said by worknman:There's no WAN port on this thing, so using my existing Asus RT-N56U hard-wired to it is not an option, I guess.
Because it has a built in router.. You could just hook your Asus up to one of the Ethernet ports on it and ensure it's not using the same NAT IP Address block and keep using the WiFi on the ASUS.. or disable DHCP on the ASUS and allow the Arris provide IP addresses to everything connected to the ASUS.