Dynex 4 port Hub

You are probably putting too much current through the hub. 1 USB port is good for 500mA, and since this splits 1 into 4, you're working with 125mA per device if you have 4 things connected. Find a powered hub instead.

You mentioned in your question that you had a router. If it is actually a modem, then yes, you need a router.
The reason that the Ethernet hub is not working is that your modem will only give out 1 IP address to one device on the hub. With a router, the router uses the 1 IP address and shares access to the internet via that 1 IP address.
Yes, you'll need a router instead of a hub.

I would all of them to the router given it has enough ports. hubs are rarely use any more most people switches these days. router to switch to devices(xbox,computer) switches handle internet traffic better

If your trying to use this to share an internet connection.. sorry to say but it's not going to happen. The hub that you purchased will not handle the DHCP settings that need to be processed to share an internet connection.

Best advice... go back to Best Buy and smack the agent that sold you this and get a router instead. :D That's what you're needing to share your connection.

It takes a router to allow multiple systems to connect to the internet.

Hi,

You need to connect a cable from your modem into an internet port on your router and than a cable from an ethernet port of a router into an ethernet port of your hub and than a cable from hub to the computer.

Modem --> Router --> Hub --> Computer

all you need is the longitus eterneth cable needed to connect to / from the Dynex 4 port Hub ethernet cable plus a host pc on Dynex 4 port ethernet hub, the host pc you need to specify that you are sharing the connection of internet connection through the eterneth, and ready
luck

If your hub has 4 or 5 connectors, connect one port to your router. This device will NOT work when connected to your cable modem, as the hub does not manage IP addresses like a router does. Hope this helps ... the remaining ports will feed internet, but not provide Internet addresses to a computer.

Try connecting the hub to another USB port. You may even connect this same device to another computer and check if that works. This will help isolate the issue better.

Here is a link to their Support site: http://support.xbox.com/support/en/us/nxe/default.aspx Select "Troubleshooting/Connection" errors page. On the LEFT, select "Network Help". That should put you in the area you need.