If some of your computers do not have WiFi capabilities and you need to add more Ethernet ports, we recommend a high quality Ethernet switch.
If you order one of these, or the 8-port version, you can connect it to the main deco puck and NOT the modem. The modem has one port for a very specific reason...it is getting the internet signal to your router. Your router, the white pucks we installed, can then be connected to a switch.
Installing an Ethernet Switch