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

View More author details

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

Failover and load balancing

In the past, we used to need a dedicated network appliance to deal with multiple internet connections and guarantee good availability of internet access. One of the best features of a modern firewall is working with multiple WAN connections. OPNsense has incredible features that we'll explore in this chapter so that it can be configured with various internet connections.

Failover

The first scenario we'll explore is the failover configuration; with two or more WAN connections, it is possible to configure OPNsense to change the active internet connection to a backup one automatically. An example of an OPNsense configured with two internet connections is shown in the following topology:

Figure 9.1 – Multi-WAN example scenario

As we can see in the preceding diagram, two WAN connections, A and B, are both connected to the internet and configured on OPNsense. WAN-A is configured in OPNsense as the primary connection...