Basic Scenarios with a Single VCN
Here are a few basic networking scenarios to help you understand the Networking service and generally how the components work together.
Advanced Scenarios with Transit Routing Through a Single VCN
Scenarios A–C show your on-premises network connected to a VCN by way of FastConnect or VPN Connect, and accessing only the resources in that VCN.
The following advanced routing scenarios give your on-premises network additional access beyond the resources in the connected VCN. Traffic travels from your on-premises network to the VCN, and then transits through the VCN to its destination. See these topics:
Advanced Scenario with Multiple DRGs and Multiple VCNs
There's an additional advanced scenario that illustrates the use of multiple VCNs. In this case, each VCN has its own dynamic routing gateway (DRG) and its own FastConnect private virtual circuit . Contrast this with Transit Routing: Access to Multiple VCNs in the Same Region, in which there's a single DRG with either VPN Connect or a single FastConnect private virtual circuit.
Here are some restrictions for using the scenario that has multiple DRGs:
See FastConnect with Multiple DRGs and VCNs.