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Implementing a firewall is crucial for securing your Linux system. There are an array of popular software firewalls to choose from, and each offers unique features. So understanding how these tools compare can help you choose the best firewall for your needs.
When it comes to network security, the age-old question is whether to deploy firewalls near your network perimeter, or close to your application servers. You can and should do both.
Moving to the cloud has many advantages, including flexibility, reduced management overhead, performance, and security. Cloud-based firewalls can offer finer-grained access control and more comprehensive threat mitigation than their traditional hardware-based counterparts.
You need the following:
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. Use this guide to get started learning about what nftables is and how it differs from iptables. Follow along with this guide’s example to implement your own rules in nftables and get a hands-on idea of what it can do.
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. The filters are organized into tables containing chains of rules which govern how to treat network traffic packets.
UFW, or uncomplicated firewall, is a frontend for managing firewall rules in Arch Linux, Debian, or Ubuntu. UFW is used through the command line (although it has GUIs available), and aims to make firewall configuration easy (or, uncomplicated).
Firewalld is frontend controller for nftables (or its older counterpart, 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. The following distributions have firewalld installed by default: RHEL and its derivatives (including CentOS, AlmaLinux, and Rocky Linux), CentOS Stream, Fedora, and openSUSE Leap.
iptables is an application that allows users to configure specific rules that will be enforced by the kernel’s netfilter framework. It acts as a packet filter and firewall that examines and directs traffic based on port, protocol and other criteria. This guide will focus on the configuration and application of iptables rulesets and will provide examples of ways they are commonly used.
netfilter
Firewall software is designed to limit access to network resources running on your Linode to authorized parties. Some services, such as a public web server, may be accessible to anyone. Others might be more restricted, such as an SSH daemon for remote system administration.
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