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OPNsense Beginner to Professional

OPNsense Beginner to Professional

By : Camargo
4.3 (8)
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OPNsense Beginner to Professional

OPNsense Beginner to Professional

4.3 (8)
By: Camargo

Overview of this book

OPNsense is one of the most powerful open source firewalls and routing platforms available. With OPNsense, you can now protect networks using features that were only previously available to closed source commercial firewalls. This book is a practical guide to building a comprehensive network defense strategy using OPNsense. You’ll start with the basics, understanding how to install, configure, and protect network resources using native features and additional OPNsense plugins. Next, you’ll explore real-world examples to gain in-depth knowledge of firewalls and network defense. You’ll then focus on boosting your network defense, preventing cyber threats, and improving your knowledge of firewalling using this open source security platform. By the end of this OPNsense book, you’ll be able to install, configure, and manage the OPNsense firewall by making the most of its features.
Table of Contents (25 chapters)
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1
Section 1: Initial Configuration
6
Section 2: Securing the Network
13
Section 3: Going beyond the Firewall

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.

Unbound

As the maintainers define it, "Unbound is a validating, recursive, caching DNS...

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