|Add an adapter|
|Windows 7 on Debian|
|Centos 7 on Ubuntu|
New NAT Network can be created in a following way
File → Preferences → Network → +
Preferences can be accessed by pressing CTRL + G
Got to Network
Click at the plus sign on the right. VirtualBox will create a network NatNetwork
By clicking plus sign again you can create new NAT networks they will use naming: NatNetwork1, NatNetwork2 …
To add an adapter to an existing machine you should Power Off it first.
Then open Settings → Network → Select the Adapter, e.g. Adapter 3 → Tick Enable Network Adapter box
Configure the Adapter
Export and import of VMs
To move VM from one computer to another you can open File → Export Appliance… (Ctrl+E) save .ova file, and move it to another computer, then open File → Import Appliance… (Ctrl+E) and select that .ova file.