bisogna anche poi impegnarsi un pochino e leggere... in merito alla LAN realtek a me pare sia l'unico presente li da RehabMan, poi leggendo:
Installation
Before you install the driver you have to remove any installed driver for RTL8111/8168.
Goto /S/L/E and delete the old driver (Lnx2mac, AppleRealtekRTL8169, etc.).
Recreate the kernel cache.
Open System Preferences and delete the corresponding network interface, e. g. en0. If you forget this step you might experience strange problems with certain Apple domains, iTunes and iCloud later.
Reboot.
Install the new driver and recreate the kernel cache.
Reboot
Open System Preferences again, select Network and check if the new network interface has been created automatically or create it manually now.
Configure the interface.