In this column I have often highlighted how handling virtualisation security is a far different matter from managing the old kind of security. Today, I’d like to discuss yet another example of these differences: virtual machine to virtual machine communications. As readers surely are aware of, all virtualisation solutions – albeit with slightly different approaches – support virtual networks between virtual machines, whereas virtual switches or virtual cables are connected between virtual machines. That is, network data flows between virtual network cards without ever leaving the host. This comes to no surprise, since a virtual network like that has been designed for that very purpose

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