this post was submitted on 06 Aug 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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ebtables
andiptables
can be very complex. And I failed my 1st RHCE exam because of them. But once you learn, you will never unlearn, as they are quite beautifully crafted. You just need to get into the mindset of the people who wrote the tools…Look into
firewalld
It has a rather simplified cli interface:firewall-cmd
The manpages will tell you a lot.
firewall-cmd —add-service=ssh
Will open the ports for your ssh daemon until you reload your firewall or reboot your systemfirewall-cmd —permanent —add-service=ssh
Will open the ssh ports until you remove themfirewall-cmd —list-all
Will show you the current firewall configTry nftables directly, it's simple and straightforward, scripting syntax is easy.
Another simpler frontend for iptables I think is well suited for desktop environemnts is ufw. It does what it's supposed to do and is extremely simple to use
I personally do not know ufw, but if it does what it must, then you’re solid.
Linux is also about choices: do stuff the way you choose to, and makes you comfortable.