Sharing Inteet connection to other devices through a router

I got a Raspberry pi which is connected to router's wan port. Another win7 computer is connected to the router's lan port. I tether my phone to raspberry and want to share its connection to the other devices.

I first tried it other way around (windows pc sharing the connection) using the instructions posted on here : Setting up wifi router as a switch for Inteet Connection Sharing

I followed those instructions except that I'm using the raspberry. I believe everything is correct so far, I just need to set up the equivalent for the tap in Windows 7 "Allow other network users to connect through this computer's Inteet connection."

How do I do that in Linux?

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