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In this video, I want to give you a quick overview of networking and virtualization.

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Let's say that here we have your virtualization host.

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On this virtualization host, you have your network.

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Let's call it ETH0 for simplicity's sake, and ETH0 is connected to the network.

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Now on the virtual host, we have these different virtual machines, and let's say they are here,

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VM1, VM2, VM3, and so on.

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How are they going to get networked?

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Well, this is by using the virtual bridge.

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You normally have a virtual bridge device.

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There are different ways how this virtual bridge can be implemented, by the way.

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There is also OpenVSwitch as a virtual bridge on steroids, but that doesn't change the idea.

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What's going to happen is that the virtual bridge connects to the ETH0, and the ETH0 network card

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in your virtual machines, well, that is going to connect to the virtual bridge.

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And that makes that all these virtual machines can connect to one another.

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And as this virtual bridge is implementing network address translation technology,

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it also means that your virtual machines can go out.

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Now it's even going to be more interesting if there is another virtual host.

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Let me draw it real small.

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In this other virtual host, you might want to have some virtual machines as well.

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And these virtual machines might be between a virtual bridge also.

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Now what are you going to do to make sure that you have one big network between the virtual bridges

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on all these hosts?

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Well, that is where SDN is coming in, software-defined networking.

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It goes a little bit far for standalone virtualization, but if you create a virtualized data center,

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it's really important to join all these virtual bridges together in one software-defined network

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so that the virtual machines think that they're all on the same network.

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So virtual networking is all about the virtual bridge.

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You want to see it? Use IPA.

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And there we can see VRBR, VRBR0, and VRBR0, that is my virtual bridge.

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It has an INET interface, which creates the internal network for the virtual machines.

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And this bridge makes that through the regular ENS33, my virtual machines can go outside.