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 Network Connectivity for Physical Hosts

A standard Quantum setup has up to four distinct physical data center networks:

  • Management network. Used for internal communication between OpenStack Components.   The IP addresses on this network should be reachable only within the data center. 

  • Data network. Used for VM data communication within the cloud deployment.  The IP addressing requirements of this network depend on the Quantum plugin in use. 

  • External network. Used to provide VMs with Internet access in some deployment scenarios.  The IP addresses on this network should be reachable by anyone on the Internet. 

  • API network. Exposes all OpenStack APIs, including the Quantum API, to tenants. The IP addresses on this network should be reachable by anyone on the Internet. This may be the same network as the external network, as it is possible to create a quantum subnet for the external network that uses IP allocation ranges to use only less than the full range of IP addresses in an IP block.

[Note]Note

If the Nova metadata service is being used, any address space used on tenant networks must be routable on both the API network and on the External network, since the host running nova-api must be able to reply to HTTP requests with the un-SNATed IP address of a VM.



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