SSID Isolation for Guest Network (T3200M) - Chromecast

Won't affect the SSID isolation on the T3200 because the firmware is as it is.

It would however give you the possible option of having a physically separate router without needing to mess with settings on the T3200. If you have an ONT (the box that converts fibre to ethernet) you can essentially attach a gigabit switch to it. Have one ethernet cable from the switch connected to the WAN port on the T3200 and hook up a separate router's WAN or internet port directly to another port on the gigabit switch. Each router will have their own separate external IP address in that configuration. They will also be 100% separate and for the second router for guests, you can configure it however you want without any worry that they can access anything on the T3200 network. Just note if your office has Optik TV, the set top boxes will have to still be connected to the T3200.

This is essentially how I would configure my network in your situation. Gigabit switches, especially a basic 5 port one, are typically very cheap to buy. $20 or less if on sale. I have a number of gigabit switches in my network currently. Mostly 8 port but includes this 5 port gigabit switch which I have had no issues with so far.

🙂