Updating zone file in bind

The format of also-notify changed in BIND9.9 to that shown below. The also-notify statement is relevant only with master zones and defines one or more IP addresses, and optional port numbers, of servers that will be sent a NOTIFY when the master zone file is reloaded.

The receiving slave controls which port number and which addresses it will accept NOTIFY messages from using the allow-notify statement or the masters statement.

This statement may be used in a zone, view or global options clause. IP address(es) that are allowed to transfer (copy) the zone information from the server (master or slave for the zone).

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From BIND9.10 the statement also allows the use of a Diff Serv Differentiated Service Code Point (DSCP) number (range 0 - 95, where supported by the OS) to be used to identify the traffic classification.

The following example shows an IPv4 name server which will be sent NOTIFY on port 53 (default) and the second refers to a list of servers defined in a masters clause each of which will use port 2034: also-notify defines a list of IP address(es) (and optional port numbers) that will be sent a NOTIFY when a zone changes (or the specific zone if the statement is specified in a zone clause).

If a global notify statement is 'no' this statement may be used to override it for a specific zone and, conversely, if the global options contain a also-notify list, setting notify 'no' in the zone will override the global option.

This statement may be used in normal zone, view or a global options clause.

allow-notify applies to slave zones only and defines a match list, for example, IP address(es) that are allowed to NOTIFY this server and implicitly update the zone in addition to those hosts defined in the masters option for the zone.

The default behaviour is to allow zone updates only from the masters IP(s).

These IP(s)s are in addition to those listed in the NS records for the zone.

The also-notify in a zone is not cumulative with any global also-notify statements.

While this statement would normally be used in a zone of type 'master' there is nothing to prevent its use in a 'slave' zone - in which case the NOTIFY would be triggered following a zone transfer to the slave. Defines an alternative local IP address to be used for inbound zone transfers by the server if that defined by transfer-source (transfer-source-v6) fails and use-alt-transfer-source is enabled.

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