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is it possible to replace all TCP/UDP IPs in "Windows-Firewall" (or somewhere else) ? If so, how ? For example:

If someone with the IP adresse: tries to connect to my web server or ftp application, I need windows to replace it with, and to lie to all my applications, as if it's the "" who's really making the connexion (but Windows should forward data to original IP).

I'm having hard time explaining this, but I'm sure you know what I mean. Please help.

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what about using a local proxy? you can set the local ip address to and have all your connections sent to your application using –  Hex Oct 29 '12 at 12:12
ohh ... what you are trying to do is to just hide the IP addresses of your clients to be not visible by someone else through your program. As @Hex, said create a proxy server will be a solution but actually do a research and you'll find many more solutions and if you are a programmer you can make your own program and as a hint create NAT like program –  memosdp Oct 29 '12 at 12:47

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