Google Fiber Router Recommended Setup

[catsdgs]

I have tried to set up KeexyBox on my Google Fiber router. I can see that there is no way to disable DHCP on the router. I tried to set up DNS only, but either my devices don't detect a captive portal or they do, but for a short time (like on Android). They can also access internet without any restrictions. Am I setting it up incorrectly? Any help would be appreciated. Thanks.

[catsdgs]

I have tried to set up KeexyBox on my Google Fiber router. I can see that there is no way to disable DHCP on the router. I tried to set up DNS only, but either my devices don't detect a captive portal or they do, but for a short time (like on Android). They can also access internet without any restrictions. Am I setting it up incorrectly? Any help would be appreciated. Thanks.