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The Common Open Research Emulator (CORE) is a tool for emulating networks on one or more machines. You can connect these emulated networks to live networks. CORE consists of a GUI for drawing topologies of lightweight virtual machines, and Python modules for scripting network emulation.
User mode linux virtual machines management in pure bash 3.x Manages separate hosts and virtual networking on linux host, firewalling planned. This tool aims to be lightweight production environment controler, not a huge virtual network simulator.