My current network is using the Steve Gibson "three dumb routers" approach to isolating all IoT objects from my "real" network. It works just fine but, as things stand, wired devices within the IoT network are not isolated from each other, so there's at least the potential for nefarious activities between devices within the network. I'd prefer that my TV isn't being hacked by my cameras - or vice versa. What I'd like to do now is to partition off each wired device into a separate isolated network with the possibility of only one device per network, similar in principle to AP isolation with WiFi. Each device will see the WAN interface and nothing else. It should also be scalable and not limited by the number of physical ports, as would be the case with VLANs, where I'd be limited to four - or three in the case of this venerable old workhorse. Since I have only three working LAN ports, I'm already up to four devices so am having to use a dumb switch outside of the router. The device I'm currently using is a WRT54GL running v1.28.7636 Toastman-IPT-ND ND VLAN-Std. So is this doable?