It’s a small bug, but this feature worked fine with the old Connect Box.
There are two places in the admin webpage that pertain to MAC filtering.
The first is under “Advanced Settings / Wireless / Security / Wireless MAC Filtering”. The text explains, wrongly, that this blocks devices from accessing the internet. According to other online documentation that’s not what it does. Instead, this option is to deny (or allow) MAC addresses to connect via wifi. This is probably just a documentation bug. (I’ve not tried this option, so maybe the function is broken too - I don’t know.)
The second, where the bug is, is under “Advanced Settings / Security / MAC Filtering”. The text explains, correctly (if it worked!) that it blocks MAC addresses from accessing the internet. This should impact any device, whether connected via wifi or ethernet. On the old Connect Box it worked as advertised. On my giga box, it actually blocks the device from accessing anything at all, even on the local LAN. This is a bug.
If I use the “IP and Port Filtering” option instead, that has the same bug. The workaround here is to add two entries, one blocking access to IP range 0.0.0.1 - 192.168.0.0 and one from 192.168.0.255 - 255.255.255.254.
I have a workaround (see above), but it’s messy and in my opinion blocks should be by MAC address not IP address.
Not urgent, and I’m sure there are other issues that take priority, but please add it on to the list 🙂