Fixing IP address already assigned to another adapter error in VMware

Sometime, you could see below error when you need to modify or add IP address on existing network adapter of your VM.

According to VMware support this error can occur also if
- You have upgraded VMware virtual network adapters (for example, when you migrate a virtual machine from an older to a new version of VMware software).
- You have added and removed network adapters multiple times.
- You may see this if you recently performed a P2V and the resulting virtual machine still has the physical NICs and drivers for those NICs present. These ghost NICs have the old IP address and the virtual NIC cannot be assigned the same IP address.

This issue occurs if a network adapter with the same IP address is in the Windows registry but is hidden in the Device Manager (My Computer > Properties > Hardware > Device Manager). This hidden adapter is called a ghosted network adapter.
Using the Show hidden devices option in the Device Manager (View > Show hidden devices) does not always show the ghosted adapter to which that IP Address is assigned.
So how do we fix it? First make the ghosted network adapter visible in the Device Manager and uninstall the ghosted network adapter from the registry:

Click Start > Run.
Type cmd and press Enter.
At the command prompt, run this command:
set devmgr_show_nonpresent_devices=1

Note: If this command does not work (a possibility in Windows Server 2000 and 2003), you may need to add the parameter to Windows and set its value:

a. Right-click the My Computer desktop icon and choose Properties.
b. Click the Advanced tab and select Environment Variables.
c.  In the System variables section, click New.
d.  Set the Variable name to devmgr_show_nonpresent_devices and set the Variable value to 1 to enable the parameter.
e.  Click OK to add the variable to Windows.
4. Start the Device Manager by running this command from the same command prompt:
start devmgmt.msc
5. Click View > Show Hidden Devices.
6. Expand the Network Adapters tree (click the plus sign next to the Network adapters entry).
7. Right-click the dimmed network adapter, then click Uninstall.
8. Once all of the grayed out NICs are uninstalled, assign the IP address to the virtual NIC.

Well. I hope you have some fun with this post when you face with such kind of error with your VM.

Have a good time.
(Be knowledgeable, pass it on then)

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