Security Onion

Security Onion is a free and open Linux distribution for threat hunting, enterprise security monitoring, and log management. Its first release was in 2009.

Security Onion combines various tools and technologies to provide a robust IDS solution, including:


 * Suricata and Zeek (formerly Bro): These are network-based IDS tools that monitor network traffic for suspicious activities.
 * OSSEC: A host-based IDS that monitors system logs and file integrity.
 * Elasticsearch, Logstash, and Kibana (ELK stack): These tools are used for log management and analysis, allowing for effective visualization and querying of security events.