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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. 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

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

Virtual Private Networks and Tunneling

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

Cheatsheets

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