Cloonix vs NetSim

Cloonix is a free, AGPLv3 suite of C software components for creating virtual networks with KVM-based virtual machines and containers. It runs as a user-land application on a Linux distribution, with a web platform also listed. Users assemble machines, containers, and network items, connect them through Open vSwitch bridges, and view the topology on a graphical canvas. Virtual machines use QEMU-KVM; crun containers can use ZIP files or directories as root filesystems. Elements include NAT, host TAP and physical interfaces, links between Cloonix networks, and packet transit for dropping, shaping, or delaying traffic. The project names Open vSwitch, crun, QEMU-KVM, SPICE, and Wireshark as key components. A Wireshark spy can display or save captures on supported interfaces but is not the complete Wireshark application. Wi-Fi emulation uses vwifi and iw. Installation offers a privileged bundle or cloonix-toy without root requirements. The homepage lists version 53.01, dated November 4, 2025.

NetSim is a browser-based simulator of Cisco networking hardware and software for certification training. Its preconfigured labs provide the materials needed to complete each objective. Learners can compare their configurations with expected configurations to identify mistakes and get instant feedback, while lab progress and history sync between devices. Labs run in a web browser on modern internet-capable devices without installation; supported systems include Linux, macOS, and Windows. Network Designer lets users create custom labs with complex topologies, devices, connections, annotations, imported icons, and saved device configurations. It is included with the listed certification-specific plans. NetSim also includes the IOS images needed for its labs, without requiring additional licensing of those materials. Listed lab packs cost $29 a year and include 10 or 16 guided labs. Certification plans cost $179 a year and list between 70 and 101 guided labs. Online licenses last one year from purchase and can be used without usage limits during that period.