You do not need a kext for the ethernet card, at least i didn't install any kext for my ethernet. You need to go to system preferences, network, and double click on the ethernet. it should be activated after that
Everything is fine on my XPS 435 MT, with a brand new harddrive (Samsung 1.5 To) and a Gigabyte GTX470 VideoCard.
On the Ethernet side, I noticed that everything works fine - Fixed IP on System -> Preferences. Great results on local file sharing with my other computers (all are Apple devices) but... I can't reached internet via Safari, Chrome or Firefox ! even if I reboot my machine several times...
Is there anything to setup like firewall or something ? All ports are open on my internet router for its MAC Adress.
The weirdest thing is : after a long shutdown of maybe 2 hours, I can use internet at its best performances. But, after maybe 5 minutes, this goes down and low. And finely no internet !
Any advices ??