rad.conf —
router advertisement daemon configuration file
TABLE OF CONTENTS
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
{dns options}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 900 seconds.
nameserver
(IP|{ nameserver list })- IPv6 address or list of IPv6 addresses of DNS name servers.
search
(domain|{ domain list })- 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.
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.
A list of interfaces or interface groups to send advertisments on:
interface
name
[{ prefix list }
]
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
[{ prefix options }
]
prefix
prefix
[{ prefix options }
]
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 prefixlen, 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 604800.
valid
lifetime seconds- The valid lifetime (vltime) in seconds for addresses generated from this
prefix. The default is 2592000.
- /etc/rad.conf
- rad(8) configuration file
With the following example configuration,
rad.conf will
pick a prefix from the ix1 interface and send router advertisements on it:
interface ix1
ractl(8),
rad(8),
rc.conf.local(8)
The
rad.conf file format first appeared in
OpenBSD 6.4.
![[OpenBSD]](/openbsd.gif){kind=small}