I have two Servers that need to replicate

[mkhjensen]

I have been using DNS for over 20 years to access database from on computer to another.
Now I got a new Frontier router and I see that the WAN IP is a local ip address like 192.168.4.35 and not the IP address that NOIP is giving. I search and found that I could setup ZeroTier.
I installed ZeroTier windows computer that has the database and I joined the network and I authorized it. Here is where I’m lost.

1. Do I still need NoIP DNS service?
2. I’m testing this on my computer connected to my route. I also need the computer with the database to be able to replicate to another computer, do I install the same Windows application on that on and enter the same network ID and added to the same Network in ZeroTier or do I need to create another network?
   Thanks for any help.

[erik]

If all three machines are connected to the same Zerotier network, you don’t need the NoIP DNS because you’ll know the zerotier address of the other machines and can always go directly to them, even if the ISP changes your public IP address (noting that if the Frontier router really has a 192.168.x.y as the WAN address, you’re in a double NAT situation so performance might not be great).

So in your case you want a single Zerotier network with all the computers on it. Then as far as they are concerned they all have a second network card connected to the same switch on a dedicated subnet.