Using Hyper-V with different virtual subnets

Posted on 2010-09-01
Medium Priority
Last Modified: 2012-05-10
I'm a newbie on Hyper-V.
I have three virtual machines on a box with two NIC's. The VM's and host are all 2008R2.
They are set up as follows:
Host Hyper-Vmachine: NIC 1
Virtual DC1: NIC1
Virtual DC2: NIC1:

What I want to do is to set up the third virtual machine (Virtual DC3) in a different subnet (e.g., so that I can create a different site for AD testing.

Can I do that? If so,
(a) what address do I use for the second physical card?
(b) what address do I use for the Virtual DC3 virtual card?
(c) do I need to create another VM running ISA or Forefront?

Thanks in advance.
Question by:ovidbailey
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Accepted Solution

Darius Ghassem earned 2000 total points
ID: 33578667
Well the questions can be answered differently depending on your hardware please read over.



Now you can just use a physical network card to seperate as well.

Author Comment

ID: 33578704
Ok, let me look this over. Thanks for the speedy reply.

Author Comment

ID: 33583454
For now, I'm going to try it with just the second NIC; I added a router between that NIC and the other network.

But I think I have something fundamentally wrong (maybe an issue with multi-homing on my actual machine).
Physical network 1Gig: for the NIC and GW is
Everything works fine for the physical and virtual machines connected here.

Physical network 10/100: for the NIC and GW is
When I uninstall the NIC and bound virtual network, then reinstall and configure just the NIC, I can ping everything from the host machine.
But as soon as I add the Virtual Network bound to this NIC, I can ping the local address on the virtual and actual machines, but I can no longer ping the router/ gateway.

Gotta be missing something real obvious?
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LVL 59

Expert Comment

by:Darius Ghassem
ID: 33586123
From the host or the VM?

Author Comment

ID: 33586233
Neither, actually. Everything is OK on the real and virtual NIC1 (, but neither works on the network. For host and virtual, I can ping the local address (e.g., or, but can't ping the gateway for that host or VM (e,g,m
LVL 59

Expert Comment

by:Darius Ghassem
ID: 33586283
Well you should be able to add a NIC to a seperate subnet don't without issues. So, if you don't add the Virtual network you can ping the gateway?

Author Comment

ID: 33588778
Yes, that's correct.

Author Comment

ID: 33588804
Yeah, this didn't make sense to me either. Unless you have a real quick solution, I think I'll just set things up per your first post using the pure virtual LAN or connect to NIC1. I can forget about the second NIC for now and post a new question on that topic later if I don't get it figured out. Thanks for the help.

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