atzanteol, (edited )

This is way overcomplicated.

Internet -> router/firewall -> your network with all devices

No DMZ needed or wanted.

You will want a dhcp server which will likely be the router/firewall. It will tell all your internal systems to use it as a “gateway” for Internet traffic. The router then allows outbound for everybody and does NAT - basically it makes requests on that systems behalf and sends the results back. If your want external access to a system you configure port-forwarding on the router (again it acts as the middleman between external and internal systems).

Edited to add: I love that you provided a diagram though! Makes it much easier to discuss.

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