NAT needed as only 1 Public IP, but not fully working

Ok, I have only just started with Proxmox (so please go gentle) and I am trying to set it up on a Hertzner Dedicated sever which just comes with 1 IP (144.76.xx.xx). I am looking to host all my VMs on a NAT network , the idea being that they will be able to access the internet and via limited port forwarding they would be accessible from the internet but only via certain ports.

i have spent days looking such a scenario up on various internet website, and as a result my...

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