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I have a strange situation where connectivity (ie ping, access shared folders and services) is fine between virtual machines, but not between the host and the virtuals. I've been using Hyper-V almost every day for years and have never had a problem like this.

Note the following:

  1. The host machine and all virtuals are running Windows Server 2008 r1.
  2. All machines can connect to the web, and the gateway router.
  3. Subnet mask and gateway reported in ipconfig are identical for all machines.
  4. I can access virtuals via the Hyper-V snap-in only.

Doea anyone have suggestions about what might be wrong, or what diagnostic steps I can take?

enter image description here

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Please paste ipconfigs. How VMs are obtain ip addresses? Probably vms are behind the nat what makes them impossible to acces from top (host) network – infografik Mar 17 '12 at 10:21
Please post routing tables. – Eroen Mar 20 '12 at 7:58

What happens if you try to set on the VMs your host IP instead as the default gateway ?
(Instead of your gateway routers IP)

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I'll give it a try later, but if the VM can't ping the host, I doubt it will have any effect. – Greg Sansom Mar 20 '12 at 1:21

In the end bridging the virtual and real network solved the problem.

I have no idea how they became unbridged.

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