Exchange OWA UAG question running on VMware

Hello Experts,

I have a customer that is deploying a DR data center.  They are going to have OTV as an option to have to not change IP addresses when failing over VMs.
 
The network team has raised the point that failover the internal VMs and keeping the same IP is no problem but that could be tricky in regards to the DMZ.
 
Within the DMZ they are running Exchange OWA (UAG).  I can use SRM to fail over this VM and change the IP during the process.  If this IP changed how much, if any, manual changes would need to be made in order to get mail flowing?  Could Exchange be preconfigured to allow this to work no matter what the IP of the OWA server is using cost / prioritization etc.?   Have you ever had to deal with a scenario like this one?  

Can anybody provide your thoughts?
Jerry SeinfieldAsked:
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Jerry SeinfieldAuthor Commented:
Any updates?
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Jerry SeinfieldAuthor Commented:
please, provide your thoughts regarding my question, and the impact of Exchange OWA and UAG

Anyone else?
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Suliman Abu KharroubIT Consultant Commented:
DNS records are needed to be changed to point to the new IPs which needs more time to be done.

DNS Made Easy will help in this situation, check thier solution:
http://www.dnsmadeeasy.com/dns-fail-over-system-monitoring/
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Jerry SeinfieldAuthor Commented:
Can somebody from the Messaging team explain the service impact on Exchange OWA of changing IP address of your UAG/TMG/VM? steps to restore mailflow from the exchange/uag/tmg/vmware?

What would happen in the scenario above proposed?
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Jerry SeinfieldAuthor Commented:
Any updates?
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