Book Image

OPNsense Beginner to Professional

By : Julio Cesar Bueno de Camargo
5 (1)
Book Image

OPNsense Beginner to Professional

5 (1)
By: Julio Cesar Bueno de 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)
1
Section 1: Initial Configuration
6
Section 2: Securing the Network
13
Section 3: Going beyond the Firewall

Troubleshooting common problems in the network using Netflow and graphs

The available OPNsense reporting tools can help us solve some problems related to performance. Based on my experience, I will give some examples of when these reporting tools can help a lot while solving issues:

  • Network Connectivity Issues: Sometimes, you can face connectivity issues related to packet loss, latency, or both. When this kind of issue occurs – commonly on WAN interfaces, depending on the number of services enabled on OPNsense, such as VPN and Proxy, to name a few – you will receive a lot of complaints. A good starting point is checking the WAN links and quality graphs, as these are helpful resources. Even if you watch the gateway's status closely while running pings and other known network tools, the traffic and quality graphs will show a historical view of this data, which gives you a better analytical point of view.
  • Slow System/System Crashes: When the whole system...