IP addresses

1. IP addresses

Now that we covered Google Cloud Networks at a high level, let's go deeper by exploring IP addresses. In Google Cloud, each virtual machine can have two IP addresses assigned. One of them is an internal IP address, which is going to be assigned via DHCP internally. Every VM that starts up and any service that depends on virtual machines gets an internal IP address. Examples of such services are App Engine and Google Kubernetes Engine, which are explored in other courses. When you create a VM in Google Cloud, its symbolic name is registered with an internal DNS service that translates the name to the internal IP address. DNS is scoped to the network, so it can translate web URLs and VM names of hosts in the same network, but it can't translate host names from VMs in a different network. The other IP address is the external IP address, but this one is optional. You can assign an external IP address if your device or your machine is externally facing. That external IP address can be assigned from a pool, making it ephemeral, or it can be assigned a reserved external IP address, making it static. If you reserve a static external IP address and do not assign it to a resource, such as a VM instance or a forwarding rule, you are charged at a higher rate than for static and ephemeral external IP addresses that are in use. You can use your own publicly routable IP address prefixes as Google Cloud external IP addresses and advertise them on the Internet. In order to be eligible, you must own and bring a /24 block or larger.

2. Let's practice!

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