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I would like to find out what ssthresh and cwnd has Windows computed for the connection.
For example on Linux I can do
ip route show cache
to see the computed values.
You can do that in Windows, but you have to program it yourself. Have a look at this: http://msdn.microsoft.com/en-us/library/windows/desktop/bb485738%28v=vs.85%29.aspx
The GetPerTcpConnectionEStats function (available since Vista) can get you all kinds of info, like cwnd, ssthresh, dupack’s, rtt’s, sack’s and much more about TCPv4 connections. Use GetPerTcp6ConnectionEStats for TCPv6.
Edit: The SDK has a utility that can show you this information. Here it is in c:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\tcpanalyzer.exe. I think it’s the Platform SDK from Microsoft ( http://www.microsoft.com/en-us/download/details.aspx?id=8279 ).