Problem Hardwiring 3 Devices to Router
I am having a very frustrating computer problem that has been going on for a few weeks, any help with this would be GREATLY appreciated! I am trying to hardwire a laptop, desktop computer, and an XBox to a D-Link router that is connected to my Shaw modem. First of all, I have called Shaw and they told me that I have unlimited IP addresses because I have Shaw Extreme-I internet, therefore this should not be the problem. They told me that my router is currently running two IP adresses, and I think the problem might be that it is not letting me run a third. I called the router company, and they told me that it was a problem with XBox. However, this is not the case because when I unplug either my desktop computer or my laptop, I am able to get internet access to my XBox. The problem is: I can get internet access to two devices through my router, but not a third. All the cords are working, the router and all ports work fine, I have internet access, I even called Dell to see if maybe a firewall was causing the problem, but this is not the case either. Each company that I call says that it is another company's problem, and no one seems to have any idea what is going on. I have done everything that everyone has said to try, and it is JUST NOT WORKING!
If anyone has any ideas why this might be, or what I may be able to do about it, please post here. I do not want to go wireless because I play an online RPG and wireless connections can be kind of sketchy - I prefer the stability of a hardwired connection.
Thanks in advance,