A second (bridged) network would then connect the web server to the outside world to serve data to, but the outside world cannot connect to the database. For example, one virtual machine may contain a web server and a second one a database, and since they are intended to talk to each other, the appliance can instruct VirtualBox to set up a host-only network for the two.
Host-only networking is particularly useful for preconfigured virtual appliances, where multiple virtual machines are shipped together and designed to cooperate. And whereas with internal networking, the traffic between the virtual machines cannot be seen, the traffic on the “loopback” interface on the host can be intercepted. In other words, whereas with bridged networking an existing physical interface is used to attach virtual machines to, with host-only networking a new “loopback” interface is created on the host.
Instead, when host-only networking is used, VirtualBox creates a new software interface on the host which then appears next to your existing network interfaces. Similarly, as with internal networking however, a physical networking interface need not be present, and the virtual machines cannot talk to the world outside the host since they are not connected to a physical networking interface. It can be thought of as a hybrid between the bridged and internal networking modes: as with bridged networking, the virtual machines can talk to each other and the host as if they were connected through a physical Ethernet switch. Host-Only: Host-only networking is another networking mode that was added with version 2.2 of VirtualBox.
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