In this tutorial you will learn how to install OPNSENSE 21.7 NOBBLE NIGHTINGALE on oracle VM virtualbox 6.1 in just about 10 minutes or less. OPNsense is an open source, FreeBSD-based firewall and routing software developed by Deciso, a company in the Netherlands that makes hardware and sells support packages for OPNsense. It is a fork of pfSense, which in turn was forked from m0n0wall, which was built on FreeBSD It allows you to protect and enhance your network through features such as: Traffic Shaper Two-Factor Authentication Captive portal Forward Caching Proxy (transparent) with Blacklist support Virtual Private Network (site to site & road warrior) High Availability & Hardware Failover Intrusion Detection and Prevention Build-in reporting and monitoring tools including RRD Graphs Netflow Export & Analysis 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.