Initiating Incremental Zone Transfers
An incremental zone transfer (IXFR) is a process by which all incremental changes to a DNS database are replicated to the secondary DNS server. This saves bandwidth over AXFR replication changes because only the deltas, or changes made to the database since the last zone transfer, are replicated.
IXFR zone transfers are accomplished by referencing a serial number that is stored on the SOA of the DNS server that holds the primary zone. This number is incremented upon each change to a zone. If the server requesting the zone transfer has a serial number of 45, for example, and the primary zone server has a serial number of 55, only those changes made during the period of time between 45 and 55 will be incrementally ...
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