Hyper-V Network Switch
Hyper-V is changing the way networking works if you compare it to Virtual Server. Today I was reconfiguring my Hyper-V server and suddenly I've lost my RDP connection. Why did I lost my connection to the server? Well I was reconfiguring the networking settings and I wanted to add a network adapter to all my existing Virtual Machines. I created a new network which I called the external network because it was bound to my physical network interface. The moment I clicked on apply the connection was lost. I had to connect my screen and keyboard again to find out what happened, after troubleshooting a bit I saw that my NIC configuration was changed from static to DHCP address.
Why is this happening because when you create a Virtual Network with your physical NIC the way the Parent Partition connects to the network is changed.
The parent partition is actually using a Virtual Nic witch is connected to the physical one through the Virtual Network switch. Ben Armstrong wrote an interesting post about how the networking component changed in Hyper-V
http://blogs.msdn.com/virtual_pc_guy/archive/2008/01/08/understanding-networking-with-hyper-v.aspx
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