computer companies updating procedure - Microsoft dhcp not updating dns records

After the (Record Timestamp) (No-refresh interval) elapses we enter the Refresh interval.

All that is left is for somebody to come along, check all the timestamps and delete some stuff.

This is done by any server that hosts the AD integrated zone.

This timestamp will be replicated around and the No-refresh interval begins again.

If for some reason the client fails to update it’s record during the refresh interval it becomes One last thing before we leave the zone setting behind.

If the client has an existing host record and changes the IP of the host record this is also considered an “Update” and the timestamp is set.

If the client has an existing host record with the same IP address then this is considered a “Refresh” and the timestamp may or may not get changed depending on zone settings. The third way to set scavenging on records is by using with the /ageallrecords switch.

When you first set scavenging on a zone the timestamp seen at the bottom (reload zone if you don’t see it) will be set to the current time of day rounded down to the nearest hour plus the Refresh interval.

This also gets reset any time the zone is loaded or any time dynamic updates get enabled on the zone.

Recall from earlier that a refresh is a dynamic update where we are not changing the host/IP of a resource record, just touching the timestamp.

If a client changes the IP of a host record this is considered an “update” and is exempt from the No-refresh interval.

If you right click on your server you will see the option to “Set Aging/Scavenging for All Zones…”.

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