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Virtual machines are of very little use if they cannot access the underlying physical network. Virtualizing the network has traditionally been considered a challenge best met by such network-centric measures as VLANs, implemented by switches. The authors begin by arguing that network virtualization is best done by hypervisors, not switches. They, then show that modern hypervisors do a poor job in virtualizing the network, leaking details of the physical network into virtual machines. For example, IP addresses used across the host's physical network, are exposed to guest virtual machines.
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