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NetBSD 6.1.5 - man page for rtadvd.conf (netbsd section 5)

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
	     (str or num) A 8-bit flags field in router advertisement message header.  This field
	     can be specified either as a case-sensitive string or as an integer.  A sting con-
	     sists of characters each of which corresponds to a particular flag bit(s).  An inte-
	     ger should be the logical OR of all enabled bits.	Bit 7 ('m' or 0x80) means Managed
	     address configuration flag bit, and Bit 6 ('o' or 0x40) means Other stateful config-
	     uration flag bit.	Bit 4 (0x10) and Bit 3 (0x08) are used to encode router prefer-
	     ence.  Bits 01 (or 'h') means high, 00 means medium, and 11 (or 'l') means low.
	     Bits 10 is reserved, and must not be specified.  There is no character to specify
	     the medium preference explicitly.	The default value of the entire flag is 0 (or a
	     null string,) which means no additional configuration methods, and the medium router
	     preference.

     rltime  (num) Router lifetime field (unit: seconds).  The value must be either zero or
	     between the value of maxinterval and 9000.  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.  Keywords other than clockskew can be augmented with a number, like
     ``prefix2'', to specify multiple prefixes.

     clockskew
	     (num) Time skew to adjust link propagation delays and clock skews between 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.

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

     pinfoflags
	     (str or num) A 8-bit flags field in prefix information option.  This field can be
	     specified either as a case-sensitive string or as an integer.  A sting consists of
	     characters each of which corresponds to a particular flag bit(s).	An integer should
	     be the logical OR of all enabled bits.  Bit 7 ('l' or 0x80) means On-link flag bit,
	     and Bit 6 ('a' or 0x40) means Autonomous address-configuration flag bit.  The
	     default value is "la" or 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.

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

     vltimedecr
	     (bool) This item means the advertised valid lifetime will decrement 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 decrement 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 items are for ICMPv6 route information option, which will be attached to
     router advertisement header.  These items are optional.  Each items can be augmented with
     number, like ``rtplen2'', to specify multiple routes.

     rtprefix
	     (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.

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

     rtflags
	     (str or num) A 8-bit flags field in route information option.  Currently only the
	     preference values are defined.  The notation is same as that of the raflags field.
	     Bit 4 (0x10) and Bit 3 (0x08) are used to encode the route preference for the route.
	     The default value is 0x00, i.e. medium preference.

     rtltime
	     (num) route lifetime field in route information option.  (unit: seconds).	Since the
	     specification does not define the default value of this item, the value for this
	     item should be specified by hand.	However, rtadvd allows this item to be unspeci-
	     fied, and uses the router lifetime as the default value in such a case, just for
	     compatibility with an old version of the program.

     In the above list, each keyword beginning with ``rt'' could be replaced with the one begin-
     ning with ``rtr'' for backward compatibility reason.  For example, rtrplen is accepted
     instead of rtplen.  However, keywords that start with ``rtr'' have basically been obsoleted,
     and should not be used any more.

     The following items are for ICMPv6 Recursive DNS Server Option and DNS Search List Option
     (RFC 6106), which will be attached to router advertisement header.  These items are
     optional.

     rdnss   (str) The IPv6 address of one or more recursive DNS servers.  The argument must be
	     inside double quotes.  Multiple DNS servers can be specified in a comma-separated
	     string.  If different lifetimes are needed for different servers, separate entries
	     can be given by using rdnss, rdnss0, rdnss1, rdnss2 ... options with corresponding
	     rdnssltime, rdnssltime0, rdnssltime1, rdnssltime2 ... entries.  Note that the maxi-
	     mum number of servers depends on the receiver side.  See also resolver(5) manual
	     page for resolver implementation in FreeBSD.

     rdnssltime
	     The lifetime of the rdnss DNS server entries.  The default value is 3/2 of the
	     interval time.

     dnssl   (str) One or more domain names in a comma-separated string.  These domain names will
	     be used when making DNS queries on a non-fully-qualified domain name.  If different
	     lifetimes are needed for different domains, separate entries can be given by using
	     dnssl, dnssl0, dnssl1, dnssl2 ... options with corresponding dnsslltime,
	     dnsslltime0, dnsslltime1, dnsslltime2 ... entries.  Note that the maximum number of
	     names depends on the receiver side.  See also resolver(5) manual page for resolver
	     implementation in FreeBSD.

     dnsslltime
	     The lifetime of the dnssl DNS search list entries.  The default value is 3/2 of the
	     interval time.

     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:\
	     :addr="2001:db8:ffff:1000::":prefixlen#64:

     The following example configures the wlan0 interface and adds two DNS servers and a DNS
     domain search options using the default option lifetime values.

     wlan0:\
	     :addr="2001:db8:ffff:1000::":prefixlen#64:\
	     :rdnss="2001:db8:ffff::10,2001:db8:ffff::2:43":\
	     :dnssl="example.com":

     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="la":vltime#2592000:pltime#604800:mtu#0:
     ef0:\
	     :addr="2001:db8: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'', RFC 4191

     J. Jeong, S. Park, L. Beloeil, S. Madanapalli ``IPv6 Router Advertisement Options for DNS
     Configuration'', RFC 6106

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

BSD					 December 7, 2012				      BSD


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