Dns dynamically updating bind

By default BIND9 will send NOTIFY messages to all the target names (right-hand names) that appear in NS RRs for the zone (this behaviour can be modified by the notify statement.Note: The also-notify statement can appear in a zone file, in which case its scope is the single zone, or in an options clause, in which case its scope is all zones, or in a view clause, in which case it applies to all zones in the view.The allow-update in the first zone clause could have been omitted since it is the default behavior.Many people like to be cautious in case the default mode changes.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.

The also-notify in a zone is not cumulative with any global also-notify statements.allow-update defines an address_match_list of hosts that are allowed to submit dynamic updates for master zones, and thus this statement enables Dynamic DNS.The default in BIND 9 is to disallow updates from all hosts, that is, DDNS is disabled by default.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).

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