FOR SALE: OPNsense eight-port Gigabit router/firewall on Sophos SG 125 rev 3 hardware.

Sophos SG 125 with stock firmware is out of support with the manufacturer effective March 31, 2025. To decouple the device from the manufacturer’s licensing and services, we installed and configured OPNsense, an open-source operating system for networking equipment.

To test the device and make port functions consistent with on-device labeling, we made a few changes to the initial OPNsense configuration. A detailed configuration note will be provided to the buyer. Alternatively, the buyer could simply reset OPNsense to its initial state.

The device runs on an Intel Atom C3508 processor with 4 GB of RAM and a 64 GB SSD. The processor supports AES-NI crypto and QAT crypto.

The device is implemented in a desktop form factor. The case is all metal and very sturdy. There are eight Gigabit Ethernet ports, four on an Intel x553 card and four on an Intel i211 card. There’s also a single SFP port serviced by an Intel i210 card; we confirmed that it works, but we cannot guarantee its compatibility with all SFP cartridges.

The device is actively cooled; under the normal conditions, noise level and pitch resemble those of a PC. There are two power connectors for redundant power supplies.

The device is in very good physical condition (please review the photos). A power supply unit (alas, only one!) is included.