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Exchange 2010 - Adding to Exchange 2003 Organization - internal domain same as external

I am adding an Exchange 2010 Server to to an existing Exchange 2003  Organization and will co-exist for about a month.

My internal domain name theirdomainname.com is the same as the public or external domain name.  There are a lot of PCs in multiple cities in this domain, so changing the domain name (e.g. internal.theirdomainname.com) would be very much undesirable.

Does anyone see any problems with leaving this internal domain name "as is"?

I realize that I would need to get a multi-subject cert with theirdomainname.com, mail.theirdomainname.com and autodiscover.theirdomainname.com, etc.  and will need to set their internal DNS entries to point to their internal IP addresses.
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humphrey06
Asked:
humphrey06
2 Solutions
 
MaheshArchitectCommented:
1st of all you cannot rename AD domain having Exchange 2010

You can keep internal and external domain name space same

You need to use split DNS scenario for your environment. It  means whatever dns hostnames are there for exchange must be resolved with private IP within internal network and same host names need to be resolved from internet as well with public IP addresses

Your internal and external exchange URLs remains same and required only single public SSL certificate for all

Mahesh
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Will SzymkowskiSenior Solution ArchitectCommented:
This will work just fine for what you are doing. You can have a both variations setup and working. The big downfall if you have a lot of public DNS records is that you are going to have to manually manage both your internal zone domain.com and your external domain.com. As you have stated make sure that you have appropriate certs in place.

Take a look at the following link which explains in detail the benefits of both scenarios for management and security...

http://forums.msexchange.org/m_1800436336/mpage_1/key_/tm.htm


Will.
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humphrey06Author Commented:
Thanks for both of your prompt responses!
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