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Originally Posted by SmajjL
So, if I did not install GUFW myself and activated it then Linux kernel by itself have firewall stuff built-in and blocks all by default?
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It depends on the distros. It's commonly disabled as default even if tools are already installed, usually left as an user choice to enable it.
Though I never done it myself, different sets of rules/configs can be switched depending on what you want to do at a given time. This involves dealing with services, but as usual, convenience/commodity/easy-going and best practices don't hold together.
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Using iptables or what ever just is a way to speak/control the kernels fw?
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Correct.
FWIW: Differences between iptables and nftables explained
https://linux-audit.com/differences-...les-explained/
Firewall for the lazy:
https://forums.bunsenlabs.org/viewtopic.php?id=1765