Internal Domain DNS and Exchange Email

I have built two server internal to our network.  One is a web server (Linux) and the other is an Exchange 2007 server.  Internally we have Active Directory setup with a domain called DOMAIN.COM.  We have been hosted by GoDaddy with out web and email for DOMAINSITENAME.COM  

We are moving our website and email to our internal servers.  Is it ideal to change the design of our internal domain to be DOMAINSITENAME rather than DOMAIN or should I keep the infrastructure the same and use our DNS server to redirect the domains?

I worked for the government in Australia for 2 years and they had there internal domain name COUNCIL (council.NAME.qld.gov.au).  So do we need to change it for best practices and have something like DOMAIN.DOMAINSITENAME.COM for our internal network?
the-mizAsked:
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WadskiIT DirectorCommented:
There is no reason to change it. Infact I would go further to suggest you are better off keeping them different to avoid confusion during incident resolution.

Just remember to put internal routes into your DNS servers for your websites and think of some way of monitoring their availability from External.
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the-mizAuthor Commented:
Okay, I'm glad I didn't have to change my entire internal network.  Do you have a walk-through procedure of changing from GoDaddy to an internal web and email host?  I plan to do it on a weekend of course avoiding live users and work hours.  Our email and website is critical to our business and know there will be a bit of down time due to DNS propagation.

Do I simply forward the domain to our IP address, and change the MX records at GoDaddy to point in the right direction?  What about PTR and A records?
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GovvyCommented:
Just set up a exchange accepted domain and recipient policy with the new domain name and all should work fine
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Darius GhassemCommented:
You should not change the name of the domain you should be fine.

With GoDaddy I would point to your external IP addresses that handle the email and web. If you are using the same IP address then make sure you setup port forwarding properly.
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the-mizAuthor Commented:
We have a Checkpoint firewall that controls the traffic that comes in.  I just want to make sure when it is all said and done, that mail is being received and sent and everyone can access our website.  I hate to come in Monday and have to change it back.
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Darius GhassemCommented:
Just make sure you have the records pointing to the external IP addresses at your office.

For faster access internally since you have two different domains if you don't already have a DNS zone called DOMAINSITENAME.COM then I would create this Primary zone on your local DNS server this will allow this server to resolve these names internally
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