@mikee01 I assumed, perhaps incorrectly that you were going to use the GL-AR300M as a “dumb AP” and keep all your services running on the AR750. If that’s not the case, there are advantages to only running a single NAT, rather than “daisy chaining” the devices.
At a very high level, you would, on the AR300M
- Set up a management IP
- Disable DHCP, DNS, NAT, IP forwarding
- Bridge the wireless across all ports
This way the AR750 handles “everything” as far as services and routing goes.
If you set up the same SSID(s) on both devices, then your clients can “roam” freely between the two APs without needing to select the “other” SSID, and without the drops that might be caused by DHCP and routing changes if the two routers are using different subnets.
If you need additional help with this, please post again.