Nathan Thomas Sr said:
This may seem like an odd question, but keep in mind this is coming from a
DNS n00b.
What if your domain is not registered to your ip?
As long as that is a private domain it is irrelevant
(domain.local) etc.
If you are using a registerable name (e.g., domain.com)
then it is practically required that it be registered.
I find it rather confusing
to sign onto 'domain.com' when there really is no .com, just 'domain'.
You should NOT have a single lable DNS domain name
(which I believe you have indicated you do not.)
EVERY domain has a (sinble lable) NetBIOS version of
the DNS (multi-label) domain name (unless perhaps you
have disabled NetBIOS early on).
All you are doing then is using the NetBIOS version (or
alias) for your domain, e.g., 'DOMAIN' for 'domain.com'.
You may if you prefer login as User:
(e-mail address removed) (the User Principal Name--UPN)*
(*This is the default format but it is possible, especially with
multi-domain forests that the UPN DNS suffix has been altered.)