How to share host VPN connection with VM instances in Hyper-V?

Question

I'm running my workstation on Server 2008 and a few servers in Hyper-V VM's on that server. I connect to my corporate LAN using VPN from the main OS (the host) but my VM's aren't seeing the servers in the corporate LAN. Internet and local access to my home network work fine. Each of the VMs has one virtual network adapter.

What should I try to make it work?

Maybe I need to provide more details, please ask if needed.

More details:

• cannot start multiple VPN connections
• not using NAT through the host
• VM gets IP address from the home network router (DHCP)

Answer 1

Setup some routes in your routing tablke. It really depends on how its setup but if you can access your corp network fine on the host, then setup the routes in your vm machines.

Also, as I am not familiar with that VM, are the network adapters like VMWares bridged adapaters? If so you need to setup the route to route to your host.

Answer 2

What type of VPN are you using? Ar you using the built-in windows VPN client, or do you have to install the client ?

You could just set up the VPN client independently on every VM, providing you are allowed multiple simultaneous connections.

I don't think that setting up routes would work because then you will also need to set up routes on your company network.

Answer 3

Let me make sure something clearer. You servers act as if they are physically seperated from your host. So with that in mind they need to be setup the same way as if they were seperated. That means that they need a route in their routing table. Why? Because right now their default route is to the internet via your gateway, NOT your host.

In short, approach the problem the way you would if they were not VM's and they were real servers on your network.

But as I aksed in my initial repsonse, Are they like VMWare bridged adapters. If they are what I say stands. If they are not, then thats a different story. FOr example, if they are setup in a NAT with your host, VPN should already work. Any other situation will require further investigation and more information.

Answer 4

Like I said you need to setup some routes. Add a route to your Corp LAN via your Host as the gateway. Just the fact alone you telling me that it gets it from home DHCPP tells me that is the issue. Your VM's only see 1 default gateway, and that is to the internet. The VM's have no idea whatsoever that the Host has a VPN on it. Adding that route (on VM machines) causes any requests that your VM's make to the subnet of your corp network to route through your host rather than the home router.

Adding something like this:

route ADD 10.0.0.0 MASK 255.0.0.0 192.168.1.30

on your VM'S would do this: Any requests made to the 10...* network would route through the computer with the IP address of 192.168.1.30. So replace the 10.0.0.0 and subnet with your corp lan, and the 192 ip with your hosts IP. That should take care of the issue.

Answer 5

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