Using Advanced Network Configuration

SCM and the Siebel CRM environments you deploy on OCI use several subnets. Each subnet uses a range of IP host addresses. When you install SCM, for complete network IP range customization, you can specify to use Advanced Network Configuration.

If you choose this option, then you can specify the IP host address range for the SCM subnet and private subnet. Later, when you deploy Siebel CRM, you specify the minimum IP range for each subnet in this deployment's environment. The IP ranges are specified using CIDR notation.

You configure the SCM subnet and private subnet one time only, during SCM stack creation. This subnet applies in the compartment in which you installed SCM. See also Downloading and Installing Siebel Cloud Manager.
All other subnets apply per Siebel CRM environment, in the compartment for that environment. You specify these additional subnet CIDR ranges as payload parameters for the Siebel CRM deployment, as described in Parameters in Payload Content.

The default CIDR range values for the payload parameters below are those for VCN 10.0.0.0/16, SCM subnet 10.0.0.0/24, and private subnet 10.0.255.0/24 ranges. When using Advanced Network Configuration, specify different values as appropriate.
```
"infrastructure": {
  "siebel_lb_subnet_cidr": "10.0.1.0/24",
  "siebel_private_subnet_cidr": "10.0.2.0/24",
  "siebel_db_subnet_cidr": "10.0.3.0/24",
  "siebel_cluster_subnet_cidr": "10.0.4.0/24"
}
```

When giving Siebel CRM subnet IP ranges using Advanced Network Configuration, review the following information:

The minimum IP range required for one Siebel CRM environment is /26 for VCN, providing 64 IP host addresses. The minimum IP range required for each subnet is either /29 or /30, as shown in the following table. /29 provides eight host addresses and /30 provides four host addresses.
Note: In each subnet's CIDR range, the OCI Networking service reserves the first two addresses and the last address for use by Oracle. So, if a subnet requires one host address, then the minimum IP range for that subnet is /30. If a subnet requires two or more host addresses, then the minimum IP subnet range is /29. You must use a valid CIDR for each subnet's IP range.
Each subnet range must be inside the parent VCN IP range given.
In case of multiple Siebel CRM environments in the same SCM instance, you must use nonoverlapping IP ranges for each environment's subnets.

Subnets for SCM and Siebel CRM on OCI

Subnet	Usage	Minimum Subnet Range / Description
Cloud Manager subnet	SCM public endpoint	/30 SCM uses one host address in this subnet for its public end point.
Cloud Manager private subnet	SCM mount target	/29 SCM uses one host address in this subnet for a shared mount target resource.
siebel_lb_subnet_cidr	Load Balancer subnet	/29 The OCI Load Balancers use two host addresses in the subnet, one each for the primary and secondary load balancers.
siebel_private_subnet_cidr	Kubernetes worker nodes private subnet	/29 By default, SCM configures three Kubernetes nodes. Each Siebel CRM environment requires three host addresses in this private subnet for Kubernetes nodes.
siebel_db_subnet_cidr	Database private subnet	/30 A minimum of one host address is needed for the database private subnet for Autonomous Database (ATP) or Oracle Database Cloud Service (DBCS).
siebel_cluster_subnet_cidr	OKE cluster subnet (Kubernetes API server)	/30 A minimum of one host address is needed for the Kubernetes API Server.

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