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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

DHCP concepts

Let's suppose you are in charge of setting up a new small local network with 30 hosts, and let's assume IP version 4 (IPv4) addressing in this example. Now, think how much time setting up the IP address in each host will take. A lot, right? Setting it up in a server or gateway on the network will save a lot of time managing its IP address. So, to solve this problem, we can count on DHCP. OPNsense has a DHCP server that can be configured to deploy IP addresses to the network's hosts. DHCP works in a client/server manner, and it uses the User Datagram Protocol (UDP) to work, specifically on port 67. We will explore both IPv4 and IPv6 in this chapter. The process of a host taking a DHCP lease, which is how the IP addressing lease is named, is represented in the following diagram:

Figure 11.1 – DHCP addressing process

Next, we'll see how to configure the DHCP service on OPNsense for IPv4 addressing.

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