Policy
Configure Discovery of Designated Resolvers (DDR) protocol
Specifies if the DNS client would use the DDR protocol. The Discovery of Designated Resolvers (DDR) protocol allows Windows to move from unencrypted DNS to encrypted DNS when only the IP address of a resolver is known. If you enable this policy, the DNS client will use the DDR protocol. If you disable this policy setting, or if you do not configure this policy setting, the DNS client will use locally configured settings.
ad7076785940 DNS_Ddr Registry
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HKLM\Software\Policies\Microsoft\Windows NT\DNSClient\EnableDdr (enabled) = 1
HKLM\Software\Policies\Microsoft\Windows NT\DNSClient\EnableDdr (disabled) = 0 Policy notes
Specifies if the DNS client would use the DDR protocol. The Discovery of Designated Resolvers (DDR) protocol allows Windows to move from unencrypted DNS to encrypted DNS when only the IP address of a resolver is known. If you enable this policy, the DNS client will use the DDR protocol. If you disable this policy setting, or if you do not configure this policy setting, the DNS client will use locally configured settings.