Add New Virtual Network Interface to RRAS

Question

In the past (W2k3), adding an interface to the OS would also cause that interface to be added to RRAS.  I have a server running RRAS and it has multiple VMs running in Hyper-V.  I want to add an isolated VM that has a single port available from the Internet to that VM.  I have added an Internal Virtual Network and configured it with a static IP (in the host OS) (same configuration (except IP address) as my other virtual network interfaces).  The new interface does not show up in RRAS even after restart.  In W2k3, you could add an interface in the Network Interfaces area.  In W2k8, the only interface you can add is a demand-dial interface.
In the past, I had to delete the RRAS server and reinstall it to see the new interface.  This is ugly as it removes, for an extended time, all of the mappings, filters, etc. that I have in place.
Any ideas on how to manually add a new interface to RRAS either by registry, powershell, script, etc.?Pete

Answer 1

I found a new way around this which should work for everyone, a twist on the existing registry solution:
Open RegEdit.exe.
Go to "HKLM\System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces" where each of your network adapters (physical or virtual) has a GUID named sub-key. Identify which one is your network adapter (look at the IP or DHCP settings in the child key=values
or configure a temporary address so you can find it). Now you have discovered the GUID. Click the GUID key then hit F2 to goto rename mode and highlight the whole key, hit CTRL+C to copy to the clipboard.
Go to "HKLM\System\CurrentControlSet\Services\RemoteAccess\Interfaces". Add a new sub-key which is the next in sequence, for example I had 1...6 so I added "7". This is key add the following...
A DWORD32 (32bit integer) called "Enabled" set to 1.
A REG_SZ (string) called "InterfaceName" then paste your interface GUID, e.g. set to "{XXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}".
A DWORD32 called "Stamp" set to 0.
A DWORD32 called "Type" set to 3 (LAN).
Restart RRAS, the interface will appear!
Right click each protocol, e.g. IPv4, IPv6 then you can right click "General" to add a "New Interface..." and your interface will then be enabled for that protocol.
I'm happy I played around a bit more to find that now. But MS even though we have a solution which does not require us to lose our configuration, please fix the source of this problem!
Key Artefacts