Microsoft announces Zero Trust DNS private preview

To support Zero Trust deployments trying to lock down devices to only access approved network destinations, we are announcing the development of Zero Trust DNS (ZTDNS) in a future version of Windows. ZTDNS was designed to be interoperable by using network protocols from open standards to satisfy Zero Trust requirements such as those found in OMB M-22-09 and NIST SP 800-207. ZTDNS will be helpful to any administrator trying to use domain names as a strong identifier of network traffic.

ZTDNS integrates the Windows DNS client and the Windows Filtering Platform (WFP) to enable this domain-name-based lockdown. First, Windows is provisioned with a set of DoH or DoT capable Protective DNS servers; these are expected to only resolve allowed domain names. This provisioning may also contain a list of IP address subnets that should always be allowed (for endpoints without domain names), expected Protective DNS server certificate identities to properly validate the connection is to the expected server, or certificates to be used for client authentication.

↫ Tommy Jensen on the Microsoft blog

If you think I know nothing about programming – wait until you hear me talk about networking. I consider it to basically be arcane magic, and my knowledge doesn’t extend much beyond “plug in cable to make light blinky” and “unplug from power to fix light no blinky”. Network administrators are the real heroes in my eyes.

Anyway, what I do get from painfully reading this announcement over and over again until my eyes started bleeding is that ZTDNS will give network administrators more finegrained control over which DNS servers and domains are accessible, and perhaps more importantly, it will encrypt traffic between clients and the DNS server. I have no idea if this is unique, or if it even makes any sense to do so, but it seems like a good idea, especially for corporate and government networks.

I’m struggling here, y’all. Please help me out.


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