When checking the TCP state with the "netsh int tcp show global" command, it is also possible to see the following message below all those parameters: The two most important tweakable parameters are "Auto-Tuning Level" and "Congestion Control Provider". The settings, as well as their default and recommended state are explained below. You will be presented with something like the following: To check the current status of the Vista TCP/IP tweakable parameters, in elevated command prompt type the following command: Alternatively, you can navigate to Start > All Programs > Accessories > right-click Command Prompt and choose "Run as Administrator". To enter some of the commands below, you will need to run "elevated" command prompt. To do so, click the Start icon > Run > type: cmd , then click CTRL+SHIFT+ENTER. Still, there is always some room for improvement, and this article explains the known tweakable TCP/IP parameters. This, however, introduces some problems with older routers and restricts the user from tweaking some of the TCP/IP parameters. This new implementation works much better by default than previous Windows versions with broadband internet connections, and is able to adjust the RWIN value on the fly, depending on the BDP (bandwidth-delay product). Windows Vista introduces a number of new features to the TCP/IP stack, including CTCP, and TCP Window Auto-Tuning.
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