Before You Begin You need the following:
A system running on a Linux distribution and a Linux kernel version 4.
nftables replaces the successful iptables and its related frameworks built on Netfilter. With nftables come improvements to performance and usability, but also significant changes to syntax and usage.
Implemented as Netfilter modules, iptables is a user-space utility program that allows a system administrator to configure the IP packet filter rules of the Linux kernel firewall.
What is UFW? UFW, or uncomplicated firewall, is a frontend for managing firewall rules in Arch Linux, Debian, or Ubuntu.
FirewallD is frontend controller for iptables used to implement persistent network traffic rules. It provides command line and graphical interfaces and is available in the repositories of most Linux distributions.
TCP wrappers are a host-based access control system.
iptables is an application that allows users to configure specific rules that will be enforced by the kernel’s netfilter framework.
Firewall software is designed to limit access to network resources running on your Linode to authorized parties.
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