This image shows the east-west traffic flow from the web or application to OCI
Object Storage and other Oracle Services Network in a regional hub and spoke topology
that uses a VM Series firewall. It includes two virtual cloud networks (VCNs):
- Hub VCN (192.168.0.0/16): The hub VCN houses the VM Series firewall and internal network load balancer. The trust subnet uses vNIC2 for internal traffic to or from the VM Series firewall. This interface is part of the backend of the internal network load balancer. The hub VCN communicates with spoke VCNs through a dynamic routing gateway (DRG). The hub VCN communicates with OCI Object Storage through a service gateway.
- Web or application tier spoke VCN (10.0.0.0/24): The VCN contains a single subnet. A load balancer manages traffic to the web or application VMs. The application tier VCN is connected to the hub VCN over the DRG.
- Traffic that moves from the web or application tier to Object Storage is routed through the web or application subnet route table (destination 0.0.0.0/0).
- Traffic moves from the web or application subnet route table to the DRG for the Object Storage traffic.
- Traffic moves from the DRG through the hub VCN ingress route table to the VM Series firewall in the trust subnet over vNIC2 through the internal network load balancer. Depending on the different backend of the load balancer, it goes through one of the VM Series firewalls.
- Traffic from the VM Series firewall is routed through the trust subnet route table (destination Oracle Network Services). The firewall performs a source translation on the incoming packet to ensure that it uses the trust interface private IP address as the source translation object, so the service gateway sees traffic coming from the trust interface of the firewalls.
- Traffic moves from the trust subnet route table to the service gateway.
- Traffic moves from the service gateway to Oracle Services Network, such as OCI Object Storage.