All courses
Resource hub
Featured resource
Tech Upskilling Playbook 2025
Tech Upskilling Playbook

Build future-ready tech teams and hit key business milestones with seven proven plays from industry leaders.

Learn more
Hamburger Icon
  • Labs icon Lab
  • Cloud
  • Security
Google Cloud Platform icon
Labs

Using 'firewalld' for Advanced Packet Filtering

Managing a local firewall is something pretty much every Linux admin is going to have to do during their career. Many operating systems have adopted firewalld as the local firewall management system moving forward. Setting this up can lead to a more secure server and increase security through your environment.

Get started Contact sales
Google Cloud Platform icon
Labs

Path Info

Level
Clock icon Intermediate
Duration
Clock icon 1h 0m
Last updated
Clock icon Aug 13, 2025

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.

Table of Contents

  1. Challenge

    Block SSH but allow HTTP

    Use the block zone to filter on specific hosts and ports.

    You can run the following commands:

    firewall-cmd --zone=block --add-source=10.0.1.101

    firewall-cmd --zone=block --add-service=http

    You can verify settings with:

    firewall-cmd --info-zone=block

  2. Challenge

    Allow ping

    Since ping uses the ICMP protocol and not a specific port, we can't just add a port or service.

    We need to use a rich rule:

    firewall-cmd --zone=block --add-rich-rule='rule protocol value="icmp" accept'

Pluralsight Skills - Labs - Pluralsight
Author
Pluralsight Skills

Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.
Ready to get started?
View individual plans View team plans