I had similar problems trying to get the (ever-in-progress) Arduino ethernet working. I could compile and upload code using the AVRlib enc28j60 library just fine, but it never seemed to respond to pings. Please post if you make any progress. 
I had similar problems trying to get the (ever-in-progress) Arduino ethernet working. I could compile and upload code using the AVRlib enc28j60 library just fine, but it never seemed to respond to pings. Please post if you make any progress.