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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!To accomplish this, use the 80/20 rule, in which 80 percent of the IP addresses for one subnet are added to a scope on one DHCP server and the remaining 20 percent are added to a scope on another DHCP server.Because both servers have IP addresses available for the subnet, clients (or some of them) can still obtain an IP address should one of the servers become unavailable.Windows clients register dynamically why not Linux. I responded with "…like I said, Linux clients can dynamically register in DNS… SSSD allows the domain joined Linux clients to perform secure dynamic updates in DNS. It authenticates to AD just fine, but it does not dynamically register in DNS. " So we began to see if ALL the instructions were followed.There were ideas about DHCP performing DNS registration on behalf of the client, etc. I recommended that the person domain join their systems with SSSD and they would have their dynamic DNS solution. Linux secure dynamic DNS updates using SSSD are based on the understanding that the clients are securely authenticating as themselves (not a user).I responded with "Linux clients can dynamically register in DNS". Since they are securely communicating to Active Directory, SSSD expects to be performing an update to a DNS zone that is configure for Secure only updates.

Also, if your network consists of a number of mobile users who move between subnets, consider configuring a shorter lease time.

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.

When a client receives an IP address from a DHCP server, a renewal process occurs as the lease approaches expiration.

After 50% of the configured lease duration has elapsed, the client attempts to contact the DHCP server.

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