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"IPNetTuner" is a simple control panel-like application that allows you to optimize TCP/IP network performance under Macintosh Open Transport by tuning internal TCP/IP parameters to match your network environment. The Tuner supports over 30 adjustable parameters including the TCP Window Size, Time Out intervals, Maximum Segment Size, and MTU.

You can save your settings in IPNetTuner settings documents and invoke them each time you start up by placing the corresponding document in your Startup Items folder.

Important: As currently implemented, IPNetTuner is best suited for configurations where TCP/IP is permanently loaded since there is no automatic way to remember custom settings when TCP/IP is unloaded

To keep TCP/IP permanently loaded, open your TCP/IP control panel, and click on the Options button (you must be in Advanced User Mode. Get into Advanced User mode from beneath the Edit menu of the TCP/IP control panel). Make sure the Load Only When Needed option is UNCHECKED. Save these settings by closing the TCP/IP control panel.

System requirements:

MacOS 7.5.3 and Open Transport 1.1.1 or later