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troubleshooting Question

Forward multiple external ports to same internal port but different IP addresses

Avatar of sparky2156
sparky2156Flag for United Kingdom of Great Britain and Northern Ireland asked on
Windows NetworkingServer HardwareNetworking Protocols
7 Comments1 Solution864 ViewsLast Modified:
Hi,

Is it possible to forward multiple external ports to the same internal port but different internal IP address?

Example:
Lets say i run an internal IIS server for our company website, and use the NAT/PAT on the router to forward all external traffic on port 80 to this server. Then, lets say i set up an exchange server and want to set up OWA for users. This would require that i send port 80 traffic to a seperate location. Could i therefore continue forwarding all external port 80 traffic to port 80 on the IIS server, and set up a new port (lets say 6000) and instruct users to apply port 6000 at the end of the web address. I could then configure the router to forward all external traffic on port 6000 to port 80 on the exchange server?

Problem is, i have tried this, and i just get errors saying:

The port ranges overlapped: test (80-80) <--> HTTP (80-80

Thing is, i have tried this with different combinations of routers (bulk of which are belkin and netgear) and i get this kind of error everytime.

Is there something i should know about NAT/PAT in terms of translating external ports to the internal ports but different ip addresses?

Thanks.
ASKER CERTIFIED SOLUTION
Avatar of Peter Van den Broeck
Peter Van den BroeckFlag of Belgium imageICT manager

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