robinkrens.nl - Linux Resources

This page lists some useful resources for a more in depth understanding on specific subjects. Assumed is that you have a basic understanding of Linux and Networking. If not, you might to start with one of the followings books

• http://linux-training.be - PDFs about the fundamentals, gives an overview of the most common tools and how to use them. PDFs contains some nice exercises.
• http://www.tlpd.org - The Linux Documentation project. Look for the UNIX and Internet Fundamentals HOWTO. (Do you really know what happens when you turn on a PC?)

Networking

A good way to understand more about networking is two setup two computers: a server and a client. And the play around with the tools. The following tools and documentation are extremely useful

Iptables

Although there is more abstract software to manage firewalls, like ufw on debian-based systems and firewall-cmd on redhat systems, Iptables will help you understand what actually happens during filtering, mangling or routing a package. https://www.frozentux.net/iptables-tutorial/iptables-tutorial.html has a structured approach in explaining what happends when a package hits the firewall.

Virtual Private Networks

Please have a look at http://www.robinkrens.nl/gfw.html

Cheatsheets

Here are some good cheatsheets for commonly used tools

• VI(M) - https://vim.rtorr.com
• GIT / GITHUB -