Deciso B.V.

OPNsense is an open-source, FreeBSD-based firewall and routing platform that provides enterprise-grade features including stateful packet inspection, traffic shaping, intrusion detection/prevention (via Suricata), VPN, web filtering, and two-factor authentication. It offers a modern web interface and regular security updates. 

OPNsense generates comprehensive logs covering firewall rule actions, intrusion detection alerts, web proxy access, VPN connections, DNS queries, and system events. As an open-source platform widely deployed in small-to-medium enterprises, its log data provides essential network security visibility including blocked connections, detected threats, and VPN access patterns.