Resource extension techniques in enterprise architectures through cloud connectivity

An enterprise that uses a private addressing scheme can connect to an Infrastructure as a Service (IaaS) cloud to enhance its server capacity for a limited period. The IaaS cloud service provider partitions a portion of its public cloud to realize a private cloud for the enterprise. The private cloud is reachable as an extension to the servers of a business computing environment through an appropriate communication medium. A secure Virtual Private Network (VPN) tunnel is established between the enterprise datacenter and the public cloud. The three major existing approaches in building IaaS systems are Layer 3 (L3), Layer 2 (L2) and network virtualization. Among them, network virtualization is a combination of technology and methodology that allows for the use of L3 network designs for the service provider, and L2 network designs for the consumer of the cloud. In this paper, a model is proposed to achieve network virtualization through VPN tunneling in IaaS Cloud.