...
Addresses can be static (persistent) or ephemeral (onnon-persistent):
- Ephemeral external IP addresses:
- For VM instances, the ephemeral external IP address is also released if you stop the instance. After you restart the instance, it is assigned a new ephemeral external IP address.
- Static external IP addresses:
- Static external IP address can be reserved and thereby assigned a project indefinitely until they are explicitly released. You can reserve a new static external IP address or promote an existing ephemeral external IP address to a static external IP address.
- Ephemeral internal IP addresses:
- Ephemeral internal IP addresses remain attached to VM instances until the instance is deleted.
- Static internal IP addresses:
- For VM instances, static internal IP addresses remain attached to stopped instances until they are removed.
...