Software architecture of a (small) cloud

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http://www.linuxquestions.org – Hi, I was wondering, whether somebody of you could answer me for my problem. I am about to plan a tiny cloud, that is 2-3 servers that are supposed to run Xen (or similar, the technology does not matter here) Dom0s each providing again 3+ virtual machines (DomU). I know how I could connect each of those virtual machines to the internet/external network, my question relates though how I would design a virtual topology of adjacent and disjoint sub networks for those virtual machines. To make it easier to understand, what I want to achieve, a simple topology that (HowTos)