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RTADVD.CONF(5)			     BSD File Formats Manual			   RTADVD.CONF(5)

NAME
     rtadvd.conf -- config file for router advertisement daemon

DESCRIPTION
     This file describes how the router advertisement packets must be constructed for each of the
     interfaces.

     As described in rtadvd(8), you do not have to set this configuration file up at all, unless
     you need some special configurations.  You may even omit the file as a whole.  In such
     cases, the rtadvd daemon will automatically configure itself using default values specified
     in the specification.

     It obeys the famous termcap(5) file format.  Each line in the file describes a network
     interface.  Fields are separated by a colon (':'), and each field contains one capability
     description.  Lines may be concatenated by the '\' character.  The comment marker is the '#'
     character.

CAPABILITIES
     Capabilities describe the value to be filled into ICMPv6 router advertisement messages and
     to control rtadvd(8) behavior.  Therefore, you are encouraged to read IETF neighbor discov-
     ery documents if you would like to modify the sample configuration file.

     Note that almost all items have default values.  If you omit an item, the default value of
     the item will be used.

     There are two items which control the interval of sending router advertisements.  These
     items can be omitted, then rtadvd will use the default values.

     maxinterval
	     (num) The maximum time allowed between sending unsolicited multicast router adver-
	     tisements (unit: seconds).  The default value is 600.  Its value must be no less
	     than 4 seconds and no greater than 1800 seconds.

     mininterval
	     (num) The minimum time allowed between sending unsolicited multicast router adver-
	     tisements (unit: seconds).  The default value is the one third of value of
	     maxinterval.  Its value must be no less than 3 seconds and no greater than .75 * the
	     value of maxinterval.

     The following items are for ICMPv6 router advertisement message header.  These items can be
     omitted, then rtadvd will use the default values.

     chlim   (num) The value for Cur Hop Limit field.  The default value is 64.

     raflags
	     (num) Flags field in router advertisement message header.	Bit 7 (0x80) means Man-
	     aged address configuration flag bit, and Bit 6 (0x40) means Other stateful configu-
	     ration flag bit.  Bit 4 (0x10) and Bit 3 (0x08) are used to encode router prefer-
	     ence.  0x01 means high, 0x00 means medium, and 0x11 means low.  The default value is
	     0.

     rltime  (num) Router lifetime field (unit: seconds).  Its value must be no greater than
	     3600000.  When rtadvd runs on a host, this value must explicitly set 0 on all the
	     advertising interfaces as described in rtadvd(8).	The default value is 1800.

     rtime   (num) Reachable time field (unit: milliseconds).  The default value is 0, which
	     means unspecified by this router.

     retrans
	     (num) Retrans Timer field (unit: milliseconds).  The default value is 0, which means
	     unspecified by this router.

     The following items are for ICMPv6 prefix information option, which will be attached to
     router advertisement header.  These items can be omitted, then rtadvd will automatically get
     appropriate prefixes from the kernel's routing table, and advertise the prefixes with the
     default parameters.

     clockskew
	     (num) Time skew to adjust link propagation delays and clock skews betwen routers on
	     the link (unit: seconds).	This value is used in consistency check for locally-con-
	     figured and advertised prefix lifetimes, and has its meaning when the local router
	     configures a prefix on the link with a lifetime that decrements in real time.  If
	     the value is 0, it means the consistency check will be skipped for such prefixes.
	     The default value is 0.

     addrs   (num) Number of prefixes.	Its default is 0, so it must explicitly be set to positve
	     values if you want to specify any prefix information option.  If its value is 0,
	     rtadvd(8) looks up the system routing table and advertise the prefixes corresponding
	     to interface routes on the interface.  If its value is more than 1, you must specify
	     the index of the prefix for each item below.  Indices vary from 0 to N-1, where N is
	     the value of addrs.  Each index shall follow the name of each item, e.g.,
	     ``prefixlen2''.

     prefixlen
	     (num) Prefix length field.  The default value is 64.

     pinfoflags
	     (num) Flags field in prefix information option.  Bit 7 (0x80) means On-link flag
	     bit, and Bit 6 (0x40) means Autonomous address-configuration flag bit.  The default
	     value is 0xc0, i.e., both bits are set.

     addr    (str) The address filled into Prefix field.  Since ``:'' is used for termcap(5) file
	     format as well as IPv6 numeric address, the field MUST be quoted by doublequote
	     character.  This field cannot be omitted if the value of addrs is more than 0.

     vltime  (num) Valid lifetime field (unit: seconds).  The default value is 2592000 (30 days).

     vltimedecr
	     (bool) This item means the advertised valid lifetime will decrements in real time,
	     which is disabled by default.

     pltime  (num) Preferred lifetime field (unit: seconds).  The default value is 604800 (7
	     days).

     pltimedecr
	     (bool) This item means the advertised preferred lifetime will decrements in real
	     time, which is disabled by default.

     The following item is for ICMPv6 MTU option, which will be attached to router advertisement
     header.  This item can be omitted, then rtadvd will use the default value.

     mtu     (num or str) MTU (maximum transmission unit) field.  If 0 is specified, it means
	     that the option will not be included.  The default value is 0.  If the special
	     string ``auto'' is specified for this item, MTU option will be included and its
	     value will be set to the interface MTU automatically.

     The following item controls ICMPv6 source link-layer address option, which will be attached
     to router advertisement header.  As noted above, you can just omit the item, then rtadvd
     will use the default value.

     nolladdr
	     (bool) By default (if nolladdr is not specified), rtadvd(8) will try to get link-
	     layer address for the interface from the kernel, and attach that in source link-
	     layer address option.  If this capability exists, rtadvd(8) will not attach source
	     link-layer address option to router advertisement packets.

     The following item controls ICMPV6 home agent information option, which was defined with
     mobile IPv6 support.  It will be attached to router advertisement header just like other
     options do.

     hapref  (num) Specifies home agent preference.  If set to non-zero, hatime must be present
	     as well.

     hatime  (num) Specifies home agent lifetime.

     When mobile IPv6 support is turned on for rtadvd(8), advertisement interval option will be
     attached to router advertisement packet, by configuring maxinterval explicitly.

     The following items are for ICMPv6 route information option, which will be attached to
     router advertisement header.  These items are optional.

     routes  (num) Number of routes.  Its default is 0, so it must explicitly be set to positve
	     values if you want to specify any route information option.  If its value is 0, no
	     route information is sent.  If its value is more than 1, you must specify the index
	     of the routes for each item below.  Indices vary from 0 to N-1, where N is the value
	     of routes. Each index shall follow the name of each item, e.g., ``rtrplen2''.

     rtrplen
	     (num) Prefix length field in route information option.  The default value is 64.

     rtrflags
	     (num) Flags field in route information option.  Bit 4 (0x10) and and Bit 3 (0x08)
	     are used to encode router preference for the route.  The default value is 0x00, i.e.
	     medium router preference.

     rtrprefix
	     (str) The prefix filled into the Prefix field of route information option.  Since
	     ``:'' is used for termcap(5) file format as well as IPv6 numeric address, the field
	     MUST be quoted by doublequote character.  This field cannot be omitted if the value
	     of addrs is more than 0.

     rtrltime
	     (num) route lifetime field in route information option.  (unit: seconds).	The
	     default value is 2592000 (30 days). (not specified in draft-draves-router-selec-
	     tion-01.txt now)
     You can also refer one line from another by using tc capability.  See termcap(5) for details
     on the capability.

EXAMPLES
     As presented above, all of the advertised parameters have default values defined in specifi-
     cations, and hence you usually do not have to set them by hand, unless you need special non-
     default values.  It can cause interoperability problem if you use an ill-configured parame-
     ter.

     To override a configuration parameter, you can specify the parameter alone.  With the fol-
     lowing configuration, rtadvd(8) overrides the router lifetime parameter for the ne0 inter-
     face.

     ne0:\
	     :rltime#0:

     The following example manually configures prefixes advertised from the ef0 interface.  The
     configuration must be used with the -s option to rtadvd(8).

     ef0:\
	     :addrs#1:addr="3ffe:501:ffff:1000::":prefixlen#64:

     The following example presents the default values in an explicit manner.  The configuration
     is provided just for reference purposes; YOU DO NOT NEED TO HAVE IT AT ALL.

     default:\
	     :chlim#64:raflags#0:rltime#1800:rtime#0:retrans#0:\
	     :pinfoflags#192:vltime#2592000:pltime#604800:mtu#0:
     ef0:\
	     :addrs#1:addr="3ffe:501:ffff:1000::":prefixlen#64:tc=default:

SEE ALSO
     termcap(5), rtadvd(8), rtsol(8)

     Thomas Narten, Erik Nordmark and W. A. Simpson, ``Neighbor Discovery for IP version 6
     (IPv6)'', RFC 2461

     Richard Draves, ``Default Router Preferences and More-Specific Routes'', draft-ietf-ipngwg-
     router-selection-01.txt

HISTORY
     The rtadvd(8) and the configuration file rtadvd.conf first appeared in WIDE Hydrangea IPv6
     protocol stack kit.

BSD					   May 17, 1998 				      BSD
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