If your Z is connected to your PC which in turn is connected to the Internet, you have to (for Windows):
1) Enable Internet Connection Sharing for your PC's internet connection - just select the Z Virtual Ethernet Adapter from the list.
2) Go into the Z's Virtual Ethernet Adapter settings on your PC and enter the following:
Subnet Mask: 255.255.255.0
and for DNS enter your router's ip adress to your PC (usually 192.168.1.1)
3) On your Z, go to usbd0 settings (Usb ethernet) and enter 192.168.0.2 for IP and the rest of the settings above for the rest. For DNS also use 192.168.1.1
If all goes well, you should be able to ping your PC (192.168.0.1) as well as, say, www.google.com.
works great.. and it still allows for syncing as well as ssh, scp, etc.. Thanks..