I am worried that there is not really a benefit of doing that, just more noise and energy consumption.
Here’s my use-case, I’m pretty sure the first 2 are pretty common (common enough to be supported by most OEM firmware):
- main LAN
- guest LAN (isolated from “main” but can access internet)
- IoT LAN (isolated from internet, can be accessed from “main”; prevents devices from phoning home)
But you don’t need several LANs for this. This can easily done with proper routing. A can access internet and internal network addresses. B can only access internet, and C can only reach internal addresses.
I’m curious. How would you identify who’s guest and who’s not in this case?
With multiple networks it’s pretty easy as they are on a different network.
That’s what MAC whitelists are for. Your DHCP server should be able to handle this.
Identify your friendly devices and give them one setting with everything (full subnet and correct default GW). Identfy your IoT devices, and give them another (full, or specially limited subnet mask, and fake default GW, maybe a different nameserver, too). Anything else is guest and gets a very limited subnet mask and a working default GW.
