IP forwarding on the same host possible?
Hello ladies and gentlemen! I have an application running on a Windows 2008 R2 SP1 host which listens to the IP of the local hostname, let's say 10.0.0.10. I want to make a connection to this hosts from another application but I don't want to use the IP adress for security reasons. So I thought off adding a secondary IP to the NIC of my first Windows server, let's say it's 10.0.0.11. The second server's application should only use 10.0.0.11 for communication. Is it possible to "forward" all the traffic from 10.0.0.11 to 10.0.0.10? My application on the first node is configured to "listens" only on 10.0.0.10 and this cannot be changed. Thanks for your help. Best regards, Kalle
May 24th, 2012 6:04am

Forwarding between NICs on a machine is not necessary (and in fact is not usually possible). No matter what IP address you use to access the machine you use the same IP stack. Bill
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May 26th, 2012 1:33am

Hello Tiger, thanks for the reply. I only have one NIC in each Windows server. I cannot change the application (third-party). The application only excepts traffic from the IP address 10.0.0.10 in my example above. I can connect from the other Windows host to this address and everything is fine. However, for some special security reasons, I cannot open any firewall with address 10.0.0.10. So I thought, add a secondary address to my NIC, e.g. 10.0.0.11. Then I can establish a secure connection from my second Windows host to 10.0.0.11. But my application doesn't listen to 10.0.0.11! Is there a way to "forward" the traffic from 10.0.0.11 to 10.0.0.10? Thanks, Kalle
June 1st, 2012 1:09am

And here is the solution I found myself: netsh interface portproxy add v4tov4 listenport=12345 listenaddress=192.168.1.1 connectport=443 connectaddress=192.168.1.1 Best regards, Kalle
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June 20th, 2012 3:32am

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