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Getting Started with Oracle VM VirtualBox by Pradyumna Dash

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Internal networking

If you want to keep one or more guest VMs in an internal network or isolated network, then this mode is the most suitable one. In this mode, VirtualBox ensures that all traffic on the network stays within the host and is only visible to the guest VMs on that virtual network. The network is shown in the following figure. This mode is similar to bridged networking, apart from the fact that it's secured compared to the bridged mode, because in the bridged mode all the traffic passes through the same physical interface of the host system. This mode is great if you have a requirement to keep two or more guest VMs on the same machine and only communicate with each other, or even hide their data from the host system where it's running ...

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