Multiple IIS Site Port Forwarding

Hi guys
We have a Sharepoint site setup on a server that is accessed externally through port forwadring to 80 and 443 through NAT. We have setup another similar site on another server, as we will decommission the old server soon , but we need to be able to test this new server first before we decommission the old one. How do we setup port forwading through NAT to the new server when both use the same 80 and 443 traffic? Can we point traffic to DNS and let this handle the rqeuest so it can work out which request the server is too
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just create a new DNS entry and point this to the new server and later switch it to the existing one.
easiest way to do it is to use another static ip (if available) and map the 2 ports to the 2nd server's internal ip address.

for example

staticip1 80/443 -> ipofsharepointserver1
staticip2 80/443 -> ipofsharepointserver2

this way sharepointserver1 isn't affected and you can test sharepointserver2 at the same time.

if you have a single static ip address and want to leave sharepointserver1 active, i'd make the change afterhours, test what you need to and undo the change on the firewall when you're done with the testing

from staticip1 80/443 -> ipofsharepointserver1
to staticip1 80/443 -> ipofsharepointserver2

after all tests, when you feel confident sharepointserver2 is good to go, simply make the above change and you're golden

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Microsoft IIS Web Server

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