Using the physical network adapter of the real computer, we will connect the VM to the local network with its corresponding MAC address, or it will obtain an IP address from the DHCP server that we have on the local network, and not from the VirtualBox DHCP server.
In this configuration mode, the virtual machine becomes one more computer within the home or professional local network. It is absolutely necessary to forward TCP and/or UDP ports to be able to establish communication from “outside” (local network) to “inside” (virtual machine), and even if you want to communicate, the host itself must do a port forwarding. If we want to mount a network service in the VM such as an SSH or FTP server among others, we must click on the “Port Forwarding” option, this option is found in the “ Network” section when we select the type of network to NAT. If a computer on the local network wants to communicate with the virtual machine that is running, it will not be able to do so directly because we are working in a NAT scenario. In this configuration mode, the virtual machine can communicate with any computer on the home or professional local network that the real PC can reach, it can also have Internet connectivity if the real PC has connectivity.
When we are in a NAT configuration, the virtual machine will go out to the local home network and to the Internet using the private IP address of the real computer, therefore, it is as if the real computer were exchanging traffic, since NAT is done on the address Real private IP of the computer in question. In this configuration mode, the VM will obtain a private IP address from a subnet defined by VirtualBox itself.
This configuration mode is the default on all VirtualBox virtual machines. Now that we know the main configurations at the network level that we can carry out in a virtual machine with VirtualBox, we are going to explain in detail how each of these options works.
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