Commercial, open source, and Linux-based tools
We will start with a general category – open source and commercial tools. In addition to this, some of us are used to working with Windows, while others are used to Linux (and laugh about the former). We will talk about both Windows and Linux while focusing on open source tools and, when required, tools that we need to write ourselves.
We can divide security tools according to their objectives, what they do, what we test, and what we are trying to protect. For example, some tools are used to test communications servers, and we can use them to protect these servers.
Our book is about network protocols, so we will focus on network-oriented attacks and protection. The first type of tool that we will work with is open source tools.
Open source tools
All the tools we recommend in this book are free. Some of the tools are open source, some are commercial tools available for free in basic versions, and most of them are fully...