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Adding virtual network to Hyper-V
Finnaly, I have found a solution for my problem, and everything works now.
First, you have to create new network adapter (I’m using external). Then, you have to add Legacy network adapter to your virtual machine (machine must be turned off). Why?
This is because the Beta release of Hyper-V does not contain Integration Components that support Windows XP. The legacy network adapter is emulated, so it will work for any operating system (when Integration components are not available).
Now in computer lab at my college I have virtual network between virtual machines, ping works just fine… great!
Solution was found at TechNet Hyper-V forum.

