systemd for Linux SysAdmins: All You Need to Know About the systemd Suite for Linux Users

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2025

D. Bothsystemd for Linux SysAdminshttps://doi.org/10.1007/979-8-8688-1328-3_10

10. Managing the Firewall with firewalld

David Both¹  

(1)

Raleigh, NC, USA

 

Objectives

In this chapter, you will learn to

• Describe the function of a firewall

• Define and describe the term “port”

• Use firewalld zones for firewall management under different sets of circumstances

• Set a default zone

• Assign network interfaces to a zone

• Modify existing zones

• Create a new zone to meet a set of specifications

• Integrate Fail2Ban dynamic firewall software with firewalld to automate protection against specific Internet attacks

Introduction

Firewalls are a vital part of network security, so it’s important ...