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The optimization of RcvWindow and DefaultTTL along with other registry settings such as MaxMTU and MaxMSS can speed up TCPIP modem and 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 your 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 restart Windows for the change to take effect.

		DefaultRcvWindow	REG_SZ	"4288"
		DefaultTTL	REG_SZ	"128"

	HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP

Related Tweaks

• Optimize Internet Connection Speed (Windows 95/98/Me)

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.