Open Transport 2.6 addresses DHCP issues in Mac OS 9, 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 Power Mac G4, iBook, and iMac (Slot-loading) computers running Mac OS 8.6.
Mac OS Classic