223 lines
5.9 KiB
Groff
223 lines
5.9 KiB
Groff
.\" $NetBSD: rtsold.8,v 1.30 2010/01/11 14:30:02 wiz Exp $
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.\" $KAME: rtsold.8,v 1.17 2001/07/09 22:30:37 itojun 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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.Dd January 11, 2010
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.Dt RTSOLD 8
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.Os
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.\"
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.Sh NAME
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.Nm rtsold
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.Nd router solicitation daemon
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.\"
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.Sh SYNOPSIS
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.Nm rtsold
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.Op Fl 1Ddfm
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.Ar interface ...
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.Nm rtsold
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.Op Fl 1Ddfm
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.Fl a
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.Nm rtsol
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.Op Fl Dd
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.Ar interface ...
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.Nm rtsol
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.Op Fl Dd
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.Fl a
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.\"
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.Sh DESCRIPTION
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.Nm
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is the daemon program to send ICMPv6 Router Solicitation messages
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on the specified interfaces.
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If a node (re)attaches to a link,
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.Nm
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sends some Router Solicitations on the link destined to the link-local scope
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all-routers multicast address to discover new routers
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and to get non link-local addresses.
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.Pp
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.Nm
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should be used on IPv6 hosts
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.Pq non-router nodes
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only.
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.Pp
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If you invoke the program as
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.Nm rtsol ,
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it will transmit probes from the specified
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.Ar interface ,
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without becoming a daemon.
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In other words,
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.Nm rtsol
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behaves as
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.Dq rtsold -f1 interface ... .
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.Pp
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Specifically,
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.Nm
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sends at most 3 Router Solicitations on an interface
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after one of the following events:
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.Bl -bullet
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.It
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Just after invocation of the
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.Nm
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daemon.
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.It
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The interface is up after a temporary interface failure.
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.Nm
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detects such failures by periodically probing to see if the status
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of the interface is active or not.
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Note that some network cards and drivers do not allow the extraction
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of link state.
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In such cases,
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.Nm
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cannot detect the change of the interface status.
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.It
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Every 60 seconds if the
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.Fl m
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option is specified and the
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.Nm
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daemon cannot get the interface status.
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This feature does not conform to the IPv6 neighbor discovery
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specification, but is provided for mobile stations.
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The default interval for router advertisements, which is on the order of 10
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minutes, is slightly long for mobile stations.
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This feature is provided
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for such stations so that they can find new routers as soon as possible
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when they attach to another link.
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.El
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.Pp
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Once
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.Nm
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has sent a Router Solicitation, and has received a valid Router Advertisement,
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it refrains from sending additional solicitations on that interface, until
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the next time one of the above events occurs.
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.Pp
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When sending a Router Solicitation on an interface,
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.Nm
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includes a Source Link-layer address option if the interface
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has a link-layer address.
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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/rtsold.dump .
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Also note that
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.Nm
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will not be able to update the kernel routing tables unless
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.Xr sysctl 8
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reports that
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net.inet6.ip6.accept_rtadv=1.
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.\"
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl 1
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Perform only one probe.
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Transmit Router Solicitation packets until at least one valid Router
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Advertisement packet has arrived on each
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.Ar interface ,
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then exit.
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.It Fl a
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Autoprobe outgoing interface.
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.Nm
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will try to find a non-loopback, non-point-to-point, IPv6-capable interface.
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If
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.Nm
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finds multiple interfaces,
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.Nm
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will exit with an error.
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.It Fl D
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Enable more debugging (than that offered by the
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.Fl d
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option) including the printing of internal timer information.
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.It Fl d
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Enable debugging.
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.It Fl f
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This option prevents
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.Nm
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from becoming a daemon (foreground mode).
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Warning messages are generated to standard error
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instead of
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.Xr syslog 3 .
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.It Fl m
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Enable mobility support.
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If this option is specified,
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.Nm
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sends probing packets to default routers that have advertised Router
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Advertisements
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when the node (re)attaches to an interface.
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Moreover, if the option is specified,
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.Nm
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periodically sends Router Solicitation on an interface that does not support
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the
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.Dv SIOCGIFMEDIA
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ioctl.
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.El
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.\"
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.Sh EXIT STATUS
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.Ex -std rtsold
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.\"
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.Sh FILES
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.Bl -tag -width /var/run/rtsold.dumpXX -compact
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.It Pa /var/run/rtsold.pid
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The PID of the currently running
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.Nm rtsold .
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.It Pa /var/run/rtsold.dump
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Internal state dump file.
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.El
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.\"
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.Sh SEE ALSO
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.Xr rtadvd 8 ,
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.Xr sysctl 8
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.\"
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.Sh HISTORY
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The
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.Nm
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command is based on the
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.Nm rtsol
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command, which first appeared in the WIDE/KAME IPv6 protocol stack kit.
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.Nm rtsol
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is now integrated into
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.Nm .
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.\"
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.Sh BUGS
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In some operating systems, when a PCMCIA network card is removed
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and reinserted, the corresponding interface index is changed.
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However,
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.Nm
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assumes such changes will not occur, and always uses the index that
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it got at invocation.
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As a result,
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.Nm
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may not work if you reinsert a network card.
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In such a case,
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.Nm
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should be killed and restarted.
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.Pp
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You may see kernel error messages if you try to autoconfigure a host with
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multiple interfaces.
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