How to Increase RWIN


Reliability of the TCP/IP network protocol is based on the following concept: TCP/IP sends a pack of data and then waits for the acknowledgment that it is received, followed by sending the next portion of data. RWIN is a TCP Receive Window that is the amount of data a computer can receive without sending an acknowledgment. Default value of RWIN in Windows XP is 17520 bytes; that is too small for DSL or cable Internet connection. Increasing RWIN may improve the network performance.

  • Log in an administrator account in Windows XP.

  • Click "Start" in the lower left part of the screen and then click "Run."

  • Type "regedit" and press "Enter" to open the registry editor.

  • Browse to "SYSTEM\CurrentControlSet\Services\Tcpip\Parameters" under HKEY_LOCAL_MACHINE" on the left panel of the registry editor.

  • Click "TcpWindowSize" and enter the new RMIN value.

  • Click "File" and "Exit" to close the registry editor. Restart the computer.

Tips & Warnings

  • The increase of RWIN is only relevant for Windows XP users, as Windows Vista changes RWIN dynamically.


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