I would like to have a VirtualBox virtual machine that can't get online. I want to be able to monitor all network traffic attempts from the Linux host.
So, if the virtual machine attempts to make a SYN out to a random IP (that it can't route to) the Linux host will be able to see this traffic with tcpdump running. I believe I will need to setup some type of forwarding rules with IPtables.
Has anyone accomplished this?