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This is a walkthrough for setting up a virtual network of multiple User-Mode Linux instances.
When evaluating a new product or planning your firewall or VPN, it is always handy to be able to emulate your network virtually. Many people use VMware for this task and, although VMware does a very good job, it is quite cost-intensive. In this article, I'll describe how to use User-Mode Linux (UML) to model a network. UML is a Linux kernel capable of running on Linux. It offers networking, access to the host filesystem, jail, and honeypot features. Using virtual switches, you can combine several hosts to form a network. To use UML, you just need a Linux filesystem that the UML kernel can boot. I will also show how to use UML to emulate a testbed for a VPN solution.
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