The routers or computers you are using for this have to support forwarding traffic. With Linux this is pretty straight forward for other OSes I’m not sure how easy it is.
You can get around this by having tailscale installed on the default gateway (router) of each network. It might be quite a pain for OP to change routers at each location. On the plus side, OpenWRT has some other cool features like PXE booting.
MysteriousSophon21@lemmy.world 1 day ago
Yep, just enable subnet routes in your Tailscale admin console and check “advertise routes” on both servers - that’ll let all your devices use the Tailscale connection without needing the client installed on evrything.