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this post was submitted on 06 Aug 2023
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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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Thank you for the advice!
Firewall on Linux is something I still don't understand, and explanations found on Internet have always confused me. Do you happen to know some good tutorial to share? Or maybe one doesn't need to do anything at all in distros like Ubuntu?
Regarding ssh: you only mean incoming ssh, right?
ebtablesandiptablescan 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
firewalldIt has a rather simplified cli interface:firewall-cmdThe manpages will tell you a lot.
firewall-cmd —add-service=sshWill open the ports for your ssh daemon until you reload your firewall or reboot your systemfirewall-cmd —permanent —add-service=sshWill open the ssh ports until you remove themfirewall-cmd —list-allWill show you the current firewall configAnother 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.