Learn how to install OPNsense firewall, a fork of pfSense offering more frequent updates and open-source appeal. Explore hardware requirements, download necessary software, and follow step-by-step installation instructions. Discover the advantages of OPNsense, including its ZenArmor plugin for next-generation firewall capabilities. Get tips on changing default settings, disabling DNS server listening on WAN interface, and configuring DNS forwarding servers. Gain insights on hardware suggestions, software requirements for Windows users, and special considerations for VMware ESXi installations in this comprehensive 26-minute video tutorial.