OPNsense® | Installation, Administration and Configuration

OPNsense® is a powerful, FreeBSD-based, open-source firewall and routing platform. It offers features typically found only in expensive enterprise solutions: from Stateful Packet Inspection (SPI) above Intrusion detection/prevention (IDS/IPS) up to Two-Factor Authentication (2FA). Thanks to its intuitive web interface and regular security updates, it is the ideal choice for modern network security.

We'll show you how to plan, install, and manage a production-ready security infrastructure using OPNsense®. This course is designed for administrators who want to migrate from proprietary solutions to open-source or deepen their expertise.

What is OPNsense®?
OPNsense® is an open-source firewall and routing platform based on FreeBSD that combines maximum security, stability, and flexibility. The solution offers features such as stateful packet inspection, VPN, intrusion detection and prevention, traffic shaping, and comprehensive reporting and monitoring tools. Its modern web interface allows for intuitive management and customization to individual requirements. Thanks to regular updates, active community support, and professional extensions, OPNsense® is a powerful alternative to commercial firewall systems – ideal for businesses, educational institutions, and public sector organizations.

Who is this course suitable for?
Admins, IT professionals and network specialists who want to use a powerful, secure and flexible open-source firewall solution – whether in the corporate network, in the data center or in smaller environments.
Basic knowledge of networks and IT security is an advantage.
– Ideal for getting started with firewall management, routing and VPN with OPNsense®

Agenda

Setting up, configuring and securing a professional firewall environment.

• Basics & Installation
• Rules ([NEW]Firewall Rules)
• Network services
• Virtual Private Network (VPN)
• Security features

Monitoring & basic troubleshooting:

• Reporting
• Live Log Analysis
• Fault diagnosis
• States & Tables
• Backup & Recovery

Appointments
December 2nd, 2026 from 9:00 AM to 5:00 PM 
December 3, 2026, from 9:00 AM to 5:00 PM 

certificate
All participants will receive an official certificate of participation from the manufacturer Deciso upon completion of the training.

What prior knowledge is required?
Basic Linux and networking knowledge is advantageous, but not absolutely necessary.

Would you like to get to know OPNsense® first?
In addition to practical training courses, our cooperation partner also offers free [information/programs] at regular intervals. Webinars all about OPNsense®. These formats are ideal for anyone looking for a compact introduction and wanting to gain an initial overview of the functions, applications, and advantages of the open-source firewall.

Lecturer
Julian Brewka has strengthened inett GmbH since 2024, bringing his international expertise in implementing global IT projects. After many years in the private sector, including stints in the USA, his current focus is on migration to open-source technologies. He has personally experienced the transition from VMware to Proxmox and from Sophos to OPNsense, and therefore understands the real challenges facing administrators and IT teams today. This practical knowledge makes his training courses particularly valuable for anyone aiming for a smooth infrastructure transition.