Security Onion is a free and open source intrusion detection system (IDS), security monitoring, and log management solution. It offers full packet capture, both network-based and host-based intrusion detection systems (NIDS and HIDS) It also includes powerful indexing, search, visualization and analysis tools to make sense of those mountains of data. It may be worth considering if you’ve got a deep enough security bench to customize, deploy and maintain Security Onion for your enterprise. Security Onion isn’t a silver bullet that you can set up, walk away from and feel safe.”]