The IPFIREWALL (IPFW) is a FreeBSD-sponsored firewall application. It is a stateful firewall written for the FreeBSD system and supports both IPv4 and IPv6. The IPFW is included in the basic FreeBSD installation; you just need to load the module through the '/etc/rc.conf' file to enable it.

This tutorial will show you how to set up the Basic IPFW Firewall on FreeBSD 12.0. We will first set up the firewall with the default rules provided by FreeBSD and then with a custom rule.