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Windows 7: Networking with 2 adaptors

05 Jun 2011   #1

Windows 7 Professional x64
Networking with 2 adaptors

I read that have a network adaptor just for the virtual XP was faster. I don't use XP Mode as such but I do use virtual XP PC as a sandbox. So I got a second network card but unlike XP, 7 doesn't seem to allow you to have the adaptor enabled but the local area network disabled. If I have the adaptor enabled, then Virtual PC setting can see the adaptor and I can use use it for VPC. But win7 also uses and then moans that both adaptors are on the same subnet and use the same gateway. If I disable the 2nd local area network that also disables the hardware and so VPC can't see it or use it.

How do you do this?

My System SpecsSystem Spec
05 Jun 2011   #2

Linux CENTOS 7 / various Windows OS'es and servers

Hi there
you need something like a "Virtual switch" - generally you will use a second LAN adapter for a different subnet etc.

These sorts of scenarious are used when you have a number of "Virtual Servers" running on a Host machine running a Hypervisor (Vmware's ESXi or Ms's Hyper-V).

These are "bare metal machines" with a really tiny skeletal Linux system in them so maximum resources can be given to the VM. These allow multiple LAN cards to be used for different sets of VM's on different subnets controlled by a Virtual switch.

I'M sure XP mode won't allow anything like this -- you'll in the first instance need to create SEPARATE Virtual Machines, and then have some good virtual networking software to run these with.

Start by reading this -- although I think its overkill for what you need to do it's good learning material.

What is Virtual Switch (VSwitch)? A Technology Definition From

My System SpecsSystem Spec
06 Jun 2011   #3

Windows 7 Professional x64

Thanks for the reply but I'm not sure you catch my drift.

What I want to do is have
1. Win 7 (prof x64) -> NIC 1 (and not NIC 1 + NIC 2)
2. Virtual XP -> NIC 2

I use VirtuaWin to have 2 desktops, one full screen XP, one full screen Win7. I'm trying to crank up the speed on the XP which is running a remote desktop via Citrix. I can give Virtual XP one NIC but I can't stop Win7 using both NICs. When I ran Virtual XP on XP I could just disable local area network 2 on main XP but leave the adaptor enabled. There doesn't seem a way to do that in Win7.

I've tried putting the NICs on 2 different subnets and setting the router to cover both. Win7 shows both NICs on my home network. The setup I've tried is:


If I make the gateway different then I get 2 networks but not otherwise. It seems like anything, IP or gateway on the same subnet joins the networks into 1. And how I connect to the gateway on the wrong IP is a problem unless the router can do something on VLANs (whatever they are). But even if I split the networks that doesn't help. I want to disable the 2nd network on Win7 while leaving the NIC enabled so that virtual XP can use it. Win7's only disable seems to turn off the NIC.

FYI Citrix performs some scan on of my PC sending unrevealed data back (even MS doesn't do that!). Hence the reason to run it in an XP sandbox. Even ignoring the privacy issue I have info on this work PC for other customers which I must protect against snooping, not that I think the Citrix is snooping but since I don't know what it looks at or what it sends back....
My System SpecsSystem Spec

06 Jun 2011   #4

Windows 7 Professional x64
Solved, mostly

I think I have the solution (from Dedicated networking for Virtual Machines - Virtual PC Guy's WebLog - Site Home - MSDN Blogs).

In win7 change adaptor properties and remove everything except Virtual PC Filter Driver on NIC2 (and one NIC1 untick Virtual PC Filter Driver so VPC only has NIC2). Win7 then has the NIC2 enabled but with no connectivity. Select NIC2 in the virtual PC settings. Virtual PC connects by default with DCHP so this gives it an IP address and default gateway. Is still somehow works out that my network is 192.168.0.x and that DCHP is on Not sure how it does that or how to make the virtual PC use a static IP. Still it seems to work to give one NIC to win7 and one to virtual XP.
My System SpecsSystem Spec

 Networking with 2 adaptors

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