Dont go there.
They have 3G/4G on the phone and doesnt have to use your wifi.
Thereby having no control of the students. It doesnt have any effect.
Instead of shutting everything down, open it up and log the traffic. Much better using captive portal.
@hupernika0:
For the school, I want to blacklist everything and have a short whitelist so that students can't go surfing anywhere that hasn't been pre-approved.
For the guest wifi, the Pastor wants to just try out a guest wifi and see how it will work out, but he is justifiably afraid of it coming back and and biting him. So he'd like to start with the short whitelist.