Dedoimedo posted a KVM tutorial
After reading my introduction tutorial from last week, you now know that KVM is not a dreadful monster, but a friendly and powerful virtualization software for Linux. It has both GUI and command line management tools, so you can choose whichever suits you best. Today, we'll expand our knowledge a bit. We will talk about network setups, although staying just short of bridged networking, which merits its own article.How to manage networks in KVM - Tutorial
We will learn how to add new virtual adapters, configure networks and IP addresses range using DHCP, learn the difference between NAT and Routed modes, toggle networks on and off, and a few more things besides. I'd like to warn you upfront this won't be the most existing tutorial, but it sure is useful.