Enabling scavenging is not required for this to work. In our test lab, we did not enable scavenging in forward or reverse zone, but still, it worked immediately. To manage other stale records in DNS server, scavenging needs to be enabled.
This feature was first introduced in Windows Server R2. In this case, the first machine will no longer become accessible. In a secure only zone, this generally does not happen for Windows clients as those are protected using ACL. However, there is no ACL for non-windows systems so they can be overwritten easily by another entry.
When another client will try to register a record with the same FQDN, it will be prevented to do so, thus keeping the record intact for the first client. The scope level settings take precedence over the server level. Office Office Exchange Server. Not an IT pro? United States English. Post an article. Subscribe to Article RSS. Click Sign In to add the tip, solution, correction or comment that will help other users.
Report inappropriate content using these instructions. Another key area to maintain a healthy DNS database is to identify and delete stale records.
For zones that are either directory-integrated or use standard file-based storage, you can change the zone to enable all dynamic updates. This enables all updates to be accepted by passing the use of secure updates. The secure dynamic updates functionality can be compromised if the following conditions are true:. For more information, see the "Security considerations when you use the DnsUpdateProxy group" section.
The secure dynamic update functionality is supported only for Active Directory-integrated zones. If you configure a different zone type, change the zone type, and then integrate the zone before you secure it for DNS updates.
If you use secure dynamic updates in this configuration with Windows Server-based DNS servers, resource records may become stale.
In some circumstances, this scenario may cause problems. For example, if DHCP1 fails and a second backup DHCP server comes online, the backup server cannot update the client name because the server is not the owner of the name. In another example, assume that the DHCP server performs dynamic updates for legacy clients. If you upgrade those clients to a version supporting dynamic updates, the upgraded client cannot take ownership or update its DNS records.
To solve this problem, a built-in security group named DnsUpdateProxy is provided. If all DHCP servers are added to the DnsUpdateProxy group, the records of one server can be updated by another server if the first server fails. Also, all the objects that are created by the members of the DnsUpdateProxy group are not secured. Therefore, the first user who is not a member of the DnsUpdateProxy group and that modifies the set of records that is associated with a DNS name becomes its owner.
When legacy clients are upgraded, they can take ownership of their name records at the DNS server. If every DHCP server that registers resource records for legacy clients is a member of the DnsUpdateProxy group, many problems are eliminated.
If you are using multiple DHCP servers for fault tolerance and secure dynamic updates, add each server to the DnsUpdateProxy global security group. Also, objects that are created by the members of the DnsUpdateProxy group are not secure.
Therefore, you cannot use this group effectively in an Active Directory-integrated zone that enables only secure dynamic updates unless you take additional steps to enable records that are created by members of the group to be secured. To help protect against nonsecure records or to enable members of the DnsUpdateProxy group to register records in zones that enable only secured dynamic updates, follow these steps:.
A dedicated user account is a user account whose sole purpose is to supply DHCP servers with credentials for DNS dynamic update registrations. Assume that you have created a dedicated user account and configured DHCP servers with the account credentials. The dedicated user account should be created in the forest where the primary DNS server for the zone to be updated resides.
The dedicated user account can also be located in another forest. However, the forest that the account resides in must have a forest trust established with the forest that contains the primary DNS server for the zone to be updated. When the DHCP Server service is installed on a domain controller, you can configure the DHCP server by using the credentials of the dedicated user account to prevent the server from inheriting, and possibly misusing, the power of the domain controller.
When the DHCP Server service is installed on a domain controller, it inherits the security permissions of the domain controller. The service also has the authority to update or delete any DNS record that is registered in a secure Active Directory-integrated zone. This includes records that were securely registered by other Windows-based computers, and by domain controllers. The dynamic update functionality that is included in Windows follows RFC By default, the name that is used in the DNS registration is a concatenation of the computer name and the primary DNS suffix.
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I'm afraid that you're going to have to approach this from the client end. Changing the timeouts is only going to help clients the next time they check in, which is usually after half the existing lease time, or sometimes during boot.
You can approach this by manually forcing the clients to check in. If you insist on doing this from the server end of things, it should be possible to write a custom program to read the entries from a DHCP lease export, and register the addresses, but be sure to run it as the same account that DHCP uses for registrations, or else it may have trouble updating the entries in the future.
Note: Don't forget to change it back to a appropiate interval when the dns is updated and you must take another step in DHCP server for this to work. Note: Please backup your dns and dhcp before changing anything. But it has not been widely implemented in clients. You could disable and re-enable ports on your switch, if you have a suitable managed switch. Or, physically unplug and reconnect clients at your switch.
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