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Welcome to Virtual Networks over linuX (VNX) web server

VNUML (Virtual Network User Mode Linux) is an open-source general purpose virtualization tool designed to quickly define and test complex network simulation scenarios based on the User Mode Linux (UML) virtualization software. VNUML is a useful tool that can be used to simulate general Linux based network scenarios. It is aimed to help in testing network applications and services over complex testbeds made of several nodes (even tenths) and networks inside one Linux machine, without involving the investment and management complexity needed to create them using real equipment.

VNX History

VNX (Virtualization over X) is the new release of the VNUML tool. VNX brings important new functionalities that overcome the most important limitations VNUML tool has:

  • Integration of new virtualization platforms to allow virtual machines running other operating systems (Windows, FreeBSD, etc) apart from Linux. In this sense:
    • VNX uses libvirt to interact with the virtualization capabilities, allowing the use of most of the virtualization platforms available for Linux (KVM, Xen, etc)
    • Integrates Dynamips to allow limited emulation of CISCO routers
  • Restart of individual virtual machines
  • Autoconfiguration and command execution capabilities for several operating systems: Linux, FreeBSD and Windows (XP and 7).

Information for users

Downloading VNX

You can download VNX from

VNX Root filesystems are temporarily hosted in