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Floating IPs - An IP address that a project can associate with a VM so that the instance has the same public IP address each time that it boots. You create a pool of floating IP addresses and assign them to instances as they are launched to maintain a consistent IP address for maintaining DNS assignment.
Port - A virtual network port within Networking; VIFs / vNICs are connected to a port. CIDR Ingress - The process of filtering incoming network traffic. Supported by Compute.