Originally I had a router that had four ethernet outs. One of these went to the AE, the other three were hooked up to devices (computers, ect.). I recently needed more ethernet connection so I purchased a 10 port gigabit switch. I have it set-up where the cable modem plugs into the switch and then from the switch I have my AE, computers, etcetera hooked up to it. The problem is if I hook a computer up first the AE doesn't work and gives the error "No DNS Servers." When I hook the AE up first the computer doesn't obtain an IP. What is wrong? Do I need to use a modem before the switch?