Tech Tips / Windows NT / Networking

Using DNS Manager, part 2

Zone transfers can create unnecessary network and server loads. In the DNS Manager, you can control how often these transfers take place. Keep in mind that a zone transfer is nothing more than a file copy procedure. The entire contents, not just changes to the DNS database, are copied from the primary to the secondary server every time the primary server notifies the secondary server that changes have occurred. You can control this notification by configuring the zone properties on the SOA Record tab.

The following values for zone transfer can be optimized:

  • Refresh Interval - this is how often the primary server should update the secondary server.
  • Retry Interval - this is how often the primary server will attempt to contact the secondary server if the first attempt fails.
  • Expire Time - this indicates how long the data will be considered valid if the secondary server cannot reach the primary server.

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