Simple Route Needed for Typical home setup

Okay, so … first, you need a device that is in both networks, this could be your router at home IF it supports zerotier. Most default routers do not, so we need another device creating that connection. A raspberry pi for example, a NAS or other homeserver, all would probably do.

Since its the easiest and cheapest one, we will take a PI for this job.

What you need to is add the pi to zerotier. Then you need a route in zerotier, you can add that on the website, target would be your homenetwork/24 and the gateway would be the Zerotier IP of the pi.

That should do for the zerotier side.

Then we need to add a route on your home router, this one needs to route all traffic for the Zerotier network through the Homenetwork IP of your Pi.

Not all home routers support that. But there is an alternative if you can not set that. Its called NAT, and in this case it happens on Pi torwards your home network. It basically uses the PIs home IP address for all traffic from the zerotier network instead of the real zerotier client Ip of the device aka laptop or phone.

For that you should look up iptables MAQURADE and create a rule that does exacly that, since I am on my phone and the interface names are different most of the time I can not provide a full command here.

ADDITIONALLY, you need to allow forwarding on the Pi aswell. This is regardless if your router managed to do custom routes or not.

Usefull sources for commands and info are mostly found on guids „how to use Pi as router“ and „how to use pi as wlan accesspoint“. Also, I think I came across a video or blog post doing exactly what I just Described, if I manage to find one Tomorrow I will add that in [here]

I hope that gave you an direction and fundamentals of what you need to accomplish your goal.

PS. Bridging is NOT routing, there are zerotier guids for bridging but those merge the zerotier and physical network, what you want here is routing, and I strongly recommend routing over bridging for your usecase.

So you want to add the static route via the zerotier web gui. At the very top of your zerotier.com config add

Destination: 192.168.1.0/24 VIA 192.168.194.117

This tells your zerotier clients “hey if you want to talk to anything in the 192.168.1.0 network you need to go to 192.168.194.117 which is your zerotier service running on your network.