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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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Do I need a firewall for my fedora 38? (lemmy.dbzer0.com)

submitted 11 months ago by [email protected] to c/[email protected]

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Do I need a firewall for my fedora 38?

I'm new to Linux, previously been on Windows where I used defender + Windows firewall. Now I'm on fedora which also have its firewall called firewalld. Are those sufficient, or do I need any other solutions for my security?

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[–] [email protected] 5 points 11 months ago* (last edited 11 months ago) (2 children)

I treat all guests on the network as potentially hostile, so I enable firewalls on all of my hosts.

I believe that Fedora's firewall is enabled by default, but it leaves open ports 1025-65535/tcp and 1025-65535/udp.

To lock down some sane defaults:

sudo firewall-cmd --permanent --remove-port=1025-65535/tcp
sudo firewall-cmd --permanent --remove-port=1025-65535/udp
sudo firewall-cmd --reload

Verify allowed ports with:

sudo firewall-cmd --list-ports

See also:

PS: if you have a Steam Link, you'll want to open these ports for connectivity:

sudo firewall-cmd --permanent --add-port=27031/udp  # steam remote play
sudo firewall-cmd --permanent --add-port=27036/udp  # steam remote play
sudo firewall-cmd --permanent --add-port=27036/tcp  # steam remote play
sudo firewall-cmd --permanent --add-port=27037/tcp  # steam remote play

[–] [email protected] 2 points 11 months ago

That is a really solid tip! Don't mind me if I yoink it.

[–] [email protected] 1 points 11 months ago

You can also achieve this by setting up VLAN for guests