What is Network Virtualization?
Network virtualization is a specific abstraction of a physical network that allows the support of multiple logical networks running on a common shared physical infrastructure.
How to implement Network Virtualization?
In order to virtualize network, we first build virtual nodes or machines on physical infrastructure.
One particular approach for doing that is the Xen Virtual Machine Monitor. Another is User-Mode Linux, with something called network namespaces. Network namespaces were originally an add
on to the Linux kernel and they're now part of the main line Linux kernel.
KVM is another virtualization technology. And there's certainly others as well. VMWare of course makes their own commercial virtual machine technology. And Virtual Box is one that free choice.
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