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

Core DNS services

The DNS protocol is the base of our modern internet. It makes it easy for users to find websites and other services available on the internet without remembering every website’s Internet Protocol (IP) address. To resolve website names to IP addresses, we have two classes of DNS services—servers that host domain entries, and recursive resolvers that translate domain names to IP addresses. OPNsense can become a DNS server and host domain entries. It isn’t recommended to transform a firewall into a DNS server for security best practices, so we’ll explore only the DNS resolver feature in this chapter.

Default DNS resolvers on OPNsense

OPNsense has two DNS resolver services installed by default—Dnsmasq and Unbound. The last one became the default service since the 17.7 OPNsense version. We’ll discuss both services one by one.