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Add the following entry in the file, the servers that are mentioned in the allow-transfer will able to transfer zones from master server.
This can be applied to all zones or particular zone.
If you do not have master dns setup on your environment, take a look at configuring DNS server on Cent OS 7.
Configure BIND on master server to allow zone transfer to secondary server, edit the /etc/file in primary.itzgeek.local.
It is very important when troubleshooting dynamic updates on Unix BIND or MS DNS Servers to have DNS logging enabled, esp.
to see the Update, Notify and Zonetransfer pakets in the logs.
The slave servers obtain zone data via a process called zone transfer (AXFR) or incremental zone transfer (IXFR).
(And I refuse to abstain from using the terms master/slave.) When we provision a master server with a new zone we must update all slave servers and inform them of the existence of this new zone and which addresses the master servers for the zone have.