NetSim Community Edition

The Open Source Network Simulator

Engineered for High-Performance Network Labs.
A deterministic simulation engine written in Rust and compiled to WebAssembly.
Zero virtualization. Zero latency. 100% Browser-native.

Live Demo (SaaS) • Report Bug • Request Feature

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🚀 Overview

NetSim Community Edition is the open-source core engine behind NetSim.dev. Starting with v1.1.0, the core simulation logic has been migrated from TypeScript to Rust/WebAssembly to achieve near-native execution speeds and deterministic protocol behavior.

It provides a high-performance, client-side network simulation environment that runs entirely in your browser, bypassing the need for heavy VMs or backend servers.

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✨ Key Features (v1.1.0 WASM Core)

• 🦀 Rust-Powered Engine: High-performance core handling packet switching and complex routing logic with memory safety.
• 🌐 100% Client-Side: Runs entirely in your browser using WebAssembly. Zero latency, zero data egress.
• 🔌 Multi-Vendor CLI: Native support for Cisco (IOS) and Huawei (VRP) command syntaxes.
• 🔒 Privacy First: Your topologies and configurations never leave your machine.
• 🔋 Built-in Labs: Ready-to-use scenarios for STP, OSPF, and VLAN practice.
• 🛠️ Modern Stack: Built with React 18, Rust, and React Flow.

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👀 Visuals

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📦 Quick Start

Prerequisites: Node.js 18+, Rust toolchain, and wasm-pack.

# 1. Clone the repository
git clone [https://github.com/netsim-labs/netsim.git](https://github.com/netsim-labs/netsim.git)

# 2. Enter the directory
cd netsim-community-v1.1.0

# 3. Build the WASM Core and Install JS dependencies
npm install

# 4. Start the local engine
npm run dev

🏗️ Architecture

NetSim utilizes a decoupled architecture where a high-speed Rust core manages the network state, exposed to a React frontend via a typed WebAssembly bridge.

Layer	Technology	Description
Core Engine	Rust + WASM	Logic for OSPF, BGP, STP, and CLI parsing.
State Management	Zustand	Syncs the WASM state with the UI components.
Visualization	React Flow	Interactive node-based topology editor.
Interface	Tailwind CSS	Responsive, dark-themed professional UI.

🤝 Contributing & Governance

We welcome contributions! Please follow these steps:

1. Read our Code of Conduct to maintain a professional environment.
2. Fork the repo and create your feature branch.
3. Ensure your Rust modules pass all tests (cargo test).
4. Open a Pull Request.

📄 License

Distributed under the GNU Affero General Public License v3.0 (AGPL-3.0).

• Free for personal and educational use.
• Commercial use requires a dedicated license. Contact info@netsim.dev.

Made with ❤️ and Data Packets by the NetSim Labs Team

Copyright © 2026 NetSim Labs. All rights reserved.