I am trying to get the following config to work at home: Cable modem -> 8-port unmanaged switch -> 6 ethernet connections to ports within the house. One of these ports goes into a wireless router (Main floor) while the modem and switch are on a lower floor. I cannot get any port other than Port 2 to work at the same time (port 1 is the input feed from the cable modem). My challenge is that I cannot keep the wireless router downstairs as I will not get any signal strength on the floor above. What si the best possible way for me to get coverage other than using multiple WiFi Access points? I also think this config above is not secure since all the ports are not protected from the outside world. Is this a setting from my ISP or the cable modem or would this be a problem with any ISP?
Appreciate any thoughts