How Do I Cluster an Exchange 2010 and Exchange 2007 Hub transport  Server to share one Public IP?
I have an Exchange 2010 (MB,HT,CAS) Server and an Exchange 2007 (HT, CAS) Server. Currently client OWA requests are targeted directly to the Exchange 2010 CAS via https://mail.domain.com/owa or via https://192.168.0.10/owa. We want to cluster the two hub transport servers into one and NAT it out to a public IP. At the same time we want client OWA requests to be directed only to the Exchange 2010 server. How can we achieve this with minimal configuration. Thanks.
June 14th, 2012 2:07pm

Hi, You can't cluster an exchange 2007 server and an Exchange 2010 server. What is your exact goal. There might be other ways to get there. Leif
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June 14th, 2012 2:31pm

To have a common IP for each of the servers since I want to utilize both transport servers and then have a cname for both servers; thus I can NAT out that IP unto the internet. But at the same time direct all OWA request to the Exchange 2010 CAS. Thanks.
June 14th, 2012 2:34pm

Hi, You don't need any clustering for that (at least not in most companies). You just create a send connector on both HUB transport servers, allow TCP port 25 to the internet from both servers and you should have what you are looking for. No DNS record is needed for this Leif
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June 14th, 2012 3:27pm

As others have said, this isn't really clustering, and this isn't an Exchange question. Your solution is to configure your firewall with the correct rules. OWA\EAS\EWS\etc traffic should only goto Exchange 2010, this can be controlled via simple incoming firewall rule and DNS entry. Outgoing SMTP traffic can come from either 2007 or 2010, but you will need a NAT rule in your firewall so both servers show up as the same IP address on the Internet. There is nothing in Exchange to control this, you can use Send Connectors to control which servers can send to the Internet. Without a reverse NAT rule in place each server will show up as IP address(es) the firewall is configured to communicate with the Internet on.If this post helps to resolve your issue, please click the "Propose as Answer" If you find it helpful , mark it as helpful by clicking on "Vote as Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster. If you need an expert migration consultant to assist your organization feel free to contact me directly. Jason Sherry | Blog | Hire Me | Twitter: @JasonSherry Microsoft Infrastructure Architect, MCSE: M, MCTIP, Microsoft Exchange MVP
June 14th, 2012 5:19pm

Hi, Take the help of your firewall administrator.Configure your firewall rules to allow the port 25 from both transport servers. for receiving you do NAT (port 25 and 443) to your Exchange 2010 server..thats it.
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June 18th, 2012 6:02am

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