If you are installing or importing virtual machines on whatever the platform you use (eg - Virtualbox, VMware) you might have wondered what are those networking options you find under network adapter settings. Well in most of the times you just switch from one to another until it gives you the output you expect. But it will be useful and come in handy if you know what they actually do and why those options are there.
In virtual box you will find this under options -> network
As you can see there are 6 options without not attached option.
Let's see why these guys are there.
1. NAT (Network Address Translation)
You can use this mode if you use your virtual machine to access internet, send emails and download files.
2. NAT Network
This is the newer version of NAT the Virualbox came up with. You will find this option on virtualbox version 4.3 onwards.
3. Bridged Adapter
This is considered as the advanced option among others. If your virtual machine runs any server you can use bridge network.
4. Internal Network
This can be used to create a different kind of software-based network which is visible to selected virtual machines, but not to applications running on the host or to the outside world.
5. Host-only Adapter
This can be used to create a network containing the host and a set of virtual machines, without the need for the host's physical network interface. Instead, a virtual network interface (similar to a loopback interface) is created on the host, providing connectivity among virtual machines and the host.
6. Generic Driver
This can be used if you want to interconnect two different virtual machines running on different hosts directly, easily and transparently, over existing network infrastructure.
7. Not attached
VirtualBox reports to the guest that a network card is present, but that there is no connection.
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