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Packet communications optimization tool

Overview

The "packet communications optimization tool" is a tool to optimize the settings of a PC, when packet communications are performed. In order to utilize the communication performance of packet communications to the maximum, it is necessary to set the communications with this software.

Function

The "packet communications optimization tool" sets the RWIN (receiving buffer size) value to the following optimal values.

64,240 au W series mobile phone
  • *A change of registry is not required for MTU, because each OS is automatically set to 1500 by default.
  • *Since the recommended values differ by the communication environments (ISDN/ADSL, etc.) except for au packet communications, it is necessary for the customer to change the value as required.

Operating environment

OS Windows® 98
Windows® 98 Second Edition
Windows® Me
Windows® 2000
Windows® XP
  • *However, only supported by Japanese OS.
Hard Disk Capacity 10MB or more
  • *This may change depending on the environment.

How to apply

Notes

  • This tool is not required for Windows Vista®.
  • Packet communications can be performed without this tool however, the packet communications performance may not be demonstrated sufficiently.
  • This tool is supported by Windows® 98, Windows® 98 Second Edition, Windows® Me, Windows® 2000 and Windows® XP, and will not operate in Windows® 95 and Windows® NT.
  • This tool is for changing the RWIN value only. The MTU value will not be changed.
  • When the RWIN value is changed with this tool, the RWIN value will be applied to all TCP/IP communications except Windows® XP. Whether to apply the value to all TCP/IP communications, or set the value by connection, can be selected in Windows® XP.
  • The set value will remain as is, even if this tool is uninstalled after the RWIN value is changed.
  • This tool should be installed by users with administrator privileges, when using Windows® 2000 and Windows® XP.
    If a user without administrator privileges installs this tool, an error message will be displayed and the tool cannot be installed.
  • This tool should be executed by users with administrator privileges, when using Windows® 2000 and Windows® XP.
    If a user without administrator privileges executes this tool, an error message will be displayed and the tool cannot be executed.

MTU (IP Packet Size)

"MTU" is an abbreviation for "Max Transfer Unit," and is the parameter to determine the packet size which can be sent at once. If this value is set too low, an excessive number of packets are required to send the same size of data, and if set too high, the performance worsens when exchanging a large amount of fine detailed data.
The transfer of data can be performed smoothly, by setting the size of the MTU to the most suitable value according to the network environment being used.

RWIN (receiving buffer size)

"RWIN" is the abbreviation for "Receive Window Size," and is the parameter to determine the capacity (buffer) which temporarily accumulates the transmitted data in a personal computer.
The sender of the data will continue to transmit the data, until the RWIN buffer on the receiving side becomes full. When the RWIN buffer becomes full, the receiver of the data will notify the sender that the data reception is completed. If this value is set too low, the frequency of transmissions between the sender and receiver increases and the performance worsens, and if set too high, the communication conditions worsen and trouble will occur if the data could not be received normally.

Download

Click below to download the packet communications optimization tool.

Download