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This seems unintuitive to many when they learn this for the first time, but it vastly simplifies the code/algorithm for handling refreshes on notify and also ensures, by using the same sequence of SOA checks each time, that the slaves will always converge their SOA serial numbers to the most up-to-date version.For assistance with problems and questions for which you have not been able to find an answer in our Knowledge Base, we recommend searching our community mailing list archives and/or posting your question there (you will need to register there first for your posts to be accepted).Directives tell the nameserver to perform tasks or apply special settings to the zone.Resource records define the parameters of the zone and assign identities to individual hosts.The following example shows a very basic zone file.

When configuring BIND, all times are specified in seconds.

it behaves exactly as if the zone refresh timer has expired.

A notify is deemed valid if the sender is one of the servers in the NS RRset for the zone, has been explicitly allowed using an 'allow-notify' clause, or is from an address listed in the masters' clause.

Each resource record can contain its own TTL value, which overrides this directive. The Cent OS project redistributes these original works (in their unmodified form) as a reference for Cent OS-5 because Cent OS-5 is built from publicly available, open source SRPMS.

Increasing this value allows remote nameservers to cache the zone information for a longer period of time, reducing the number of queries for the zone and lengthening the amount of time required to proliferate resource record changes. Next, two nameservers are listed as authoritative for the domain. The documentation is unmodified to be compliant with upstream distribution policy.

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