Can't share internet on a Mac Pro

I've got cable modem > wireless router with 1 ethernet port > ethernet port connected to my Mac Pro.
I'd like to share the internet port that's going into my Mac Pro with a Windows PC sitting right next to it. So the ethernet cable is going from the wireless router to the Mac Pro port 1, then another cable is going from the Mac Pro port 2. So I need help configuring it.
The Mac Pro is set to DHCP with manual address (192.168.2.20), subnet (255.255.255.0), router (192.168.2.1), DNS (192.168.2.1).
I went into System Prefs > Sharing > and enabled internet sharing to ethernet port 2.
So I think everything is right on the Mac's side. Please correct me if I'm wrong.
Now I need to configure the PC, and I can't get this right.
I went into Windows' TCP/IP properties. I have it set to:
Use the following IP address:
IP address: 192.168.2.21
Subnet: 255.255.255.0
Default gateway: 192.168.2.1
Use the following DNS server addresses:
Preferred: 192.168.2.1
Doesn't work.
What's going wrong? Any ideas? Some google advice I found tells me to try IP addresses like 10.0.0.1 on the PC side. So I tried that, but it doesn't work either. What IP address is the Mac expecting?
I also tried "obtain an IP address automatically" and Windows says "connected" but is not pulling down any web pages.
Help!

Try setting the DNS to:
208.67.222.222 or 208.67.220.220. Or if you know the true IP of your ISP's DNS servers, then use those. The ones here are simply free public IPs anyone can use for their DNS servers.

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