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I need to do port forwarding on Windows 7.

I have machine A that runs a program, which connects to the internet. I need to debug this connection, and I can't install a sniffer for checking the packet transmission on this machine.

I want to connect A to another machine B. I would install a sniffer there, and use machine B to forward the packets to the internet.

This is why I need to install/enable a NAT server on B, which uses Windows 7.

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Port forwarding is usually done at a router between your computer and your Internet service provider. Can you describe your Internet connection setup, or at least explain why you need port forwarding? – William Jackson Nov 9 '11 at 16:41
    
I have program that need connect to WAN but it failed then I want check the packet transmit by sniffer I can't install sniffer on local machine my switch I havn't prmit run there sniffer – herzl shemuelian Nov 9 '11 at 16:45
    
If you can't install anything on machine A and you can on Machine B, there are options without any port forwarding. Here are some setups to capture traffic using wireshark: wiki.wireshark.org/CaptureSetup/Ethernet – MaQleod Nov 9 '11 at 17:37
    
you might find more help at: serverfault.com – Conrad.Dean Nov 9 '11 at 18:38
    
@Conrad.Dean It would be better not to ask these kinds of questions on Server Fault. It'd be off-topic there … or at least there's no reason to ask elsewhere when he can get help here as well. – slhck Nov 9 '11 at 18:48

The solution is to use tcpbridge.

I send the data from A to B, and on B I run the sniffer.

Then, I send the packets to the real destnation by using tcpbridge.

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