Network Security Monitoring Explained (Part 1): NSM, Security Onion & Real-World Detection | Ep. 8

🚨 Episode 8 – Part 1 of 2 | Everyday Cyber Podcast
In this first part of a two-part deep dive, host Alex Reid breaks down the essentials of Network Security Monitoring (NSM) — how it works, why it matters, and the open-source tools that power real-time detection and response.

From understanding the Intrusion Kill Chain to deploying tools like Security Onion, Zeek, and Suricata, this episode helps you build foundational knowledge in modern network defense.

🔍 In this episode (Part 1):

• What is NSM and how it differs from continuous monitoring

• Why prevention fails — and how NSM fills the gap

• Data types in NSM: full content, session, alerts, and metadata

• Challenges with proxies, NAT, and the X-Forwarded-For header

• Overview of open-source NSM tools (Security Onion, Bro/Zeek, Suricata, Sguil)

🧠 This episode is ideal for SOC analysts, blue teamers, cybersecurity students, and anyone learning how defenders really detect threats.

🎧 Part 2 coming next week.

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intrusion kill chain explained

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x-forwarded-for proxy logs

nsm data types explained

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