It is used as a wireless ap. Its a replacement for an older dlink router/wifi ap (7100ap). The old model only had a single ethernet port and all I had to do was configure the ip address (LAN one) and the RADIUS secrets and it will work. Now with the new one, since the function is now separated, I am not sure which of the ports I connect to. I have set the LAN IP to the same ip as the old router, but I cant imagine it would need a connection to the WAN port just to talk to the radius server?