration file entry for an interface,
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or if the configuration file does not exist altogether,
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.Nm
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sets all the parameters to their default values.
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In particular,
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.Nm
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reads all the interface routes from the routing table and advertises
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them as on-link prefixes.
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.Pp
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.Nm
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also watches the routing table.
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By default, if an interface direct route is
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added/deleted on an advertising interface and no static prefixes are
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specified by the configuration file,
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.Nm
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adds/deletes the corresponding prefix to/from its advertising list,
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respectively.
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The
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.Fl s
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option may be used to disable this behavior.
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Moreover, if the status of an advertising interface changes,
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.Nm
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will start or stop sending router advertisements according
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to the latest status.
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.Pp
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The command line options are:
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.Bl -tag -width indent
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.\"
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.It Fl c
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Specify an alternate location,
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.Ar configfile ,
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for the configuration file.
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By default,
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.Pa /etc/rtadvd.conf
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is used.
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.It Fl d
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Print debugging information.
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.It Fl D
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Even more debugging information is printed.
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.It Fl f
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Foreground mode (useful when debugging).
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.\".It Fl m
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.\"Enables mobile IPv6 support.
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.\"This changes the content of router advertisement option, as well as
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.\"permitted configuration directives.
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.It Fl R
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Accept router renumbering requests.
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If you enable it, certain IPsec setup is suggested for security reasons.
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.It Fl s
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Do not add or delete prefixes dynamically.
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Only statically configured prefixes, if any, will be advertised.
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.El
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.Pp
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Upon receipt of signal
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.Dv SIGUSR1 ,
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.Nm
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will dump the current internal state into
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.Pa /var/run/rtadvd.dump .
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.Pp
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Use
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.Dv SIGTERM
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to kill
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.Nm
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gracefully.
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In this case,
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.Nm
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will transmit router advertisement with router lifetime 0
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to all the interfaces
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.Pq in accordance with RFC2461 6.2.5 .
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.Sh RETURN VALUES
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The
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.Nm
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program exits 0 on success, and >0 on failures.
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /etc/rtadvd.conf
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The default configuration file.
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.It Pa /var/run/rtadvd.pid
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contains the pid of the currently running
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.Nm .
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.It Pa /var/run/rtadvd.dump
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in which
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.Nm
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dumps its internal state.
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.El
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.Sh SEE ALSO
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.Xr daemon 3 ,
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.Xr rtadvd.conf 5 ,
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.Xr rtsol 8
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.Sh HISTORY
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The
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.Nm
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command first appeared in WIDE Hydrangea IPv6 protocol stack kit.
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.Sh CAVEAT
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Router advertisements should only be performed downstream.
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Erroneous upstream advertisements will cause
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.Xr icmp6 4
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redirect packet storms in the subnet, as (per the specification) the
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advertising router is assumed to become the default router for
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end hosts in the subnet.
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