I have a spare AC68U and want to use it to allow wifi users to only access the internet. Can I connect the AC68U's WAN port to my LAN, set it's subnet to be different from my LAN's, and have the users only be able to access the Internet but have no access to my LAN? I guess I basically want those users to not be able to access anything on my LAN except for the LAN gateway. The AC68U will have it's own DHCP server for the wifi users but the WAN port's ip will come from the LAN's DHCP server.