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Optimizing the DefaultRcvWindow & DefaultTTL Settings

Posted On 2007-05-03 by FortyPoundHead
Keywords: Optimizing the DefaultRcvWindow & DefaultTTL Settings (Windows 9x)
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The optimization of RcvWindow and DefaultTTL along with other registry settings such as MaxMTU and MaxMSS can speed up TCP/IP modem networking connections (eg. Internet connections).
RWIN (Receive WINdow) is the buffer your machine waits to fill with data before attending to whatever other TCP transactions are occurring on the other threads and sockets WinSock has open while a connection is in progress.
The value of TTL (Time To Live) defines how long a packet can stay active before being discarded. The default value is '32'.
1. Open the registry and find the key below.
2. Create a new string value named 'DefaultRcvWindow' and set it to '4288'. If 'DefaultRcvWindow' already exists, then simply modify the current value.
3. Also create another string value named 'DefaultTTL' under the same key and set that to '128'. Again if it already exist, simply modify the value.
4. Exit the registry and reboot your PC.

Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP]
Value Name: DefaultRcvWindow, DefaultTTL
Data Type: REG_SZ


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