named.conf.4 (2010 09)

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named.conf(4) named.conf(4)

(BIND 9.3)

forward This option is useful only if the

forwarders list is not empty. The default value

first, causes the server to query the forwarders ﬁrst, and if that is unable to answer

the question, the server will then look for the answer itself. If

only is speciﬁed, the

server will only query the forwarders.

forwarders Speciﬁes the IP addresses to be used for forwarding. The default is the empty list (no for-

warding).

Forwarding can also be conﬁgured on a per-domain basis, allowing for the global forwarding options to be

overridden in a variety of ways. You can set a particular domain to use different forwarders, or have a

different

forward only or forward first

behavior, or not forward at all; see The Zone Statement

section.

Interface Options

The interfaces and ports that the server will answer queries from, may be speciﬁed using the

listen-

on option.

listen-on The server listens on all interfaces allowed by the address match list. If a port is not

speciﬁed, port 53 is used.

Multiple

listen-on statements are allowed. For example,

listen-on { 5.6.7.8; };

listen-on port 1234 { !1.2.3.4; 1.2/16; };

will enable the name server on port 53 for the IP address 5.6.7.8, and on port 1234 of an

address on the machine in net 1.2 that is not 1.2.3.4. If no

listen-on is speciﬁed, the

server will listen on port 53 on all interfaces.

listen-on-v6

Speciﬁes the ports on which the server will listen for incoming queries sent using IPv6.

The server does not bind a separate socket to each IPv6 interface address as it does for

IPv4. Instead, it always listens on the IPv6 wildcard address. Therefore, the only values

allowed for the address_match_list argument of the

listen-on-v6 statement are:

{any;} and {none;}.

Multiple

listen-on-v6 options can be used to listen on multiple ports:

listen-on-v6 port 53 { any; };

listen-on-v6 port 1234 { any; };

To make the server not to listen on any IPv6 address, use

listen-on-v6 { none; };

If no

listen-on-v6 statement is speciﬁed, the server will not listen on any IPv6

address.

Obsolete Option

allow-v6-synthesis

This option was introduced for the smooth transition from AAAA to A6 and from "nibble

labels" to binary labels. However, since both A6 and binary labels were then deprecated,

this option was also deprecated. It is now ignored with some warning messages.

Operating System Resource Limit Options

The server’s usage of many system resources can be limited. Scaled values are allowed when specifying

resource limits. For example,

1G can be used instead of 1073741824 to specify a limit of one gigabyte.

An unlimited size_spec requests unlimited use, or the maximum available amount. default uses the

limit that was in force when the server was started.

The following options set operating system resource limits for the name server process. A warning will be

issued if an unsupported limit is used.

coresize The maximum size of a core dump. The default is default.

datasize The maximum amount of data memory the server may use. The default is default.

This is a hard limit on server memory usage. If the server attempts to allocate memory

in excess of this limit, the allocation will fail, which may in turn leave the server unable

to perform DNS service. Therefore, this option is rarely useful as a way of limiting the

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