387 lines
12 KiB
Groff
387 lines
12 KiB
Groff
.\" $FreeBSD$
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.\" $KAME: rtadvd.conf.5,v 1.35 2001/05/25 07:40:22 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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.Dd May 17, 1998
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.Dt RTADVD.CONF 5
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.Os
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.Sh NAME
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.Nm rtadvd.conf
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.Nd config file for router advertisement daemon
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.Sh DESCRIPTION
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This file describes how the router advertisement packets must be constructed
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for each of the interfaces.
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.Pp
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As described in
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.Xr rtadvd 8 ,
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you do not have to set this configuration file up at all,
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unless you need some special configurations.
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You may even omit the file as a whole.
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In such cases, the
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.Nm rtadvd
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daemon will automatically configure itself using default values
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specified in the specification.
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.Pp
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It obeys the famous
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.Xr termcap 5
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file format.
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Each line in the file describes a network interface.
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Fields are separated by a colon
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.Pq Sq \&: ,
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and each field contains one capability description.
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Lines may be concatenated by the
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.Sq \e
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character.
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The comment marker is the
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.Sq \&#
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character.
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.Sh CAPABILITIES
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Capabilities describe the value to be filled into ICMPv6 router
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advertisement messages and to control
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.Xr rtadvd 8
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behavior.
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Therefore, you are encouraged to read IETF neighbor discovery documents
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if you would like to modify the sample configuration file.
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.Pp
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Note that almost all items have default values.
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If you omit an item, the default value of the item will be used.
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.Pp
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There are two items which control the interval of sending router advertisements.
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These items can be omitted, then
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.Nm rtadvd
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will use the default values.
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.Bl -tag -width indent
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.It Cm \&maxinterval
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(num) The maximum time allowed between sending unsolicited
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multicast router advertisements
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(unit: seconds).
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The default value is 600.
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Its value must be no less than 4 seconds
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and no greater than 1800 seconds.
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.It Cm \&mininterval
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(num) The minimum time allowed between sending unsolicited multicast
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router advertisements
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(unit: seconds).
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The default value is the one third of value of
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.Cm maxinterval .
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Its value must be no less than 3 seconds and no greater than .75 *
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the value of
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.Cm maxinterval .
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.El
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.Pp
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The following items are for ICMPv6 router advertisement message
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header.
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These items can be omitted, then
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.Nm rtadvd
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will use the default values.
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.Bl -tag -width indent
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.It Cm \&chlim
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(num) The value for Cur Hop Limit field.
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The default value is 64.
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.It Cm \&raflags
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(num) Flags field in router advertisement message header.
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Bit 7
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.Pq Li 0x80
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means Managed address configuration flag bit,
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and Bit 6
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.Pq Li 0x40
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means Other stateful configuration flag bit.
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Bit 4
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.Pq Li 0x10
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and Bit 3
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.Pq Li 0x08
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are used to encode router preference.
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0x01 means high, 0x00 means medium, and 0x11 means low.
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The default value is 0.
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.It Cm \&rltime
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(num) Router lifetime field
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(unit: seconds).
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Its value must be no greater than 3600000.
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When
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.Nm rtadvd
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runs on a host, this value must explicitly set 0 on all the
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advertising interfaces as described in
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.Xr rtadvd 8 .
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The default value is 1800.
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.It Cm \&rtime
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(num) Reachable time field
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(unit: milliseconds).
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The default value is 0, which means unspecified by this router.
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.It Cm \&retrans
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(num) Retrans Timer field
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(unit: milliseconds).
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The default value is 0, which means unspecified by this router.
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.El
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.Pp
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The following items are for ICMPv6 prefix information option,
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which will be attached to router advertisement header.
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These items can be omitted, then
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.Nm rtadvd
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will automatically get appropriate prefixes from the kernel's routing table,
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and advertise the prefixes with the default parameters.
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.Bl -tag -width indent
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.It Cm \&clockskew
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(num) Time skew to adjust link propagation delays and clock skews
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between routers on the link
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(unit: seconds).
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This value is used in consistency check for locally-configured and
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advertised prefix lifetimes, and has its meaning when the local router
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configures a prefix on the link with a lifetime that decrements in
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real time.
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If the value is 0, it means the consistency check will be skipped
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for such prefixes.
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The default value is 0.
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.It Cm \&addrs
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(num) Number of prefixes.
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Its default is 0, so it must explicitly be set to positive values
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if you want to specify any prefix information option.
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If its value is 0,
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.Xr rtadvd 8
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looks up the system routing table and
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advertise the prefixes corresponding to interface routes
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on the interface.
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If its value is more than 1, you must specify the index of the prefix
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for each item below.
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Indices vary from 0 to N-1, where N is the
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value of
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.Cm addrs .
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Each index shall follow the name of each item, e.g.,
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.Dq prefixlen2 .
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.It Cm \&prefixlen
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(num) Prefix length field.
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The default value is 64.
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.It Cm \&pinfoflags
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(num) Flags field in prefix information option.
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Bit 7
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.Pq Li 0x80
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means On-link flag bit,
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and Bit 6
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.Pq Li 0x40
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means Autonomous address-configuration flag bit.
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The default value is 0xc0, i.e., both bits are set.
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.It Cm \&addr
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(str) The address filled into Prefix field.
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Since
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.Dq \&:
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is used for
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.Xr termcap 5
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file format as well as IPv6 numeric address, the field MUST be quoted by
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doublequote character.
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This field cannot be
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omitted if the value of
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.Cm addrs
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is more than 0.
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.It Cm \&vltime
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(num) Valid lifetime field
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(unit: seconds).
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The default value is 2592000 (30 days).
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.It Cm \&vltimedecr
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(bool) This item means the advertised valid lifetime will decrements
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in real time, which is disabled by default.
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.It Cm \&pltime
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(num) Preferred lifetime field
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(unit: seconds).
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The default value is 604800 (7 days).
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.It Cm \&pltimedecr
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(bool) This item means the advertised preferred lifetime will decrements
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in real time, which is disabled by default.
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.El
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.Pp
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The following item is for ICMPv6 MTU option,
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which will be attached to router advertisement header.
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This item can be omitted, then
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.Nm rtadvd
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will use the default value.
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.Bl -tag -width indent
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.It Cm \&mtu
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(num or str) MTU (maximum transmission unit) field.
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If 0 is specified, it means that the option will not be included.
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The default value is 0.
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If the special string
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.Dq auto
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is specified for this item, MTU option will be included and its value
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will be set to the interface MTU automatically.
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.El
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.Pp
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The following item controls ICMPv6 source link-layer address option,
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which will be attached to router advertisement header.
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As noted above, you can just omit the item, then
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.Nm rtadvd
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will use the default value.
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.Bl -tag -width indent
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.It Cm \&nolladdr
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(bool) By default
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(if
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.Cm \&nolladdr
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is not specified),
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.Xr rtadvd 8
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will try to get link-layer address for the interface from the kernel,
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and attach that in source link-layer address option.
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If this capability exists,
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.Xr rtadvd 8
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will not attach source link-layer address option to
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router advertisement packets.
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.El
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.Pp
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The following item controls ICMPV6 home agent information option,
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which was defined with mobile IPv6 support.
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It will be attached to router advertisement header just like other options do.
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.Bl -tag -width indent
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.It Cm \&hapref
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(num) Specifies home agent preference.
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If set to non-zero,
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.Cm \&hatime
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must be present as well.
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.It Cm \&hatime
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(num) Specifies home agent lifetime.
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.El
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.Pp
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When mobile IPv6 support is turned on for
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.Xr rtadvd 8 ,
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advertisement interval option will be attached to router advertisement
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packet, by configuring
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.Cm \&maxinterval
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explicitly.
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.Pp
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The following items are for ICMPv6 route information option,
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which will be attached to router advertisement header.
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These items are optional.
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.Bl -tag -width indent
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.It Cm \&routes
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(num) Number of routes.
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Its default is 0, so it must explicitly be set to positive values
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if you want to specify any route information option.
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If its value is 0, no route information is sent.
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If its value is more than 1, you must specify the index of the routes
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for each item below.
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Indices vary from 0 to N-1, where N is the
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value of
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.Cm routes.
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Each index shall follow the name of each item, e.g.,
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.Dq rtrplen2 .
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.It Cm \&rtrplen
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(num) Prefix length field in route information option.
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The default value is 64.
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.It Cm \&rtrflags
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(num) Flags field in route information option.
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Bit 4
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.Pq Li 0x10
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and
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and Bit 3
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.Pq Li 0x08
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are used to encode router preference for the route.
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The default value is 0x00, i.e. medium router preference.
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.It Cm \&rtrprefix
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(str) The prefix filled into the Prefix field of route information option.
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Since
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.Dq \&:
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is used for
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.Xr termcap 5
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file format as well as IPv6 numeric address, the field MUST be quoted by
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doublequote character.
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This field cannot be
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omitted if the value of
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.Cm addrs
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is more than 0.
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.It Cm \&rtrltime
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(num) route lifetime field in route information option.
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(unit: seconds).
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The default value is 2592000 (30 days). (not specified in draft-draves-router-selection-01.txt now)
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.El
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You can also refer one line from another by using
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.Cm tc
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capability.
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See
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.Xr termcap 5
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for details on the capability.
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.Sh EXAMPLES
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As presented above, all of the advertised parameters have default values
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defined in specifications, and hence you usually do not have to set them
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by hand, unless you need special non-default values.
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It can cause interoperability problem if you use an ill-configured
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parameter.
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.Pp
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To override a configuration parameter, you can specify the parameter alone.
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With the following configuration,
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.Xr rtadvd 8
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overrides the router lifetime parameter for the
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.Li ne0
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interface.
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.Bd -literal -offset
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ne0:\\
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:rltime#0:
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.Ed
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.Pp
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The following example manually configures prefixes advertised from the
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.Li ef0
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interface.
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The configuration must be used with the
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.Fl s
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option to
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.Xr rtadvd 8 .
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.Bd -literal -offset
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ef0:\\
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:addrs#1:addr="3ffe:501:ffff:1000::":prefixlen#64:
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.Ed
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.Pp
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The following example presents the default values in an explicit manner.
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The configuration is provided just for reference purposes;
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YOU DO NOT NEED TO HAVE IT AT ALL.
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.Bd -literal -offset
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default:\\
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:chlim#64:raflags#0:rltime#1800:rtime#0:retrans#0:\\
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:pinfoflags#192:vltime#2592000:pltime#604800:mtu#0:
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ef0:\\
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:addrs#1:addr="3ffe:501:ffff:1000::":prefixlen#64:tc=default:
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.Ed
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.Sh SEE ALSO
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.Xr termcap 5 ,
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.Xr rtadvd 8 ,
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.Xr rtsol 8
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.Pp
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Thomas Narten, Erik Nordmark and W. A. Simpson,
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.Do
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Neighbor Discovery for IP version 6 (IPv6)
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.Dc ,
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RFC 2461
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.Pp
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Richard Draves,
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.Do
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Default Router Preferences and More-Specific Routes
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.Dc ,
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draft-ietf-ipngwg-router-selection-01.txt
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.Sh HISTORY
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The
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.Xr rtadvd 8
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and the configuration file
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.Nm
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first appeared in WIDE Hydrangea IPv6 protocol stack kit.
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.\" .Sh BUGS
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.\" (to be written)
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