428 lines
12 KiB
Groff
428 lines
12 KiB
Groff
.\" $KAME: rtadvd.conf.5,v 1.50 2005/01/14 05:30:59 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.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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.Pq 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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.Pq 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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(str or num) A 8-bit flags field in router advertisement message header.
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This field can be specified either as a case-sensitive string or as an
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integer.
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A sting consists of characters each of which corresponds to a
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particular flag bit(s).
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An integer should be the logical OR of all enabled bits.
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Bit 7
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.Po
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.Li 'm' or 0x80
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.Pc
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means Managed address configuration flag bit,
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and Bit 6
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.Po
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.Li 'o' or 0x40
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.Pc
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means Other stateful configuration flag bit.
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Bit 4
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.Po
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.Li 0x10
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.Pc
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and Bit 3
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.Po
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.Li 0x08
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.Pc
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are used to encode router preference.
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Bits 01
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.Po
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or 'h'
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.Pc
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means high, 00 means medium, and 11
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.Po
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or 'l'
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.Pc
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means low.
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Bits 10 is reserved, and must not be specified.
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There is no character to specify the medium preference explicitly.
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The default value of the entire flag is 0
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.Po
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or a null string,
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.Pc
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which means no additional
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configuration methods, and the medium router preference.
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.It Cm \&rltime
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(num) Router lifetime field
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.Pq unit: seconds .
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The value must be either zero or between
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the value of
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.Cm maxinterval
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and 9000.
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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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.Pq 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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.Pq 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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Keywords other than
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.Cm clockskew
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can be augmented with a number, like
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.Dq Li prefix2 ,
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to specify multiple prefixes.
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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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.Pq 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 \&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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(str or num) A 8-bit flags field in prefix information option.
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This field can be specified either as a case-sensitive string or as an
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integer.
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A sting consists of characters each of which corresponds to a
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particular flag bit(s).
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An integer should be the logical OR of all enabled bits.
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Bit 7
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.Po
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.Li 'l' or 0x80
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.Pc
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means On-link flag bit,
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and Bit 6
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.Po
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.Li 'a' or 0x40
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.Pc
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means Autonomous address-configuration flag bit.
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The default value is "la" or 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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.It Cm \&vltime
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(num) Valid lifetime field
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.Pq 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 decrement
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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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.Pq 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 decrement
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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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.Po
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if
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.Cm \&nolladdr
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is not specified
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.Pc ,
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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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Each items can be augmented with number, like
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.Dq Li rtplen2 ,
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to specify multiple routes.
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.Bl -tag -width indent
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.It Cm \&rtprefix
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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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.It Cm \&rtplen
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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 \&rtflags
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(str or num) A 8-bit flags field in route information option.
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Currently only the preference values are defined.
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The notation is same as that of the raflags field.
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Bit 4
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.Po
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.Li 0x10
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.Pc
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and
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Bit 3
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.Po
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.Li 0x08
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.Pc
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are used to encode the route preference for the route.
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The default value is 0x00, i.e., medium preference.
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.It Cm \&rtltime
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(num) route lifetime field in route information option.
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.Pq unit: seconds .
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Since the specification does not define the default value of this
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item, the value for this item should be specified by hand.
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However,
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.Nm rtadvd
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allows this item to be unspecified, and uses the router lifetime
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as the default value in such a case, just for compatibility with an
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old version of the program.
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.El
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.Pp
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In the above list, each keyword beginning with
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.Dq Li rt
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could be replaced with the one beginning with
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.Dq Li rtr
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for backward compatibility reason.
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For example,
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.Cm rtrplen
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is accepted instead of
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.Cm rtplen .
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However, keywords that start with
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.Dq Li rtr
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have basically been obsoleted, and should not be used any more.
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.Pp
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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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: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="la":vltime#2592000:pltime#604800:mtu#0:
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ef0:\\
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: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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.Rs
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.%A Thomas Narten
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.%A Erik Nordmark
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.%A W. A. Simpson
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.%T Neighbor Discovery for IP version 6 (IPv6)
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.%R RFC 2461
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.Re
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.Rs
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.%A Richard Draves
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.%T Default Router Preferences and More-Specific Routes
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.%R draft-ietf-ipngwg-router-selection-xx.txt
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.Re
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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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