port forwarding

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I have

- Machine 1 running Windows, with DYNAMIC and PRIVATE IP address (behind a
- Machine 2 running Linux, with STATIC and PUBLIC IP address

How to setup port forwarding (port 81 on Machine 2 should be forwarded to
port 80 on Machine 1)?

I have little experience with SSH, so, please, suggest some software and a
few short steps on how to do this?

Many thanks,

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