6.5 Introduction to Host Interface Networking (HIF)
With Host Interface Networking, VirtualBox creates a new networking interface in software on the host computer. This new software interface will then exist in parallel to your regular interfaces (e.g., on a Linux host vbox0 will exist alongside eth0). When a guest is using such a new software interface, it looks to the host system as though the guest were physically connected to the interface using a network cable: the host can send data to the guest through that interface and receive data from it. This means that you can set up routing or bridging between the guest and the rest of your network.
Network bridging is one of the simplest ways to use Host Interface Networking. Bridging allows you to connect several network devices together in software, so that data sent to one of the devices will be sent to all of them. For our purposes, this means that virtual machines can send packages through the host’s network card, using their own network hardware address, and receive packages sent to it. Other computers on your network will see your guests as though they were physically connected to the network. You will need wired (Ethernet) network hardware on the host for this as most current wireless network devices do not support bridging.
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