No internet on very basic Debian

I am making an experiment with Debian, very basic Debian. I got the netinstall ISO and installed it in VirtualBox without any connection to the Internet, to see how basic it is and if I can dig myself out from it.

Well, I am stuck. I enabled Bridged connection in VirtualBox but super basic Debian can't see it. I also tried NAT. There is no ifconfig command, ifup is not working and nothing happens with 'service networking restart.'

How do I get networking running on super basic Debian?

TIA