You can use the Internet Connectivity Evaluation Tool to test if your router supports various technologies that have been integrated into Microsoft's Windows Vista operating system. The test itself seems to be working only on Windows XP or Windows Vista and requires Internet Explorer and Active X for the test.
The following features and technologies are tested when you run the Internet Connectivity Evaluation Tool: Basic Internet Connectivity, Network Address Translator Type, Traffic Congestion, TCP High Performance, UPnP Support and Multiple Simultaneous Connection State.
The test itself could very well take up to ten minutes, mine took about seven in total. Every phase of the test is explained to you so that you know what is being tested and how the technology is being used in Windows Vita.
Microsoft points out that the test should not affect the Internet connection which I can confirm. I have downloaded a large file while the test commenced and it was not affected in any way while the test was running.
My router passed all of the tests, what about yours ?
Update: The Internet Connectivity Evaluation Tool is no longer available on the Microsoft website. It appears to have been pulled from the site. What you can use instead is a program like Complete Internet Repair which tries to fix the Internet connection by repairing various Internet related services and applications in Windows. Please note that the program is not developed anymore, and that it is highly recommended to make a backup of the system before the program is run on it in case something goes wrong during usage.
You may alternatively try the network and Internet connection repair option. To do that, open the Network and Sharing Center, for instance by right-click the network icon in the system tray and selecting the option from there. Here you find an option to troubleshoot problems. Use it and follow the wizard to try the tool to restore your Internet connectivity.
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