rad.conf — router
advertisement daemon configuration file
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 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.
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.
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.
- /etc/rad.conf
- rad(8) configuration file.
- /etc/examples/rad.conf
- Example configuration file.
With the following example configuration,
rad(8) will pick a prefix from the
ix1 interface and send router advertisements on it:
interface ix1
The rad.conf file format first appeared in
OpenBSD 6.4.