What are Legacy Resolvers

A Legacy Resolver is a UDP 53 based DNS resolver, and it's just an IP pair. If you're deploying Control D on a device that does not support Secure DNS protocols, you have to enable this feature. Once you do, you will be issued with 2 pairs of Legacy DNS resolvers: 2x IPv4 and 2x IPv6.

Example Devices

Here is a short list of operating systems and device types that require Legacy DNS resolvers

• Windows 10
• Most routers
• Android TV boxes
• Smart TVs

How to Use

Simply edit a Device and toggle the feature ON. Then view your resolver configuration to see your Legacy DNS IPs.

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Limitation

Legacy DNS resolvers require the source IP of the client to be known to Control D. See the next section to learn more on how that works, and how it can be automated. For troubleshooting, see this page.