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Which server is considered to be the "Internet-facing server"?

Posted on 2014-01-02
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I'm installing 2 new physical servers from scratch. My main server will be Windows Server 2012 R2 Essentials with AD, DNS, DHCP and Anywhere Access enabled and configured. My second server will be my Exchange Server 2013 in Windows Server 2012 R2 Standard. I've read the MS TechNet articles on this setup which state that the CAS role should be installed on the "Internet facing" server. I'm not clear on weather I should install Exchange Server 2013 with the mailbox role and CAS role together on the same mail server or install CAS on my main server and only the mailbox role on the mail server. Please clarify.

Thanks.
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Question by:Adub65
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Cliff Galiher earned 500 total points
ID: 39752858
Installing any exchange roles on essentials is a bad idea. You'll either want to expose both servers to the internet by using multiple public IPs and appropriate routing rules, or alternatively a smart reverse proxy server to NAT and forward traffic based on URL.

Also, be aware that exchange 2013 currently cannot be installed on 2012 R2. Support is said to be coming in a future update.
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by:Adub65
ID: 39752884
OK, that answers a few things. MS did mention using a reverse proxy in the TechNet article and gave a link to install it. The article also gave step by step instructions on integrating Essentials with an on-site Exchange Server. I'll consider not using Server 2012 R2. And with that, I guess you're saying I should install both mailbox role and CAS role on the Exchange box?
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by:Cliff Galiher
ID: 39752890
Correct.
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by:Adub65
ID: 39753038
Thanks.
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by:Adub65
ID: 39773723
So I got my setup working with Essentials as my DC and a separate box running Exchange Server 2013. Integration of Essentials with Exchange Server works great. Mail flow works fine. My problem is accessing OWA externally from the internet. I set my Virtual Directories to use the same URL's and it works fine internally.

You mentioned using a smart reverse proxy. I installed ARR according to MS TechNet article (http://technet.microsoft.com/en-us/library/jj200172.aspx) Is there more information on configuring the reverse proxy? I'm guessing this has to be done in IIS with HTTP re-direct?

I have only 1 NIC and 1 public IP address from TW Cable.
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