should you’re working with libvirt or Virtualbox, this won’t work since the virtual NAT product has its have DHCP server which is able to get in the way in which. therefore you’ll must arrange Static IP addresses https://macktechbiz.com/blogs/news/unleashing-the-power-of-micro-appliance-pc-firewalls-a-revolution-in-open-source-firewall-solutions-with-zenarmor-and-opnsense-support