306 lines
8.3 KiB
Groff
306 lines
8.3 KiB
Groff
.\" $KAME: rtsold.8,v 1.20 2003/04/11 12:46:12 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 July 28, 2017
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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 , rtsol
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.Nd router solicitation daemon
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.\"
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.Sh SYNOPSIS
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.Nm
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.Op Fl dDfFmu1
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.Op Fl O Ar script-name
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.Op Fl p Ar pidfile
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.Op Fl R Ar script-name
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.Ar interface ...
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.Nm
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.Op Fl dDfFmu1
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.Op Fl O Ar script-name
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.Op Fl p Ar pidfile
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.Op Fl R Ar script-name
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.Fl a
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.Nm rtsol
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.Op Fl dDu
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.Op Fl O Ar script-name
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.Op Fl R Ar script-name
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.Ar interface ...
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.Nm rtsol
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.Op Fl dDu
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.Op Fl O Ar script-name
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.Op Fl R Ar script-name
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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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.Do
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.Nm
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.Fl f1
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.Ar interfaces
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.Dc .
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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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.Pp
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.Bl -bullet -compact
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.It
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Just after invocation of
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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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.Lp
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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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.Lp
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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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.Lp
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.Nm
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manages a per-interface parameter to detect if a separate protocol is
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needed for configuration parameters other than host's addresses.
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At the invocation time, the flag is FALSE, and becomes TRUE when
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the daemon receives a router advertisement with the OtherConfig flag
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being set.
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A script file can be specified to deal with the case
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.Pq see below .
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When
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.Nm
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start resending router solicitation messages by one of the conditions
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events,
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the daemon resets the parameter because the event may indicate a
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change on the attached link.
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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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.\"
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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 a
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Autoprobe outgoing interfaces.
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.Nm
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will try to find any non-loopback, non-point-to-point, IPv6-capable interfaces
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and send router solicitation messages on all of them.
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.It Fl d
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Enable debugging.
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.It Fl D
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Enable more debugging including the printing of internal timer information.
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.It Fl f
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Prevent
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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 F
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Explicitly configure the kernel to accept Router Advertisements and
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disable IPv6 forwarding.
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These settings are required for proper
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.Nm
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operation.
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Without this option, the current settings will be obeyed;
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if they are incompatible with proper operation,
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warning messages will be generated,
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but Router Solicitations will still be sent.
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The settings may be changed manually with
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.Xr sysctl 8
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and
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.Xr ifconfig 8 .
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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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.Dv SIOCGIFMEDIA
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ioctl.
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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 O Ar script-name
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Specifies a supplement script file to handle the Other Configuration
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flag of the router advertisement.
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When the flag changes from FALSE to TRUE,
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.Nm
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will invoke
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.Ar script-name
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with a first argument of the receiving interface name
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and a second argument of the sending router address,
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expecting the script will then start a protocol for the other
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configuration.
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.Ar script-name
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must be the absolute path from root to the script file, be a regular
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file, and be created by the same owner who runs
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.Nm .
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.It Fl p Ar pidfile
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Writes the process ID of
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.Nm
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to
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.Pa pidfile
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instead of the default PID file
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.Pa /var/run/rtsold.pid .
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.It Fl R Ar script-name
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Specifies a script to run when router advertisement options
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.Dv RDNSS Pq Recursive DNS Server
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or
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.Dv DNSSL Pq DNS Search List
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are encountered.
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The information of DNS servers and DNS search domains will be sent to
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standard input of this script.
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The
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.Xr resolvconf 8
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script is used by default.
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.It Fl u
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Specifies whether to add the source address of Router Advertisement
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messages to the interface name in the parameters of the RDNSS and DNSSL
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scripts.
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.Pp
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If
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.Fl u
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is specified, the interface name in the script parameters will be
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.Ql ifname:slaac:[RA-source-address] .
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.Pp
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Otherwise it will be
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.Ql ifname:slaac .
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.El
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.Sh FILES
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.Bl -tag -width /var/run/rtsold.dump -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 .
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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 EXIT STATUS
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.Ex -std
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.\"
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.Sh SEE ALSO
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.Xr resolvconf 8 ,
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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 WIDE/KAME IPv6 protocol stack kit.
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.Nm rtsol
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is now integrated into
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.Xr rtsold 8 .
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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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The IPv6 autoconfiguration specification assumes a single-interface host.
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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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Also, it seems contradictory for
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.Nm
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to accept multiple
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.Ar interface
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arguments.
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