Of Masters and Slaves
In the context of updates, what server to update becomes important, because there will be a need to know what server is the primary master. The primary master is named in the SOA record's first field. This field must not be used for the zone name. It must name the zone master server. Even if the server is otherwise unlisted, it must be named in the SOA record.
A slave server is a server that has a master. A master server is a server that acts as a master for a slave. The primary master is the zone origin server—it has no masters.
RFC 2136 specifies that, if a slave server receives an update request, the request shall be accepted and forwarded toward the primary master server. A slave server will not know who is authorized ...
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