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<h1><a name="section_1">robinkrens.nl - Linux Resources</a></h1>
<p>Although there is more abstract software to manage firewalls, like <em>ufw</em> on debian-based systems and <em>firewall-cmd</em> on redhat systems, Iptables will help you understand what actually happens during filtering, mangling or routing a package. <a href="https://www.frozentux.net/iptables-tutorial/iptables-tutorial.html">https://www.frozentux.net/iptables-tutorial/iptables-tutorial.html</a> has a structured approach in explaining <u>what happends when a package hits the firewall</u>. Pay extra attention to Network Address Translation. Here is another nice HOWTO: <a href="https://netfilter.org/documentation/HOWTO/NAT-HOWTO-5.html">https://netfilter.org/documentation/HOWTO/NAT-HOWTO-5.html</a>
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<h2><a name="section_1_2">Virtual Private Networks and Tunneling</a></h2>
-<p>Please have a look at <a href="http://www.robinkrens.nl/tunneling.html">http://www.robinkrens.nl/tunneling.html</a>
+<p>Please have a look at <a href="./tunneling.html:tunneling.html">./tunneling.html:tunneling.html</a>
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<h2><a name="section_1_3">Cheatsheets</a></h2>
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<li>VI(M) - <a href="https://vim.rtorr.com">https://vim.rtorr.com</a>
- </li><li>GIT / GITHUB - <a href="http://www.robinkrens.nl/cheatsheets/git.pdf">http://www.robinkrens.nl/cheatsheets/git.pdf</a>
+ </li><li><a href="./files/git.pdf">GIT and GITHUB</a>
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