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The NS records don't tell us which server is the primary master for a zone and which servers are slaves -- they only say who the servers are.

(Globally, DNS doesn't care; as far as the actual name resolution goes, slave servers are as good as primary master servers.) What's the difference between a primary master name server and a slave name server?

Without any notifies being received at all, named will periodically instigate a zone refresh for a slave - which means that it will send SOA queries to the servers in the list to see if it can find one that returns an SOA with a larger serial number than the one currently being served by the slave.

The servers are queried in turn - named moves on to the next server in the list if either: On the first SOA received that is bigger than the one than the slave is currently serving, then named will initial a zone transfer with that server.

On Unix-like operating systems it is the de facto standard.

Originally written by four graduate students at the Computer Systems Research Group at the University of California, Berkeley (UCB), the name originates as an acronym from Berkeley Internet Name Domain.

The term 'masters' here doesn't mean that the servers listed have to have the zone configured as 'master' - it just means that these servers so listed are authoritative for the zone and can provide a zone update if one is requested of them.

Slave servers can provide zone updates to other slaves.

The default behaviour is to allow zone transfers to any host.

This statement is mutually exclusive with update-policy and applies to master zones only.

The example shows DDNS for three zones: the first disables DDNS explicitly, the second uses an IP-based list, and the third references a key clause.

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.

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.