Block internet access but not network access

I have a GL-X3000 and I want to block the internet access to a few of the IoT devices connected on it via Wi-Fi. Is it possible to do that?

I tried the “Block“ switch under the clients list, but that blocked the devices from the network completely.

Thanks

You should be able to. Please refer to my answer in reddit.

https://www.reddit.com/r/GlInet/s/GiTeHlBiF9