Mac OS X 10.0: Classic Does Not Allow Direct Hardware Networking Access

Applications open in the Classic environment of Mac OS X do not have direct access to networking hardware.
Symptom

Applications that directly access network hardware do not work in Classic. Examples include:

Such an application may report that it cannot find any ports.

Product affected

Solution

When the computer is started up from Mac OS X, you cannot use Mac OS 9 applications in the Classic environment for functions that require direct networking hardware access. Packet capture is one example of a task that requires direct or "raw" access to network hardware. Dial-up modem access is another. Alternatively, you may start up the computer from Mac OS 9.x to use such an application.

Open Transport, AppleTalk, and TCP/IP networking within Classic rely on the networking capability provided by Mac OS X. LocalTalk (AppleTalk over serial ports) does not work in Classic, nor does any software that depends on accessing the network directly through networking hardware. Dial-up access is passed through the Mac OS X application Internet Connect rather than originating within Classic.
Published Date: Feb 17, 2012