Hyper-V VM’s cannot access Host resources, and vice-versa

hyper-vvirtual-machinesvirtualizationwindows-server-2008

I have several Hyper-V vm's running on this Win2008 R2 Server box, and up until a reboot of the host server, all the VM's were able to access shared folders on the host. Now, they can't even ping the host server.

From what I've seen, I need to setup an Internal only network through Virtual Network Manager in Hyper-V. I set this up, then tried to enable the Microsoft Virtual Network Switch Protocol option in this Internal Only NIC, but I get popups saying:

Your current selection will also disable the following features: Microsoft virtual network switch protocol

Which is absolutely stupid, considering the protocol is what I'm ticking the checkbox to Enable!

As of now, on the host, I have 2 NICs:
Physical – This NIC on the host machine does have the MVNS protocol enabled
Virtual Network Adapter – Created through Hyper-V Virtual Network Manager as an External type of network. Trying to enable MVNS on this NIC also produces the error above.

I've tried enabling Client for Microsoft Networks on the physical NIC for IPv6, but everytime I do that, all the VMs lose Internet connectivity and I cannot RDP into them.

Anything else I can try?

Best Answer

What you're saying doesn't really make sense. The "correct" way to setup networking with Hyper-V is to:

  • Connect the one Physical NIC to the MVNS only, nothing else, Hyper-V will configure this for you and there's no reason to mess with it.
  • Create a virtual NIC that's connected to one of the virtual switches (or virtual networks as the Hyper-V Manager calls them).

There are three types of Virtual Networks you can create:

  • External: connected to the Physical NIC, the Virtual NIC on the Host, and any VMs you assign to it.
  • Internal: connected to the Virual NIC on the Host and any VMs you assign it to.
  • Private: connected to any VMs you assign it to and nothing else.

The Virtual NIC will always have access to the Physical NIC when configure properly.

If you just want the VMs to have access to just the Hyper-V Host, you can use an Internal. You can also use an External Network and they will have access to the Physical NIC's network.

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