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Secure and efficient network virtualization is a key building block for virtualized environments such as data centers or enterprise networks. While machine virtualization alone provides immediate isolation of computing resources such as memory and CPU between guest domains, the network remains to be a shared resource as all traffic from guests eventually pass through a shared network resource and end up on the shared physical medium. This paper presents the findings of a comparative study that conducted to evaluate the security, performance, and manageability of these approaches. The paper further reports the experiences with prototype implementations on Xen platforms.
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