Network Security
Packets, firewalls and detecting attacks on networks.
Beginner
Start here. No background needed beyond school maths.
Cloudflare Learning: Security
Plain explanations of DDoS, firewalls, VPNs, zero trust and more.
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Wireshark User's Guide
How to capture and read network traffic with the standard packet analyser.
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Advanced
Once the basics are comfortable.
Security Onion Documentation
A free platform that gathers network traffic and alerts for threat hunting. The docs show how to set it up and how an analyst uses it.
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Snort 3 Rule Writing Guide
Learn to write rules for ••••, a widely used intrusion detection system: rule structure, options and how traffic is matched.
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Zeek Documentation
Zeek turns raw network traffic into detailed logs and scripts you can write to look for suspicious behaviour.
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Suricata Documentation
Docs for an open-source network threat detection engine and its rules.
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