OPnsense är firewall gratis också.
Detta kan Opnsense göra :
OPNsense Core Features
- Traffic Shaper
- Two-factor Authentication throughout the system
- Captive portal
- Forward Caching Proxy (transparent) with Blacklist support
- Virtual Private Network (site to site & road warrior, IPsec, OpenVPN & legacy PPTP support)
- High Availability & Hardware Failover ( with configuration synchronization & synchronized state tables)
- Intrusion Detection and Prevention
- Build-in reporting and monitoring tools including RRD Graphs
- Netflow Exporter
- Network Flow Monitoring
- Support for plugins
- DNS Server & DNS Forwarder
- DHCP Server and Relay
- Dynamic DNS
- Encrypted configuration backup to Google Drive
- Stateful inspection firewall
- Granular control over state table
- 802.1Q VLAN support
- and more.. see features
Finns mer här att läsa om det då https://opnsense.org/