named.conf.4 (2010 09)

n
named.conf(4) named.conf(4)
(BIND 9.3)
Built-In Server Information Zone Options
The server provides some helpful diagnostic information through a number of built-in zones under the
pseudo-top-level-domain bind in the
CHAOS class. These zones are part of a built-in view of class CHAOS
which is separate from the default view of class
IN; therefore, any global server options such as allow-
query do not apply the these zones. If you feel the need to disable these zones, use the options below, or
hide the built-in CHAOS view by defining an explicit view of class
CHAOS that matches all clients.
hostname The host name the server should report via a query of the name
hostname.bind
with
type
TXT, class CHAOS. This defaults to the host name of the machine hosting the name
server as found by gethostname()
(see gethostname (2)). The primary purpose of such
queries is to identify which of a group of
anycast servers is actually answering your
queries. Specifying
hostname none; disables processing of the queries.
server-id The ID the server should report via a query of the name
ID.SERVER with type TXT,
class
CHAOS. The primary purpose of such queries is to identify which of a group of any-
cast servers is actually answering your queries. Specifying
server-id none; disables
processing of the queries. Specifying
server-id hostname;
causes named to use
the host name as found by
gethostname()
. The default server-id is none
.
version The version the server should report via a query of the name
version.bind with type
TXT and class CHAOS. The default is the real version number of this server. Specifying
version none disables processing of the queries.
Dual-Stack Server Option
Dual-stack servers are used as a last resort to workaround reachability problems due to the lack of sup-
port for either IPv4 or IPv6 on the host machine.
dual-stack-servers
Specifies host names or addresses of machines with access to both IPv4 and IPv6 tran-
sports. If a host name is used, the server must be able to resolve the name using only the
transport it has. If the machine is dual-stacked then the dual-stack-servers
have
no effect unless access to a transport has been disabled on the command line (for exam-
ple, with
named -4).
Empty Zone Options
By default, a reverse lookup query for an address in the following zone will not be
forwarded to the
root server for resolution.
D.F.IP6.ARPA
Please note that right now we have only one zone in this list. Additional zones may be added to
named at
later point of time.
By default, BIND is the authoritative server for the
empty-zones and returns NXDOMAIN for any
queries to addresses in these zones. This feature can be overridden by manually configuring named(1M)
to be authoritative for these zones.
disable-empty-zone
Disables an individual empty-zone. By default, none of the empty-zones are disabled.
If more than one empty-zone needs to be disabled, use this option multiple number of
times.
empty-contact
Specifies the contact name that must appear in the returned SOA record for empty zones.
If this option is not specified, then a period (.) is used.
empty-server
Specifies the server name that appears in the returned SOA record for empty zones. If
this option is not specified, then the zone name is used.
empty-zones-enable
Enables or disables all empty zones. By default, the empty-zones are enabled.
Forwarding Options
The forwarding facility can be used to create a large site-wide cache on a few servers, reducing traffic
over links to external name servers. It can also be used to allow queries by servers that do not have
direct access to the Internet, but wish to look up exterior names anyway. Forwarding occurs only on
those queries for which the server is not authoritative and does not have the answer in its cache.
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