Warning – Multiple Default Gateways…

I have seen this warning many times when doing P2V migrations or doing manual V2V migrations from my Virtual Server 2005 environment to Hyper-V, so I decided to share my solution.  It is caused by having orphaned NIC settings within your registry.  This is most commonly reveals itself when you try to reapply an IP Address after a migration but can happen in real hardware if you pull one NIC card and insert another.  By trying to give the new NIC card the same IP as the old one you will receive this warning since the system thinks you have two NIC on the same gateway.  Even though you cannot see the old NIC graphically, all of its previous settings are still in the registry.  Due to the wonders of plug and play, the system is waiting for, someday, the old NIC to return.  You can simply say yes to this message if the old NIC is not there or will not return, but every time you open up your NIC settings you will be presented with this message.  More of an annoyance than anything else, but here is how to remove it.

*Do the following all before you configure the IP Address of your server.

1. Run Regedit

2. Click Edit and then Find

3. Enter the Previous IP Address of your server in the Find dialogue box

4. Delete out all GUID Keys in the following locations that include the IP Address you are searching for. (Keep hitting F3)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Tcpip\Parameters\Interfaces\{NIC DEVICE GUID}

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\Tcpip\Parameters\Interfaces\{NIC DEVICE GUID}

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\services\Tcpip\Parameters\Interfaces\{NIC DEVICE GUID}

 

 

If you fill in your IP Address information now, you should not get the multiple gateways error.  If you do, go back through the registry and search for the previous IP address again.

 

-Rob