Broadcom 570x Gigabit Integrated Controller

The Dell support site has a driver that one can use with the Broadcom 570x Gigabit Integrated Controller that was supplied on the board for the Latitude D600 laptop.

http://support.dell.com/support/topics/global.aspx/support/downloads/en/downloads_splash?c=us&l=en&s=gen&~mode=popup&file=176964