What we do is uninstall the physical adapter and driver in the vm.
- Right-click the My Computer desktop icon and choose Properties.
- Click the Advanced tab and select Environment Variables.
- In the System variables section, click New.
- Set the Variable name to devmgr_show_nonpresent_devices and set the Variable value to 1 to enable the parameter.
- Click OK to add the variable to Windows.
- Start the Device Manager by running this command from the same command prompt:
start devmgmt.msc - Click View > Show Hidden Devices.
- Expand the Network Adapters tree (click the plus sign next to the Network adapters entry).
- Right-click the dimmed network adapter, then click Uninstall.
- Once all of the grayed out NICs are uninstalled, assign the IP address to the virtual NIC.
detail ref.: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1179