Linux is highly secure, but you should still have a firewall. You should know if your ISP's hardware (gateway) uses a firewall. One of the easiest Linux firewalls is UFW and its GUI sidekick, GUFW.
Although Linux has a firewall built into the kernel itself, it isn’t always the easiest to use, especially for new users to Linux, even when there are several graphical utilities that can help you ...
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