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The idea of virtualizing network functions is driven by recent advances in network-focused hardware. In 2012, several large telecommunication operators issued a call to action for Network Function Virtualization (NFV) ¹ . The underlying idea is that every network service currently delivered on proprietary, application specific hardware should be deliverable using virtual machines. This means that routers, firewalls, load balancers and other network devices run virtualized on commodity hardware. Consequently, ETSI is extending this idea to mobile networks. Here, parts of the core and the radio access network will be virtualized. The immediate advantage is that any Virtual Network Function (VNF) can now be deployed, re-deployed and undeployed in the same way as any traditional virtual machine. Thus, NFV will result in more dynamic and agile networks than seen heretofore. However, this will raise a number of …