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A network interface may be using the wrong network connector on the adapter (many adapters work with more than one cable type). This can happen even if the adapter has been set to valid, non-conflicting settings and the driver is correctly configured to match these settings.
A common symptom of this problem occurs when the number of incoming broadcast frames is the same or less than the number of broadcast frames received, and the incoming/outgoing unicast frames are zero. This is especially common with EISA and Microchannel adapters because the value of the media option can only be set with their setup programs.
To ensure that the correct media connector is being used, verify the adapter's media option by running the hardware configuration. Sometimes, the LEDs on the back of the adapter or on a 10BaseT hub are useful. A network monitor or analyzer can also help verify that the adapter is generating traffic on the desired network media.
If your adapter can detect the correct media automatically, make sure the correct cable is connected to the adapter when the machine boots and that none of the other connectors on the adapter are being used. Ensuring that a single cable is connected to the right media is essential for automatic media detection to work correctly.
If an adapter set to automatically detect the correct media still does not operate correctly, try modifying the settings to the desired media instead of using automatic detection. For EISA and MCA adapters, this may require running the machine's setup program before rebooting your SCO OpenServer system.