Overview
A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on a set of security rules. Firewalls typically establish a barrier between a trusted internal network and untrusted external network.
Using an open source firewall service, setup and configure the firewall to monitor, accept, and deny traffic based off of a set of rules you create. Connect the firewall to a trusted internal network or virtual lab.
Popular Open Source Firewalls:
- pfSense
- OPNsense
- Untangle – NG Firewall
Project Recommendations
It is recommended you have familiarity with the foundations of networking, basic understanding of firewall types and how they work, the TCP/IP and OSI model, networking protocols, use of virtualization software / hypervisor, and formidable research skills.