Many vendors provide physical and virtual appliances that can build IPSec tunnels. Although these products support standard IPSec tunnels,there is some incompatibility among the different vendors. This document provides best practices for how to connect your on-premises network to Oracle Cloud Infrastructure with the most success by using an IPSec VPN over the internet. It assumes that you are familiar with routing protocols and concepts, IPSec VPN technology and configuration, and Oracle Cloud Infrastructure concepts and components. This document also includes simple, redundant, and complex use cases to help you deploy various IPSec VPN solutions. It doesn’t provide step-by-step instructions, but it does provide references to Oracle Cloud documentation. This document is vendor independent.
For full description review the IPSec VPN Best Practices white paper.