Combine two networks (one local and one remote) into one?

[sensewolf]

Hi,

is it possible to combine two networks (one of which is remote and one of which is local) into one network in a transparent way, i.e. that devices in one network do not realize that they are talking to devices on another network but think that all devices are on the same network?

I have two sites connected via a wireguard tunnel. On Site A I have a network 192.168.3.0/24 and on Site B I have a network 192.168.103.0/24. Devices on 192.168.3.0 can talk to devices on 192.168.103.0 fine. But they don't discover each other.

It would be good to make them believe that all of them are on 192.168.3.0 (or to actually have them all on 192.168.3.0, if that's possible).

Is there a way to do this?

Thanks!