rtadvd.conf - config file for router advertisement daemon
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 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 discovery 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 advertisements (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 advertisements (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 Managed address configuration flag bit,
and Bit 6
(0x40) means Other stateful configuration flag bit.
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.
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-configured 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
(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.
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.
You can also refer one line from another by using tc capability. See
termcap(5) for details on the capability.
As presented above, all of the advertised parameters have
default values
defined in specifications, 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 parameter.
To override a configuration parameter, you can specify the
parameter
alone. With the following configuration, rtadvd(8) overrides the router
lifetime parameter for the ne0 interface.
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="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="la":vltime#2592000:pltime#604800:mtu#0:
ef0: :addr="3ffe:501:ffff:1000::":prefixlen#64:tc=default:
termcap(5), rtadvd(8), rtsol(8)
Thomas Narten, Erik Nordmark and W. A. Simpson, ``Neighbor
Discovery for
IP version 6 (IPv6)'', RFC 2461
The rtadvd(8) and the configuration file rtadvd.conf first
appeared in
WIDE Hydrangea IPv6 protocol stack kit.
OpenBSD 3.6 May 17, 1998
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