Is this a possible scenario? A cable modem is hooked up via ethernet to a Linksys 5-port switch. That switch is then hooked to a Cisco SOHO router (not managed by me) and my Linksys router. I cannot get my public IP to work on my router but the Cisco routers public ip comes up fine. I have all of the standard info plugged into my router but I am unable to get out to the internet.