OPNsense Beginner to Professional: Protect networks and build next-generation firewalls easily with OPNsense

Description

Work with one of the most efficient open-source FreeBSD-based firewall and routing solutions to secure your network with ease #### Key Features - Learn end-to-end OPNsense firewall implementation and management - Defend against attacks by leveraging third-party plugins such as Nginx and Sensei - Grasp hands-on examples and labs to become proficient with OPNsense firewall #### Book Description 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. #### What you will learn - Understand the evolution of OPNsense - Get up and running with installing and setting up OPNsense - Become well-versed with firewalling concepts and learn their implementation and practices - Discover how to apply web browsing controls and website protection - Leverage Sensei to implement next-generation firewall features - Explore the command-line interface (CLI) and learn the most relevant FreeBSD commands #### Who this book is for This OPNsense firewall book is for system administrators, network administrators, network security professionals, and enthusiasts who wish to build and manage an enterprise-grade firewall using OPNsense. A basic understanding of how a firewall works will be helpful to make the most of this book. Cover Title Page Copyright and Credits Dedication Contributors Table of Contents Preface Section 1: Initial Configuration Chapter 1: An OPNsense Overview About the OPNsense project Project history A new project with a lot of improvements on old code Rock-solid FreeBSD – HardenedBSD FreeBSD Why OPNsense? My personal experience Features and common deployments Core features Common deployments Where to get help? Some facts Summary Chapter 2: Installing OPNsense Technical requirements Versions and requirements Versioning Hardware Downloading and installing OPNsense Configuring VirtualBox to install OPNsense Mounting the OPNsense ISO file Installing OPNsense Unmounting the ISO installation file Setting up a LAN network Configuring network interfaces Updating firmware Checking for system updates in WebGUI Checking system updates using the CLI Installing plugins Advanced – Accessing the CLI through SSH FreeBSD packages PKG basic operations Summary Chapter 3: Configuring an OPNsense Network Technical requirements Hardware considerations FreeBSD NIC names The ifconfig command Basic network configuration WebGUI – network interface configuration Assigning network interfaces Overview of the network interface Types of interfaces Bridge GIF GRE LAGG Loopback VLAN VXLAN Proposed exercise – creating another type of network interface Exploring virtual IPs IP alias CARP Proxy ARP Proposed exercise – creating a virtual IP address Network diagnostics and troubleshooting True story – how to use ARP Table diagnostics Common issue – local network hosts can't open websites Summary Chapter 4: System Configuration Technical requirements Managing users and groups Creating users and groups External authentication Certificates – a brief introduction General settings The administration page The General page About OPNsense logging Advanced settings Cryptography settings Configuration backup Summary Section 2: Securing the Network Chapter 5: Firewall Technical requirements Understanding firewalling concepts A stateful firewall The Packet Filter Firewall aliases Importing and exporting aliases The firewall rules The rule processing order Rule actions Firewall settings Diagnostics and troubleshooting Troubleshooting Summary Chapter 6: Network Address Translation (NAT) Technical requirements NAT concepts Port forwarding Caveats Creating a port forwarding rule Outbound NAT NAT outbound modes Adding an outbound NAT rule One-to-one NAT Adding a one-to-one NAT rule Summary Chapter 7: Traffic Shaping Technical requirements Introduction to traffic shaping dummynet and ipfw – a brief introduction Possible scenarios Controlling hosts' and users' bandwidth usage Protocol prioritization Creating rules Monitoring Summary Chapter 8: Virtual Private Networking Technical requirements OPNsense core VPN types IPSec OpenVPN IPsec versus OpenVPN Site-to-site deployments using IPsec Phase 1 configuration Phase 2 configuration IPSec BINAT IPSec diagnostics VPN deployments using OpenVPN Site-to-site deployment Remote user deployment OpenVPN diagnostics OpenVPN is connected but the traffic is not reaching the tunnel's destinations OpenVPN client is not connecting to the server/a site-to-site tunnel doesn't become up A single user cannot connect Summary Chapter 9: Multi-WAN – Failover and Load Balancing Technical requirements Failover and load balancing Failover Creating gateway groups Policy-based routing Creating a firewall rule to enable the failover configuration Load balance Troubleshooting Summary Chapter 10: Reporting Technical requirements System health graphs RRDtool and health graphs Understanding Netflow and how to use it Configuring Netflow in OPNsense Exploring real-time traffic Troubleshooting common problems in the network using Netflow and graphs Summary Section 3: Going beyond the Firewall Chapter 11: Deploying DHCP in OPNsense Technical requirements DHCP concepts DHCP server DHCP relay Diagnostics Summary Chapter 12: DNS Services Technical requirements Core DNS services Default DNS resolvers on OPNsense DNS plugins DDNS Troubleshooting Making a DNS lookup using the CLI Summary Chapter 13: Web Proxy Technical requirements Web proxy fundamentals The explicit method The transparent method Why use a web proxy? OPNsense web proxy core features Basic configuration Custom error pages Configuring a web proxy with the explicit method Testing the web proxy Transparent web proxy configuration Additional web proxy configurations Web filtering Web filtering practice Web filtering – final thoughts Reading logs and troubleshooting Log files Web proxy service issues Summary Chapter 14: Captive Portal Technical requirements Captive Portal concepts OPNsense Captive Portal implementation Setting up a guest network Testing the configuration Using voucher authentication Web proxy integration Common issues HTTPS page redirection while using the Captive Portal Summary Chapter 15: Network Intrusion (Detection and Prevention) Systems Technical requirements IDS and IPS definition Suricata and Netmap Rulesets Configuration Testing SSL fingerprint Troubleshooting Summary Chapter 16: Next-Generation Firewall with Zenarmor Technical requirements Layer7 application control with Zenarmor Choosing a Zenarmor edition Hardware requirements Paid subscriptions Installing and setting up the Zenarmor plugin Summary Chapter 17: Firewall High Availability Technical requirements High availability concepts Active-active and active-passive modes CARP – how it works The preempt behavior Configuring high availability Proposed scenario Testing the HA configuration Caveats Summary Chapter 18: Website Protection with OPNsense Technical requirements Publishing websites to the world About the NGINX plugin NGINX Installing and configuring the NGINX plugin Adding WAF rules Troubleshooting Testing for configuration issues Logs reading Summary Chapter 19: Command-Line Interface Technical requirements Directory structure Managing the backend daemons Useful system commands Advanced customization Customizing the XML configuration file Filtering log files Filtering logs Summary Chapter 20: API – Application Programming Interface Technical requirements Concepts Setting up API keys API calls GET method example POST method example Summary Index About Packt Other Books You May Enjoy