Check the physical and data link layers first.
- Is the network cable plugged in?
- Is it the right kind of Network cable?
- Host to Switch/Hub - Straight through cable
- Switch/Hub to Switch/Hub - Crossover cable
- Router to Switch/Hub - Straight through (routers actually are treated as hosts)
- Check the link light
- Is it on and solid green? With Ethernet, a solid green light usually means there is connectivity.
- Is the light blinking in a regular pattern of on-off-on-off? This means the network card is not able to communicate and there is a physical problem.
- Is the light on, but amber? On 10/100 Tx Ethernet cards an amber link light means the card is operating ant 10mbps. If the network is 100mbps, you won't be able to communicate.
- Check your Speed setting
- Ethernet networks of different speeds are not compatible.
- Find the lowest-speed device, reconfigure all devices to run at that speed.
- Verify all hubs and switches are the same speed as the network cards
- You may have to set the speed manually on the switch and the computer
- Check your duplex setting
- Devices with incorrect duplex settings will generate CRC and framing errors.
- You may have to set the duplex on the switch and the computer manually.
- Make sure you have the correct driver loaded and that the latest driver version is installed.
- The driver may have crashed, try rebooting the computer to correct the issue.
- If the wrong driver is loaded, you won't be able to connect to the network.
- Wrong version of the driver will cause auto-detection problems or other errors.
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