The best firewall will vary from one user to another, depending on your requirements. This article will highlight Linux firewall tools in no particular order. There are many open-source firewall software to choose from depending on your level of expertise, the size of the infrastructure to protect, convenience of use, or even whether there is a graphical tool for the firewall. For example, Firewalld is the default firewall software for Fedora, Red Hat, CentOS distros, while Debian and Ubuntu ship with the Uncomplicated Firewall. Many Linux distros have default firewalls built into the kernel and can be configured to offer excellent defense against network intrusion.
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