if you are using more than one computer (I am assuming this since you have a hub), your ISP will detect this and disallow internet connections. The hub is only a multiport-repeater. You need a router to run NAT so that the ISP will keep your cable connection open. It tricks the cable company into thinking you only have one computer. All they see is the router, not more than one computer. I know it's stupid, but we all have to deal with it.
