One of the shortcomings in Windows Server Core is the possibility to change the network order or bindings in an easy way. The only way to do it is through the registry key. After we received some feedback from our customers one of the Hyper-V team members decided to write a tool called NVSPBind. NVSPBind also has the ability to enable bindings, bind or unbind the Hyper-V network switch protocol from a NIC and repair bindings on a NIC.
Read more about this tool http://blogs.technet.com/jhoward/archive/2010/01/25/announcing-nvspbind.aspx#comments