DNS problem in combination with web domain & Windows domain

[johannes28]

I have a DNS problem combining our ISP hosted web presence and email server with our in-house Microsoft Windows domain (active directory, primary domain controller, backup domain controller)

Details
I recently have founded a company together with friends of mine. I will call the company SimSalaBim here, just to give it a name.
The company's web presence is hosted by an ISP. The same is true for our email server.
I.e.
web: www.simsalabim.com
POP3-server: e-mail.simsalabim.com
SMTP-server: smtp.simsalabim.com

We created an in-house Microsoft Windows domain named simsalabim.com. Reason for creating a domain is that we want to have central administration (user accounts, file shares, permissions, logon policies, participating PCs etc). This implied that the domain’s primary domain controller had to be made DNS server.
Problem now is that on PCs being part of the domain the name resolutions to the outside world are non-functional anymore. I.e. our web presence as well as the mail server are not reachable anymore.
The domain's DNS server does not know hot to resolve the DNS name to the correct IP address :-(
I tried to resolve this by creating exceptions (new Zone, new Delegation) in the DNS configuration on the PDC but without success.

Does anyone know if this setup is possible at all? – Or is the only resolution to re-create the domain with another name?

Any help would be highly appreciated!

Regards
Johannes

 

[Lord Gurke]

Does anyone know if this setup is possible at all? – Or is the only resolution to re-create the domain with another name?

I'm afraid this would be the only solution. Your client PCs have to resolve "simsalabim.com" to your local IP address of your PDC.
And your DNS server cannot determine which "simsalabim.com" is meant
You can try to add DNS records for "www.simsalabim.com" and the other subdomains manually to your local DNS server - but this is a really dirty way.

I think the best way is to set up your domain controllers with another name - like "simsalabim.lan" or something like that.
But I'm no windows server administrator, maybe someone has a better idea.