DEC3862 from Deciso – The high-performance firewall appliance for professional networks
8. May 2025 OPNsense

At a time when cyber threats are becoming more sophisticated and network requirements more complex, the need for powerful, reliable and scalable security solutions is increasing. Deciso provides an answer to these requirements with its OPNsense®-based security appliance DEC3862. This high-end device combines advanced hardware with the flexibility and transparency of open source software and is therefore aimed in particular at medium-sized to large companies, public authorities or educational institutions with high demands on performance, security and scalability.

What is the DEC3862?

The DEC3862 is a 1U rackmount security appliance based on the popular OPNsense® open source firewall platform. Deciso, the manufacturer behind the project, is known for high-quality appliances that are specifically tailored to the requirements of network security.

With a powerful AMD EPYC™ embedded processor, 32 GB DDR4 RAM and a fast 512 GB M.2 SSD for storage operations, the DEC3862 is designed for maximum performance and reliability. It is ideal for complex network topologies, intensive VPN use or environments with high data traffic.

Technical highlights at a glance

The DEC3862 impresses with a wide range of impressive specifications:

  • Processor: AMD EPYC™ Embedded, 8 cores, up to 3.1 GHz
  • RAM: 32 GB DDR4
  • Memory: 512 GB M.2 SSD
  • Network connections:
    • 4x 2.5 Gigabit Ethernet (RJ45)
    • 2x 10 Gigabit SFP+
  • Firewall throughput: Up to 17.4 Gbps
  • IPsec VPN throughput: 2.5 Gbps (AES256-GCM)
  • Maximum simultaneous sessions: 31 million
  • Dimensions: 1U, 19″ rackmount, 43.65 mm height
  • Operating temperature: 0 to 50 °C

The combination of 2.5 GbE and 10 GbE connections allows flexible integration into existing network structures – from classic copper lines to modern fiber optic connections.

DEC3862 from Deciso – The high-performance firewall appliance for professional networks

Ideal for demanding applications

The DEC3862 was specially developed for advanced security applications and environments with high network loads. Whether as a firewall, VPN gateway, intrusion prevention system (IPS) or web proxy – the appliance offers enough resources and performance reserves for intensive workloads. Integration with Zenarmor (formerly Sensei) for deep packet inspection is also possible without any problems and without impairing system performance.

By using OPNsense®, you get a modern, clear web interface, regular updates and a wide range of expansion options – from dynamic routing to 2-factor authentication for secure remote access.

Application scenarios and target groups

The DEC3862 is not only aimed at traditional data centers, but also at:

  • Medium-sized companies that work with scalable data traffic and many simultaneous connections.
  • Public institutions that prefer a cost-effective yet powerful solution with open source transparency.
  • IT system houses and managed service providers (MSPs) who want to offer their customers flexible security solutions.
  • Research institutions that cannot compromise on network security.

Software: OPNsense® – more than just open source

The OPNsense® firewall distribution pre-installed on the DEC3862 is not only free and open source, but is also actively developed further. The operating system is based on FreeBSD and offers a strong combination of stability, security and expandability.

The OPNsense Business Edition is also included free of charge for one year – ideal for professional environments that want to benefit from LTS updates, centralized management and advanced features.

The Business Edition features a commercial firmware repository, an official Open Virtualization Image (OVA) and an integrated GeoIP database. Users also get access to professional plugins and a free e-book in German and English.

Our conclusion:

With the DEC3862, Deciso has created a powerful and future-proof firewall appliance that can be seamlessly integrated into modern network infrastructures. The combination of powerful hardware, flexible network connectivity and the open OPNsense ecosystem makes the device an excellent choice for companies that rely on high security, transparency and control.

Anyone looking for a scalable, stable and user-friendly security solution is sure to find what they are looking for with the DEC3862.

DEC3862 from Deciso – The high-performance firewall appliance for professional networks

A great performer with AMD EPYC™ performance in a rack-mountable chassis.
This model includes 32GB DDR4 RAM, 512GB M.2. solid state flash and can handle up to 17.4Gbps firewall & 2.5Gbps IPsec throughput.