a PDF version is also available to download here
Security Onion (SO) is a great open source project created by Doug Burks.
It is a Linux Distribution based on Ubuntu and bundled/configured with all the tools you need to get a powerful, and free, Network Security Monitoring system (NSM). It can be used to monitor your network traffic for suspicious activities and malware.
This guide is aimed at people who quickly want to get started with SO with the following basic functionalities:
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How to setup Security Onion on a home network with Splunk, email alerts and some basic tuning