To get the most out of this book

In this book, we have used the latest stable version of pfSense, which is 2.4.3. The minimum hardware requirements, as of the latest version, are 500 Mhz CPU and 512 MB of RAM. The recommended requirements are a bit higher than these such as 1 Ghz CPU and 1 GB of RAM. 

For some of the topics, you may need to take some initial steps, such as signing up for services and launching a virtual machine.