Bind 9 Administrator Reference Manual

Chapter 6. BIND 9 Conﬁguration Reference

allow-update-forwarding

Speciﬁes which hosts are allowed to submit Dynamic DNS updates to slave zones to be forwarded

to the master. The default is { none; }, which means that no update forwarding will be

performed. To enable update forwarding, specify allow-update-forwarding { any; };.

Specifying values other than { none; } or { any; } is usually counterproductive, since the

responsibility for update access control should rest with the master server, not the slaves.

Note that enabling the update forwarding feature on a slave server may expose master servers

relying on insecure IP address based access control to attacks; see Section 7.3 for more details.

also-notify

Only meaningful if notify is active for this zone. The set of machines that will receive a DNS

NOTIFY message for this zone is made up of all the listed nameservers (other than the primary

master) for the zone plus any IP addresses speciﬁed with also-notify. A port may be speciﬁed with

each also-notify address to send the notify messages to a port other than the default of 53.

also-notify is not meaningful for stub zones. The default is the empty list.

check-names

This option was used in BIND 8 to restrict the character set of domain names in master ﬁles and/or

DNS responses received from the network. BIND 9 does not restrict the character set of domain

names and does not implement the check-names option.

database

Specify the type of database to be used for storing the zone data. The string following the database

keyword is interpreted as a list of whitespace-delimited words. The ﬁrst word identiﬁes the database

type, and any subsequent words are passed as arguments to the database to be interpreted in a way

speciﬁc to the database type.

The default is "rbt", BIND 9’s native in-memory red-black-tree database. This database does not

take arguments.

Other values are possible if additional database drivers have been linked into the server. Some

sample drivers are included with the distribution but none are linked in by default.

dialup

See the description of dialup in Section 6.2.14.1.