IP addresses

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Many Google Cloud resources can have internal IP addresses and external IP addresses. For example, you can assign an internal and external IP address to Compute Engine virtual machine (VM) instances. Instances use these addresses to communicate with other Google Cloud resources and external systems.

Each VM instance network interface must have one primary internal IPv4 address. Each network interface can also have one or more alias IPv4 ranges, and one external IPv4 address. If the VM is connected to a subnet that supports IPv6, each network interface can also have internal or external IPv6 addresses assigned.

An instance can communicate with instances on the same Virtual Private Cloud (VPC) network, using the VM's internal IPv4 address. If the VMs have IPv6 configured, you can also use one of the VM's internal or external IPv6 addresses. As a best practice, use internal IPv6 addresses for internal communication.

To communicate with the internet, you can use an external IPv4 or external IPv6 address configured on the instance. If no external address is configured on the instance, Cloud NAT can be used for IPv4 traffic.

For information about identifying the internal and external IP address for your instances, see Locating the external and internal IP address for an instance.

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External IPv4 and IPv6 addresses

You can assign an external IPv4 or IPv6 address to an instance if you need to communicate with the internet, or with resources in another VPC network. Sources from outside a VPC network can reach a specific resource using its external IP address, if firewall rules or hierarchical firewall policies allow the connection. Only resources with an external IP address can directly communicate with resources outside of the VPC network. Communicating with a resource using an external IP address can cause additional billed charges.

Internal IPv4 and IPv6 addresses

VM interfaces are assigned IP addresses from the subnet that they are connected to. Each VM interface has one primary internal IPv4 address, which is assigned from the subnet's primary IPv4 range. If the subnet has an internal IPv6 range, the VM interface can optionally be configured with an internal IPv6 address.

Instances can also have alias IP addresses and ranges. If you have more than one service running on a VM, you can assign each service its own unique IP address.

Internal DNS names

Google Cloud automatically resolves the fully qualified DNS name (FQDN) of an instance to the internal IP addresses of the instance. Internal DNS names work only within the instance's VPC network.

For more information about fully qualified domain names (FQDN), see Internal DNS.

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