TanayK07

TanayK07 / networking-from-scratch

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Build the network stack from raw bytes. 289 hands-on lessons in C and Python — from Ethernet frames to TLS 1.3

networkingfromscratch.vercel.app c learn-networking linux networking systems-programming
24
1
100% credibility
Found May 24, 2026 at 35 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
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AI Summary

Networking from Scratch is a free, open-source educational curriculum that teaches networking from the physical layer up through advanced topics like TLS, kernel modules, and container networking. It guides learners through 289 hands-on lessons where they build every component themselves in C and Python — CRC checksums, signal encoding, Ethernet frames, TCP/IP stacks, and more. The project is well-structured with clear prerequisites, a curated roadmap, and a contributing guide. No malicious functionality was found.

How It Works

1
🔍 You find a networking guide online

You stumble across a website called 'Networking from Scratch' that promises to teach you how the internet really works — by building everything yourself from raw bytes.

2
📚 You see the big picture

The curriculum shows 15 phases: from how electricity carries bits, up through Ethernet frames, IP addressing, TCP connections, encryption, and even how robots talk to each other. 289 lessons planned.

3
💻 You set up your learning environment

You download the project and run a simple setup script. Now you have a C compiler and Python ready on your machine, just like a real network engineer.

4
🔧 You build things that actually work

You write code that turns numbers into network packets. You create your own CRC error-detection codes, encode signals like old ethernet did, and build Hamming codes that fix single-bit errors automatically.

5
You explore different paths
📡
The packet sniffer path

You capture real Ethernet frames off your network card, inspecting every MAC address and EtherType — no shortcuts, just raw bytes.

🛠️
The virtual networking path

You create virtual network devices on your computer that let you build and test a full TCP/IP stack entirely in software.

6
✅ You run the tests and they all pass

Every lesson comes with tests you can run with a single command. You verify that your CRC implementation matches the standard, your packet parser handles every edge case correctly.

🎉 You understand how the internet really works

By the end, you can look at a hex dump of a real network packet and understand every single byte — why it's there, what it means, and how it got there. You built it yourself from scratch.

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AI-Generated Review

What is networking-from-scratch?

This is a 289-lesson curriculum that teaches you to build the entire network stack from raw bytes. Starting with bits and wires, you work your way up through Ethernet frames, TCP/IP, sockets, TLS 1.3, kernel modules, and eBPF. Everything is implemented in C and Python from scratch -- no frameworks, no libraries, just hand-rolled protocol implementations that you can actually run and test. By the end, you have a working userspace TCP stack, a TLS 1.3 implementation, and kernel-level code that hooks into Netfilter.

Why is it gaining traction?

The pitch is compelling: understand what is actually happening when you call `send()` or inspect a packet in Wireshark. Most networking knowledge is layer-upon-layer of abstraction -- this project strips that away. Each lesson follows a consistent format: problem statement, theory, formal spec, annotated code walkthrough, tests, and graded exercises. The curriculum spans 15 phases from physical encoding up to modern container networking and robotics middleware. It is the "write your own database" approach applied to networking.

Who should use this?

Backend engineers who want to understand what happens below the socket API. Systems programmers curious about kernel networking internals. DevOps and SREs who debug network issues but want deeper intuition than tcpdump provides. Students who have read Stevens' TCP/IP Illustrated and want to implement the examples themselves. Not for beginners -- you need comfortable C (pointers, bitfields, memcpy) and Python (bytes, struct, asyncio) before starting.

Verdict

The ambition is impressive and the pedagogical structure is sound, but at 24 stars with only 3 of 289 lessons fully written, this is early-stage and unproven. The 1.0% credibility score reflects that reality. If you want to deeply understand networking by building it yourself, watch this project -- or better yet, contribute a lesson. As-is, it is a promising outline, not a finished product.

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