For both conserving network resources and ensuring that network administrators understand the needs for networks and public IP addresses for providing access to the APIs and storage network as necessary, this section offers recommendations and required minimum sizes. Throughput of at least 1000 Mbps is suggested. This guide describes the following networks: A mandatory public network. Connects to the proxy server. A mandatory storage network. Not accessible from outside the cluster. All nodes connect to this network. An optional replication network. Not accessible from outside the cluster. Dedicated to replication traffic among storage nodes. Must be configured in the Ring. This figure shows the basic architecture for the public network, the storage network, and the optional replication network. By default, all of the OpenStack Object Storage services, as well as the rsync daemon on the storage nodes, are configured to listen on their STORAGE_LOCAL_NET IP addresses. If you configure a replication network in the Ring, the Account, Container and Object servers listen on both the STORAGE_LOCAL_NET and STORAGE_REPLICATION_NET IP addresses. The rsync daemon only listens on the STORAGE_REPLICATION_NET IP address. Public Network (Publicly routable IP range) Provides public IP accessibility to the API endpoints within the cloud infrastructure. Minimum size: one IP address for each proxy server. Storage Network (RFC1918 IP Range, not publicly routable) Manages all inter-server communications within the Object Storage infrastructure. Minimum size: one IP address for each storage node and proxy server. Recommended size: as above, with room for expansion to the largest your cluster size. For example, 255 or CIDR /24. Replication Network (RFC1918 IP Range, not publicly routable) Manages replication-related communications among storage servers within the Object Storage infrastructure. Recommended size: as for STORAGE_LOCAL_NET.