1) https://www.broadcom.com/support/ethernet-nic-netxtreme-i-desktop-mobile

2)  http://www.dell.com/support/home/us/en/04/product-support/product/latitude-d830/drivers

http://www.dell.com/support/home/pl/pl/plbsd1/product-support/product/latitude-d830/drivers

http://www.notebookcheck.net/Dell-Latitude-D830.4290.0.html