I'm studying computer networking and already have some experience with C++. I'd like to build several projects alongside my coursework so I can understand the concepts more deeply and create useful portfolio pieces. I'm looking for ideas at different difficulty levels: an approachable beginner project, an intermediate project using several networking concepts, and a more advanced project that combines multiple topics. Ideally, these should be practical projects I can implement from scratch rather than simply copy from a tutorial.
3 Answers
Consider working below the usual IP-layer examples by experimenting with Ethernet frames or a protocol such as BACnet. You could begin with a small ARP responder that answers who-has requests for a pretend IP address, then move on to constructing and inspecting packets with raw sockets. This is a great way to learn packet headers, byte order, and what actually happens before higher-level socket calls are involved.
A good progression would be to build a basic mail-transfer client or server without relying on a mail library. You’ll need to read the protocol specification, handle commands and responses, and manage connections yourself. After that, try writing a small HTTP web server, and eventually a simple command-line web browser. Each step adds more parsing, protocol handling, and networking logic.
A firewall-log parser would be a useful smaller project. Make it a command-line tool that reads log files, extracts fields such as source and destination addresses, ports, protocols, and actions, then produces summaries or filters suspicious traffic. You can gradually add support for different log formats and export statistics once the basic parser works.
I haven’t worked with those protocols before, but they sound like a great way to understand the lower layers. I’ll look into them—thanks for the suggestion!