You can also view the articles that we explain Hacker Types and Attack Types.

Snort is a well-known open source intrusion detection and prevention. It analyze traffic, creates alerts, and record problematic packets. Rules can be customized based on a specific needs. You can download Snort, below.
https://www.snort.org

IPCop Firewall is a Linux firewall. It is used for Small Offices and Home Users. It has a very user friendly web-interface.You can download IPCop, below.
http://ipcop.org

Security Onion is a Network Security Monitoring and Intrusion Detection based on Linux. It contains Snort, Suricata, Sguil, Squert, argus, Xplico, tcpreplay, scapy, hping, and many other security tools.You can download Security Onion, here.
https://securityonion.net
You can also view the articles that we explain Hacker Types and Attack Types.
Gokhan Kosem is a Network Engineer, Instructor and the Founder of IPCisco.com with 15+ years of experience in Cisco, Nokia, Huawei, Juniper, Linux, Service Provider Networks, Routing and Switching technologies.
He has worked on the backbone networks of major service providers and network vendors including Nortel, Alcatel-Lucent (Nokia) and has extensive hands-on experience with Cisco, Huawei, Juniper and Nokia networking technologies.
He has trained thousands of networking students worldwide through IPCisco.com, Udemy, books, labs, quizzes, and educational content across multiple social media platforms.
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