On Sun, 2021-12-26 at 14:16 -0500, Dave Mintz via FreeIPA-users wrote:
> Hello,
> I have been trying to set up FreeIPA on an internal CentOS 8 server. 
> I was successful in getting it running, I set up DNS for internal
> queries.  It worked.  However, when I tried to set up SSL certs I ran
> into issue.
> 
> My question is this:  
> I own a legitimate domain.
> It is not “hosted”.
> I have no intention of exposing any of my internal servers to the
> Internet.
> How do I go about configuring the DNS at my registrar so that when I
> configure my internal servers, including FreeIPA, DNS, SSL, email,
> etc., any requests that go out to the Internet will resolve
> correctly?
> 
> Any help or pointers to documentation would be greatly appreciated.

I have freeIPA with DNS over several replication instances running. The
domains are like yours mostly internal and not to resolve externally.
Without a lot of boring details, you do not need to register your TLD
if you just use the domain internally. As long as the resolver your
internal hosts point to is your authoritative DNS server that FreeIPA
manages, the clients will get responses as they need.

This requires your server not to just blindly forward all DNS
externally. I have forward turned off on my domains. This means when a
client requests a public DNS address, the bind server managed by
FreeIPA will do a NS lookup to see where the request needs to be sent.
It's not 1.1.1.1 or similar services doing that. Works great for a
small network where your domain is 100% internal.

You can have an external NS too and they can provide very different
answers. Perhaps you just want MX to resolve externally but an ocean of
internal addresses should not. If someone outside your network tries to
resolve an address, they will hit the external resolver (not managed by
FreeIPA!) and only resolve what it knows about.


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