The simplest network topology is created by configuring the Grid Network only.
When you configure the Grid Network, you establish the host IP address, subnet mask, and Gateway IP address for the eth0 interface for each grid node.
During configuration, you create a list of subnets called the Grid Network Subnet List (GNSL). This list contains the list of subnets in the Grid Network and the external subnets interfacing to the Grid Network. At installation, the Grid Network interface auto-generates static routing tables for all subnets in the GNSL and adds a default route if the Grid Network has a gateway and there is no Client Network.
In this example, all grid traffic shares the same network, including traffic related to S3 and Swift client requests, object management operations, and administrative functions.