Virtual Interacting Network CommunIty (Vinci) is a software architecture that exploits virtualization to share in a secure way a private IT infrastructure among a set of users with distinct security levels and reliability requirements. To this purpose, Vinci decomposes users into communities, each consisting of a set of users, their applications, a set of services and of shared resources. Users with distinct privileges and applications with distinct trust levels belong to distinct communities. Each community is supported by a virtual network, or Virtual Community Network (VCN), i.e. a structured and highly parallel overlay that interconnects virtual machines (VMs), each built by instantiating one of a predefined set of VM templates. Some VMs of a virtual network run user applications, some protect shared resources, and some others control traffic among communities to discover malware or worms. Further VMs manage the infrastructure resources and configure the VMs at start-up. The adoption of several VM templates enables Vinci to minimize the complexity of each VM and increases the robustness of both the VMs and of the overall infrastructure. Moreover, the security policy that a VM applies depends upon the community a user belongs to.

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