Im a novice at iptables, but still have a basic understanding of them.
Can anyone tell me some iptables commands that can literally prevent everything going in and out ?
ie close all ports and allow nothing else except my Whonix Gateway + Whonix Workstations traffic to pass through.
So basically the host would have no internet capabilities.
You could use something like corridor, or switch to macvtap + passthrough with kvm (I don’t know if there is something similar for virtualbox) or attach an usb-ethernet adapter to the VM.