Question : Problem: Network card keeps blinking when inserting the network cable.

I have a problem with one of my new systems: The network card starts blinking a lot when inserting the network cable, and when booting up CentOS, I do not get any link through that card.

The weird thing is that this does not allways happen,  just for some combinations of network hardware.
* It works fine when attaching to my d-link router
* it works fine when attaching to one broadband modem (lyse.no)
* it fails when attaching to another broadband modem (lyse.no)
* It fails when using a crossed cable and attaching it to a d-link network card

Does anybody have an idea of what I can do to fix this problem?

Answer : Problem: Network card keeps blinking when inserting the network cable.

Hi there!
First thing coming to mind - disable auto negotiation on both sides.