Alternatively, you can choose manual address configuration, in which you configure the following:
One public address and host name for each node.
One VIP address for each node.
You must assign a VIP address to each node in the cluster. Each VIP address must be on the same subnet as the public IP address for the node and should be an address that is assigned a name in the DNS. Each VIP address must also be unused and unpingable from within the network before you install Oracle Clusterware.
Up to three SCAN addresses for the entire cluster.
Note:
The SCAN must resolve to at least one address on the public network. For high availability and scalability, Oracle recommends that you configure the SCAN to resolve to three addresses on the public network.
See Also:
Your platform-specific Oracle Grid Infrastructure Installation Guide installation documentation for information about system requirements and configuring network addresses