If you have multiple ports on your router:
Set it up like this:
Set different OWA URLS for each environment. Let’s say SBS Exchange 2003 server has OWA = owa.Sourcedomain.com and Exchange 2013 server has OWA = webmail.Destinationdomain.com
- The first router port would be configured with IP address 1, and accept inbound/outbound mail traffic for http://owa.Sourcedomain.com:443/owa
- The second router port would be configured with IP address 2, and accept inbound/outbound mail traffic on http://webmail.Destinationdomain.com:443/owa
If you have just one port on your router, as is the case with some small companies, then you’ll need to either set up port translation and port redirection to handle the traffic routing.
For example, you could add, say, port 4443 to accept traffic for webmail.Destinationdomain.com and leave port 443 to accept traffic for owa.Sourcedomain.com.
- Port translation would need to be configured on the router so that incoming traffic on port 4443 would then be translated to port 443.
- Port redirection would need to be configured on the router so that after translation this traffic would then be redirected (using port redirection) to the new (Destination) Exchange 2013 server.
- For traffic coming into port 443 there is no port translation. It is just redirected to the old Exchange 2003 (Source) server.