17.3. No Link Light

If you do not have a link light on your network interfaces, they are not up and will not be able to communicate with the network. Your LAN and WAN interfaces both must have link lights.

If you do not have a link light on one of your network interfaces, there are a few potential causes and things to check.

If none of the above apply and you still are not getting a link light, verify functionality of both pieces of equipment by trying other devices. If you cannot get a link light on a network device no matter what you plug it into with any kind of cable, the device has a bad Ethernet port.


Note that some gigabit network cards do not properly support "Green" Ethernet standards and will never link on a "Green" switch. Changing to a non-green switch may fix this.