I have a Linux 2.6 box that uses ifplugd to bring up the network. While initialising, the logs say,
"Initialisation complete. Link beat not detected." and then it goes into releasing the present address and obtaining lease all over again.
My question therefore would be:
- What is link beat?
- What does it mean if a link beat is not detected?
- Why is this so critical? What determines if a link beat is present or not?