You Asked: Which Firewall Is Most Commonly Used on Linux?

Iptables/Netfilter is the most popular command line based firewall. It is the first line of defence of a Linux server security. Many system administrators use it for fine-tuning of their servers.

What are the firewalls in Linux?

What Is a Linux Firewall?

• A command line or GUI utility.
• A standalone Linux firewall solution.
• Endian Firewall Community (EFW)
• Gufw Firewall.
• IPFire.
• Nebero Systems Linux Firewall.
• OPNsense® Business Edition.
• Shorewall.

What is the default firewall in Linux?

iptables is a built-in firewall in Linux. It is a user based application for configuring the tables provided by the Linux kernel firewall. iptables is the default firewall installed with Red Hat, CentOS, Fedora Linux, etc.