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robinkrens.nl - Linux Resources

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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 -

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Networking

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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. -

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Netcat

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Simple tool to open or connect to TCP or UDP ports and output data through these channels. Build and test proxies. Powerful for debugging. Cryptcat is a similar tool, but with support for cryptography -

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Sendip

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Create and send IP, TCP or UDP packages. You are able to edit any value within these packages. -

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Iptables

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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. Pay extra attention to Network Address Translation. Here is another nice HOWTO: https://netfilter.org/documentation/HOWTO/NAT-HOWTO-5.html -

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Virtual Private Networks and Tunneling

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Please have a look at ./tunneling.html:tunneling.html -

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Cheatsheets

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Here are some good cheatsheets for commonly used tools -

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