Informations sur Plateforme Windows, virtualisation et administration des systèmes (Management, Virtualization & Windows Platform information)
Script: Creating an external-only virtual network with Hyper-V (one without a connection in the parent partition).
Merci Ben !!
http://blogs.msdn.com/virtual_pc_guy/archive/2009/02/19/script-creating-an-external-only-virtual-network-with-hyper-v.aspx
et pour aller plus loin