From Windows Vista, we can set TCP window auto-tuning
disabled = scale factor 0
highlyrestricted = scale factor 2
restricted = scale factor 4
normal = scale factor 8
experimental = scale factor 14
However, it can be override by Windows if TCP heuristics is ON. To turn it off, go to registry
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\EnableWsd and set it to 0.
or run command
% netsh int tcp set heuristics disabled
See here: http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/5baff76a-be80-4e4d-a28e-e251dc5c5043
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