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.
License
GNU General Public License version 3.0 (GPLv3), GNU Library or Lesser General Public License version 3.0 (LGPLv3), Other LicenseFollow Network Simulator (fork CORE - Live USB)
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User Reviews
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Very usable and easy for working.