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internal DNS for externally managed Route 53 on Windows Server 2016

cn flag
Jay

I'm trying to add a CNAME to a subdomain where the DNS for the domain is split. I'm using a CNAME because that's what the company hosting the site gave me. I've configured my external DNS with the 4 AWS name server records and it works fine. For my internal network, it's not resolving since it's a split DNS.

So I have an internal DNS zone domain.com with the following records.

www.domain.com A 192.168.1.2
external.domain.com Alias (CNAME) www.vendor.com.

In a browser, external.domain.com gives a DNS resolution error. www.vendor.com resolves.

If I ping external.domain.com from my internal network I get 172.67.xxx.xxx

If I ping www.vendor.com from my internal network I get 104.21.xxx.xxx

Turns out the vendor has registered www.vendor.com with Cloudflare and those IP are the two A records for the domain.

I tried adding external.domain.com as a new zone and then adding name servers for that zone but it appears I can only add by IP and not by hostname. I can resolve the IPs for the 4 Route 53 NS but I'm concerned those IP are not static.

Any idea what I need to do to make this work?

cn flag
Jay
I got the AWS hostname from the vendor and that worked but they cautioned that it's a load balancer and that could change at any time. I then tried adding my external DNS nameservers for the domain and that worked. One question, can I set the priority for internal DNS zone nameservers? I want it to hit internal DNS before it does a lookup on external.
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