TCP Settings for Mobile Broadband (HSDPA)
In order to hit the higher speeds using HSDPA, you need to ensure that Windows is configured optimally. Specifically, you need to ensure that your TCP settings are up to scratch. Here's a quick run down of the right settings to get you up to those higher data rates - these settings will be good up to 7.2Mbps You'll need to change the settings the in the registry.
If you don't know a. what the registry is, b. what TCP is or c. what the capital of Bhutan is, then this hack isn't for you. If in doubt, don't do it. Disclaimer over. So the keys you need to tinkle with are in:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
For all devices, or if you just want to change the settings for individual devices, they're held in:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
The optimal settings for high speed operation are:
| TCPWindowSize | 183960 Byte |
| GlobalMaxTcpWindowSize | 183960 Byte |
| Tcp1323Opts | 1 |
| SackOpts | 1 |
| DefaultTTL | 128 |
This only applies to Windows 2000 and XP - Windows Vista is apparently smart enough to change it's TCP settings on the fly. Enjoy.
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Comments
JoseLeon (not verified) commented on Tue, 2007-11-20 22:02:
There is a new version in Vodafone German website:
http://www.vodafone.de/hilfe-support/technischer-support/97001.html#rights
I have translated this webpage with google, you only need to accept clicking on the button and you will be able to download it.
JoseLeon (not verified) commented on Wed, 2007-11-21 02:37:
Sorry, I posted in the wrong section.
John (not verified) commented on Wed, 2008-03-26 06:59:
hi i cnt seem to find any of these values in my registry any help??
Great post :)
One question: these values are not by defect in Windows Xp registry, so we must add it manually. But what is the type of new value to create these settings?
Thanks.