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Command: rad.conf | Section: 5 | Source: OpenBSD | File: rad.conf.5
RAD.CONF(5) FreeBSD File Formats Manual RAD.CONF(5)
NAME
rad.conf - router advertisement daemon configuration file
DESCRIPTION
The rad(8) daemon is an IPv6 router advertisement daemon.
The rad.conf config file is divided into the following main sections:
Macros
User-defined variables may be defined and used later, simplifying
the configuration file.
Global Configuration
Global settings for rad(8). These are used as default values for
interface definitions and can be overwritten in an interface block.
Interfaces
rad(8) sends IPv6 router advertisement messages. This section
defines on which interfaces to advertise prefix information and
their associated parameters.
Additional configuration files can be included with the include keyword.
MACROS
Macros can be defined that will later be expanded in context. Macro
names must start with a letter, digit, or underscore, and may contain any
of those characters. Macro names may not be reserved words (for example,
interface) Macros are not expanded inside quotes.
GLOBAL CONFIGURATION
The global configuration section sets defaults for router advertisement
messages. These can be overwritten in interface blocks.
default router (yes|no)
Act as a default router or not. The default is yes.
dns {option ...}
dns options are as follows:
lifetime seconds
The number of seconds the dns options are valid after
receiving a router advertisement message. The default is
1800 seconds.
nameserver (address|{address ...})
IPv6 address or list of IPv6 addresses of DNS name
servers.
search (domain|{domain ...})
Domain or list of domains for the resolv.conf(5) search
list.
hop limit hops
Specify the diameter of the internet. The default is 0, meaning
unspecified by this router.
managed address configuration (yes|no)
If set to yes, indicate that stateless address configuration
prefixes are not available and hosts should consult DHCPv6. The
default is no.
mtu bytes
The MTU option is used in Router Advertisement messages to ensure
that all nodes on a link use the same MTU value in those cases
where the link MTU is not well known. The default is 0, meaning
unspecified by this router.
nat64 prefix prefix [{option ...}]
Add a PREF64 router advertisement option to communicate prefixes
used for Network Address and Protocol Translation from IPv6 to
IPv4 (NAT64). If prefix is specified without a prefix length,
its default is 64.
nat64 prefix options are as follows:
lifetime seconds
The number of seconds the nat64 prefix option is valid
after receiving a router advertisement message. A value
of zero indicates to not use the prefix anymore. The
maximum is 65528 seconds. The default is 1800 seconds.
other configuration (yes|no)
If set to yes, hosts should consult DHCPv6 for additional
configuration like NTP servers or DNS name servers.
router lifetime seconds
The number of seconds this router is a valid default router after
receiving a router advertisement message. The default is 1800
seconds.
router preference (high|medium|low)
Indicate whether to prefer this router over other default
routers. The default is medium.
source link-layer address (yes|no)
Add a source link-layer address option to router advertisement
messages, to communicate the link-layer address of the sending
interface. The default is yes.
INTERFACES
A list of interfaces or interface groups to send advertisements on:
interface name [{prefix ...}]
Options set in the global section can be overwritten inside an
interface block. In addition an interface block can contain a
list of prefixes:
[no] auto prefix [{option ...}]
prefix prefix [{option ...}]
The default is to discover prefixes to announce by
inspecting the IPv6 addresses configured on an interface.
This can be disabled with no auto prefix. If prefix is
specified without a prefix length, its default is 64.
prefix options are as follows:
autonomous address-configuration (yes|no)
This prefix can be used to generate IPv6
addresses. The default is yes.
on-link (yes|no)
This prefix is considered on-link. The default
is yes.
preferred lifetime seconds
The preferred lifetime (pltime) in seconds for
addresses generated from this prefix. The
default is 2700. This option is ignored if the
prefix is discovered from a network interface and
it has a preferred lifetime configured.
valid lifetime seconds
The valid lifetime (vltime) in seconds for
addresses generated from this prefix. The
default is 5400. This option is ignored if the
prefix is discovered from a network interface and
it has a valid lifetime configured.
FILES
/etc/rad.conf rad(8) configuration file.
/etc/examples/rad.conf Example configuration file.
EXAMPLES
With the following example configuration, rad(8) will pick a prefix from
the ix1 interface and send router advertisements on it:
interface ix1
SEE ALSO
ractl(8), rad(8), rc.conf.local(8)
HISTORY
The rad.conf file format first appeared in OpenBSD 6.4.
FreeBSD 14.1-RELEASE-p8 December 28, 2024 FreeBSD 14.1-RELEASE-p8