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

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

Troubleshooting

In this section, we will explore some of the common issues you may face while using an I(DP)S in OPNsense and also how to solve each:

Poor performance while using IPS: First things first – plan your IPS deployment with care! IPS mode is a resource-consuming feature, and you will need suitable hardware with a high-clock CPU, multicores, and good network cards to get the IPS working well in a high-traffic network. The recommended pattern matcher is Hyperscan, which works well with supported CPUs (SSE3-capable). A long list of enabled rulesets will demand a lot of RAM if you wish to inspect traffic without issues. A common symptom of this issue is high CPU usage and low bandwidth, especially from WAN, while using IPS mode. If your hardware isn't working reasonably with IPS mode on, it might be good to keep it only in IDS mode, which will consume fewer resources.
A lot of false positives: A good deployment plan will avoid this kind of situation....