I have a primary OpenWRT with a lan and a guest network.
In this configuration the guest network exists only attached to a guest SSID and routes to the wan network.
Now I'm adding a secondary OpenWRT as a wired Access Point.
I'm now wandering... is there a way to bring the guest network to the AP that does NOT involve setting up VLANs? Something like some form of OpenWRT to OpenWRT incapsulation?
If these APs are connected by ethernet (wired), the first answer would indeed be VLANs - it's the easiest and fastest approach.
If you can only connect wirelessly, VLANs are not an option. In that case, you need some kind of tunneling (think like wireguard), one approach for this would be GRE tunnels (you can do this wired or wireless). The various mesh approaches often also integrate their own VLAN replacements.
Yeah, in the end you where right. VLAN is the easiest way.
I ended up creating a 802.11q device on top of the right port and added it to the guest interface on both ends...