named.conf.4 (2010 09)

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

(BIND 9.3)

Here’s a table of convenient values:

Seconds in an Integer Value

minimum 0 seconds

1 minute 60 seconds

1 hour 3600 seconds

1 day 86400 seconds

7 days 604800 seconds

30 days 2592000 seconds

24855 days 2147472000 seconds

maximum 2147483647 seconds

For convenience, some units can be explicitly speciﬁed; you can use

h for hours, m for minutes, and s for

seconds. For example,

1h30m.

Inverse Mapping in IPv4

Reverse name resolution (that is, translation from an IP address to a domain name) is achieved with the

in-addr.arpa domain and PTR records. Entries in the

in-addr.arpa domain are made in least-

to-most signiﬁcant order, reading left to right. This is the reverse of the way IP addresses are usually

written. Thus, a machine with an IP address of 10.1.2.3 would have a corresponding

in-addr.arpa

name of 3.2.1.10.in-addr.arpa

. This name should have a

PTR resource record whose data ﬁeld is

the domain name of the machine. If the machine has more than one name. it will need multiple

PTR

records. For example, for IP address 10.1.2.3, corresponding to host name

fred.example.com in

the

example.com domain:

$ORIGIN 2.1.10.in-addr.arpa

3 IN PTR fred.example.com.

Example

ISI.EDU. MX 10 VENERA.ISI.EDU.

MX 10 VAXA.ISI.EDU.

VENERA.ISI.EDU. A 128.9.0.32

A 10.1.0.52

VAXA.ISI.EDU. A 10.2.0.27

A 128.9.0.33

The

MX RRs have an rrdata section that consists of a 16-bit number followed by a domain name. The

address RRs use a standard IP address format to contain a 32-bit Internet address.

This example shows six RRs, with two RRs at each of three domain names.

AUTHOR

named.conf and the $GENERATE directive were developed by the Internet Systems Consortium (ISC).

Zone ﬁles were developed by the Internet Engineering Task Force (IETF).

FILES

/dev/random

/etc/named.conf Default named conﬁguration ﬁle.

/etc/resolv.conf

/etc/rndc.key

/usr/bin/named-bootconf.sh

Shell script to convert BIND 4.9.7 conﬁguration ﬁles to the BIND 9.3 for-

mat.

/var/run/named.pid