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Hello,
I had the problem that I got only 200kb/s from a windows machine through
an openvpn tunnel. But when I opened 4 connections I got 800 kb/s but
only 200kb/s with one connection. The problem was that the TCP Window on
the windows machine was to small and the ACKs were to slow, so that the
connection was around 200kb/s. I saw that also on ethereal when I looked
at the TCP connection. => [TCP WINDOW FULL]
I solved the issue on windows by setting these two registry entries:
# This enables TCP Window Scaling (DWORD)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Tcp1323Opts=1
# This makes the default TCP Window bigger (DWORD)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpWindowSize=65355
See also:
http://proj.sunet.se/E2E/tcptune.html
http://www.speedguide.net/read_articles.php?id=157
Sincerely,
Thomas
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