📡 NetSim — Network Packet Flow Simulator

Free browser-based packet-flow visualization tool — watch packets traverse routers, switches, firewalls in real time

See L2 → L3 → L7 packet flows, ARP/MAC tables fill, routing decisions, ACL matches, and firewall state transitions — entirely in your browser. No virtual machines, no licenses.

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🏛️ Built by Networkers Home

NetSim was built by Networkers Home — India's leading Cisco + cybersecurity training institute (Bengaluru, since 2005). It's a free practice companion to our CCNA and Network Engineering programs — built specifically for students struggling with the invisible part of networking: what actually happens to a packet as it crosses each device.

Most students memorize routing tables. Networkers Home students see them fill, age out, and converge in real time on real Cisco hardware. NetSim is the visualization training wheel before the live lab. Book a demo class →

Compare top networking institutes: Top 10 CCNA Bangalore · Top 10 Networking Bangalore · Top 10 Cybersecurity India

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✨ Features

• L2 Frame Visualization — see source/dest MAC, VLAN tags, frame fields, switch MAC-table lookups
• L3 Routing Decisions — watch routing table lookups, longest-prefix matches, next-hop resolution
• ARP Process — step through ARP requests/replies, view ARP cache fill and timeouts
• ACL Evaluation — packets walk top-down rule lists with explicit allow/deny matches
• Firewall State Tables — stateful inspection visualization (established, NEW, RELATED)
• No Backend Required — runs entirely in browser, free, no signup

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🚀 Try It

git clone https://github.com/NETWORKERS-HOME-123/netsim.git
cd netsim
npm install
npm run dev

Open http://localhost:5173 and start visualizing.

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📚 Related Networkers Home Resources

• CCNA Course in Bangalore
• Networking Course in Bangalore
• Network Engineering Course Bangalore
• Cisco Real Sim (CLI lab sibling)
• All Networkers Home Courses

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📄 License

MIT © Networkers Home