Hello dear gentlemen.

In continuation of a very old problem of mine, I'd really like to post here the solution.

MotherBoard Asrock N68C-GS FX, using MCP61 chipset and forcedeth driver, no link.

Create a file /etc/modprobe.d/forcedeth.conf
options forcedeth msi=0 msix=0
then reboot.

That's all folks!

*: Solution came from here.

If possible, dear mods, add this post to the end of my previous one.