Troubleshooting the Ethernet controller

If a problem occurs with the 10/100/1000 Mbps Ethernet controller, use the Ethernet diagnostic program on the Resource CD to diagnose the problem. For more information about this CD, see “Ethernet diagnostic tests” on page 70. For information about the Ethernet error codes and actions to take, see the documentation on the Resource CD.

Network connection problems

If the Ethernet controller cannot connect to the network, check the following conditions:

vMake sure that the cable is installed correctly.

The network cable must be securely attached at all connections. If the cable is attached but the problem remains, try a different cable.

If you set the Ethernet controller to operate at either 100 Mbps or 1000 Mbps, you must use Category 5 or higher cabling.

vDetermine whether the hub supports auto-negotiation. If it does not, try configuring the integrated Ethernet controller manually to match the speed and duplex mode of the hub.

vCheck the Ethernet controller LEDs on the rear of the server.

These LEDs indicate whether a problem exists with the connector, cable, or hub.

The Ethernet transmit/receive activity LED on the rear of the server is lit when the Ethernet controller sends or receives data over the Ethernet network. If the Ethernet transmit/receive activity LED is off, make sure that the hub and network are operating and that the correct device drivers are installed.

The Ethernet link status LED on the rear of the server is lit when the Ethernet controller receives a LINK pulse from the hub. If the LED is off, there might be a defective connector or cable or a problem with the hub.

vMake sure that you are using the correct device drivers, which are supplied with your server.

vCheck for operating-system-specific causes for the problem.

vMake sure that the device drivers on the client and server are using the same protocol.

vTest the Ethernet controller.

The way the Ethernet controller is tested depends on which operating system you are using (see the Ethernet controller device driver README files).

Chapter 3. Diagnostics 75

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IBM 8688 manual Troubleshooting the Ethernet controller, Network connection problems