Dns records not updating 2016

Posted by / 21-Nov-2020 23:29

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.

If the zone is set to "Nonsecure and Secure" (allowing anonymous updates), every 15 minutes, the DNS record disappears. As seen in the verbose logs, every 15 minutes (the default), If the zone is nonsecure or set to "none " and the record does NOT exist, at step 3, DNS will create the DNS record (A(host) and PTR). **Note – Due to modern DNS client cache, the momentary delete / recreate of the DNS record is not noticed by clients.

The DNS server will then discard the authentication token as it is not needed (the record was registered… SSSD will get the expected returned response of a successful authenticated update. They will continue to resolve the LINUX host throughout the process.

The first is by someone coming in here, checking the “Delete this record when it becomes stale” checkbox and hitting apply.If you look in Microsoft DNS, you will see that the record is created.Upon close inspection of the security (Advanced view), you will see that the Linux host itself (as seen by its Kerberos principle name / computer object name), registered the record. NON-SECURE DYNAMIC UPDATE ZONES As discussed earlier, what happens if the DNS zones are configured for "None" or "Nonsecure and Secure"? In both scenarios, where we set the DNS zone to either None" or "Nonsecure and Secure", we will see a correctly formatted fully qualified name but then see a failure. DNS will delete the DNS record and discard the authentication token. This means until the NEXT cycle runs in 15 minutes, the client will be unresolvable (and cause great confusion every 15 minutes).What is even more confusing is the effect you see if the zone is set to "Nonsecure and Secure". This unexpected response to SSSD will generate an error. Hopefully this explains a number of scenarios and how to set to proper configuration.If the zone is set to "None", no update of any kind is done. To understand what happens here, you must look at the design of the DNS update process. Enjoy your more modern Linux dynamic DNS experience!

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'usmdua8006' is the single label name for the system. A hostname can be a single label name of a node on a network or it can be a fully qualified name (example: 'usmdua8006.contoso.corp') If you look in the screenshot above, you will see that the LINUX hostname is a single label name.

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