How to use DHCP name protection in dual stack network

Question

Hi,

we are using Windows DHCP server for a dual stack network. Name protection is configured and works well, except for one small thing:

The non-windows machines have only one DNS record either A or AAAA but not both.
If the machine registers first the A reocrd incl. the corresponding DHCID record, the AAAA record is refused with eventid 10025 from DHCP-Server "as there is probably an existing client with same FQDN already registered with DNS." (which obviously is the existing A record).

If it is the other way round, the A record fails with the same error message but event id 1340.

How can I get it done, that also non-windows machines can register both addresses?

Thank you in advance

Answer 1

Hello,

Please test the following method to see if it solves the problem:

Verify that DHCID records are generated correctly on non-Windows clients, and ensure that IPv4 and IPv6 DHCID records are consistent.

Adjust the dynamic update Settings for DNS zones to allow for a more relaxed update policy (subject to security risks).

Configure on a DHCP server to force the handling of DHCID on non-Windows clients, for example through policy or advanced Settings.

Contact the vendor of non-Windows devices to verify that their DHCP client implementation is RFC compliant, especially for DHCID processing in a dual-stack environment.

For some critical non-Windows devices, consider manually creating static A records and AAAA records on the DNS server to avoid registration issues caused by DHCP name protection.

I hope the information above is helpful.

Best regards

Zunhui

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