I've used Zero Tier in the past but not associated with the project. Have you set up subnets on a Network before? If you have it's like that. It creates a sub

I've used Zero Tier in the past but not associated with the project. Have you set up subnets on a Network before? If you have it's like that. It creates a subnet any IP within the subnet range will route to your virtual network. It shows up as a Network device on your computer, as if you had another NIC. The ID is used to connect to the Network. It plays the role a domain would play when connecting to a VPN. You could set up an internal DNS server like you can do with other internal subnets but it's optional. When I used Zero Tier it didn't have a DNS layer so you'd have to do it yourself with Bind/a DNS server/something, not sure if it does now.