I have an openWrt router successfully running for my home network. It includes a Guest network. To extend my wifi range, I connected a separate basic and cheap router as access point via ethernet.
(ethernet connected to ports, not WAN ports)
For my standard network this works fine, so all my devices end in the same network.
However, I would like to extend the guest network (or at least the functionality) to the separate router as well.
The seperate router cannot run openWRT, so I have not the capability to use a VLAN or something simmilar.
The guest account setting on the separate router is, if I understood correctly, also senseles, since I would separate my private lan as soon as I use the WAN port on the separate router.
The question is, would it be possible to do something like separating the network based on the mac adresses of the devices?
I think of some routing like: all known mac adresses connected to the separate router, are routed to the home network, all unknown mac adresses are separated and routed to internet only.
Another possiblity I'm thinking of is on the DHCP side: all known mac adresses will get an internal IP adress, all others get an IP adress from the guest network.
I'm not sure, if one of my ideas are principally working, and what is the security behind it (is a virus / malware on a guest device successfully separated if only the IP address range is different?)
Thank you for advises, maybe someone has an better idea?