Connecting your Oracle Virtual Private Cloud (VPC) with your OVH Virtual Private Cloud (VPC) allows secure communication between resources across both cloud environments. This article guides you through configuring a secure IPSec VPN tunnel to facilitate this communication.
Prerequisites:
- An active Oracle Cloud Infrastructure (OCI) account with administrative privileges.
- An active OVHcloud account with administrative privileges.
- A public IP address for a virtual machine (VM) in each VPC that will act as the VPN endpoint.
Choosing a VPN Solution:
There are two primary approaches for creating the VPN tunnel:
- Managed VPN Service (Recommended): Both OCI and OVHcloud offer managed VPN services. These services simplify configuration and management, making them ideal for most users. However, they may incur additional charges.
- IPSec Site-to-Site VPN: This method utilizes open-source software like Libreswan on VMs within each VPC. While offering more granular control, it requires a deeper understanding of VPN configurations.
This article focuses on the IPSec Site-to-Site VPN approach due to its flexibility.
Configuration Steps:
Prepare the VPCs:
- In both OCI and OVHcloud, define the subnets within your VPCs that will communicate through the VPN tunnel. Note down the CIDR blocks for these subnets.
- Create security lists (Oracle) or firewall rules (OVHcloud) for the VPN endpoint VMs. Allow inbound traffic on ports UDP 500 and ESP (Encapsulating Security Payload) protocol for secure communication.
Set Up Customer Gateways:
- In OCI, navigate to the Virtual Network Cloud Service (VNC) console and create a Customer Gateway (CGW). Provide a name and the public IP address of the OVHcloud VPN endpoint VM.
- Perform a similar step in OVHcloud, creating a dedicated internet link or a VPN connection depending on your configuration. Specify the public IP address of the OCI VPN endpoint VM.
Configure IPSec on VPN Endpoints:
- Install Libreswan or a similar IPSec software on the VPN endpoint VMs in both OCI and OVHcloud.
- Configure IPSec on each VM, specifying details like:
- Local and remote endpoints (public IP addresses of the counterpart VM).
- Preshared Key (PSK) for authentication (ensure a strong, unique key).
- Encryption and hashing algorithms (e.g., AES-256 for encryption, SHA-512 for hashing).
- Local and remote subnet CIDR blocks for routing traffic.
Establish the VPN Tunnel:
- Initiate the IPSec connection from one of the VPN endpoint VMs. The specific commands will vary depending on the chosen software.
- Verify the connection status using commands like
ipsec statuson Linux. Ensure both ends show a successful "ESTABLISHED" status.
Route Traffic:
- Configure routing tables on both OCI and OVHcloud to direct traffic destined for the remote VPC subnet through the VPN tunnel interface.
Testing and Verification:
- Once the VPN tunnel is established, ping a resource in the remote VPC from a resource in your local VPC. A successful ping confirms connectivity.
- You can also test by establishing SSH connections or transferring files between resources across the VPCs.
Additional Considerations:
- Implement strong security practices like using a complex PSK and keeping the IPSec software updated.
- Monitor the VPN tunnel health for any disruptions and troubleshoot promptly.
- Consider using a high availability (HA) configuration for redundancy by setting up multiple VPN tunnels with different endpoint VMs.
Conclusion:
By following these steps, you can establish a secure VPN tunnel between your Oracle VPC and OVH VPC. This connection enables secure communication and resource access between your cloud environments, fostering a hybrid cloud architecture. Remember to adapt these steps based on the specific chosen software and cloud provider configurations. For more detailed instructions, refer to the official documentation for OCI VNC, OVHcloud networking, and your chosen IPSec software.
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