You're reading from OPNsense Beginner to Professional Protect networks and build next-generation firewalls easily with OPNsense

Product type Paperback

Published in Jun 2022

Publisher Packt

ISBN-13 9781801816878

Length 464 pages

Edition 1st Edition

Tools

FreeBSD

Concepts

Network Security

Author (1):

Julio Cesar Bueno de Camargo

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Table of Contents (25) Chapters

Preface

1. Section 1: Initial Configuration

2. Chapter 1: An OPNsense Overview FREE CHAPTER

3. Chapter 2: Installing OPNsense

4. Chapter 3: Configuring an OPNsense Network

5. Chapter 4: System Configuration

6. Section 2: Securing the Network

7. Chapter 5: Firewall

8. Chapter 6: Network Address Translation (NAT)

9. Chapter 7: Traffic Shaping

10. Chapter 8: Virtual Private Networking

11. Chapter 9: Multi-WAN – Failover and Load Balancing

12. Chapter 10: Reporting

13. Section 3: Going beyond the Firewall

14. Chapter 11: Deploying DHCP in OPNsense

15. Chapter 12: DNS Services

16. Chapter 13: Web Proxy

17. Chapter 14: Captive Portal

18. Chapter 15: Network Intrusion (Detection and Prevention) Systems

19. Chapter 16: Next-Generation Firewall with Zenarmor

20. Chapter 17: Firewall High Availability

21. Chapter 18: Website Protection with OPNsense

22. Chapter 19: Command-Line Interface

23. Chapter 20: API – Application Programming Interface

24. Other Books You May Enjoy

Chapter 6: Network Address Translation (NAT)

Following the last chapter, where we explored firewalling, Network Address Translation (NAT) is a simple way to have an entire local network using a single public IP address. Since NAT is an IPv4-exclusive method, we will not explore IPv6 and its equivalent NPTv6 (also known as NAT66). This book aims to provide valuable and practical information. Unfortunately, these days, IPv6 and NPTv6 aren't the predominantly used technology in local networks.

IPv6 Adoption

According to Google's IPv6 statistics page (in July 2021), IPv6 adoption was 35% globally (https://www.google.com/intl/en/ipv6/statistics.html).

Coming back to our chapter's topic, we will learn about NAT concepts, which types OPNsense supports, and how to create NAT rules on WebGUI. By the end of this chapter, you will be able to manage NAT rules on OPNsense and will understand how the NAT method works.

The following are the topics we'll explore in...