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Open Transport 2.6: Document and Software

This article has been archived and is no longer updated by Apple.

This article contains a software link to Open Transport 2.6 update.

Open Transport 2.6 addresses DHCP issues in Mac OS 9.0 and prevents Macintosh computers from being used in certain types of Denial of Service (DoS) issues.

Open Transport is the networking software in the Mac OS. This software installer updates Open Transport to version 2.6. This updater is for use only on computers using Mac OS 9.0, and PowerMacintosh G4, iBook, and iMac (Slot-loading) computers running Mac OS 8.6.


This updater will not work on other computers running Mac OS 8.6 or earlier versions of Mac OS.

This is only for Mac OS 8.6 if you have one of the three computers mentioned above. It is for all Mac OS 9 users.

Earlier versions of this software may be available at

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