Oracle OCI Site-to-Site VPN to Meraki Switch – Part 2

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We have started the workshop in the previous blog “Oracle OCI Site-to-Site VPN to Meraki Switch – Part 2” where we covered the steps to create DRG, a private subnet, and a security list.

In this blog, we will complete the workshop by creating a Site-to-Site VPN configuration and then configuring the Meraki Cisco switch.

 

Step #6: Create Site-to-Site VPN

We will use the wizard to set up a Site-to-Site VPN. The wizard sets up a Site-to-Site VPN between your on-premises network and your Oracle VCN. That includes the IPSec encrypted tunnels and customer-premises equipment (CPE).

 

1. Open the navigation menu, click “Networking”, and then click “Site-to-Site VPN

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2. Click “Start VPN wizard”.

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3. In the “Create Site-to-Site VPN” dialog window, in the “Basic information” window select VCN’s compartment and VCN name, then click next. DRG and IGW will be automatically populated.

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In the “Subnets and security” window, select the “Select existing security list” option, and click “Choose subnets” to select a private subnet.

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In the “Choose subnets” dialog window, select private subnet, and click “Choose subnets”

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Make sure to select the correct Security list created in step #4 from the previous blog.

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In the “Site-to-Site VPN” window, enter and select the below options then click “Next”

  • VPN Name
  • Routing Type: Policy-based routing
  • Routes to your on-premises network: In our example, 10.8.8.0/24

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In the “Tunnel 1 & 2 information” section select the below options

  • IKE Version: IKEv1
  • On-premises network CIDR blocks: In our example, 10.8.8.0/24
  • On-premises cloud CIDR blocks (this is on OCI): In our example, 172.40.40.0/24

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In the “CPE” window, enter and select the below information, and click “Next”

  • CPE Name
  • IP Address: The public IP address of your CPE device. In this example, 142.35.140.32
  • Vendor: Other

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In the “Review and Create” window, click “Create VPN solution” at the bottom. Once provisioning completes VPN state will be available.

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4. Click the VPN name to collect tunnel information. The below information is required to configure the on-premises Meraki switch.

Note: You will notice that there are two IPSec Tunnels from Oracle’s side. Meraki only supports connecting to one at a time.

– Tunnel 1 public IP address – Oracle VPN IP address

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– Tunnel 1 shared secret

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– Phase details: click on Tunnel 1 name then navigate to the “Phase details” tab. Required information

  • Lifetime in seconds
  • Diffie-Hellman group
  • Diffie-Hellman group

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Step #7: Configure Cisco Meraki Switch

Note: You will notice that there are two IPSec Tunnels from Oracle’s side. Meraki only supports connecting to one at a time.

  1. Open the Meraki Dashboard
  2. Navigate to the Site-to-Site VPN settings page (Security & SD-WAN, Site-to-site VPN
  3. Select Hub (Mesh) as the type
  4. Enable the VPN “only for subnets listed in your IPSec connection” — having one too few or one too many will cause the entire connection to fail
  5. Add a Non-Meraki VPN Peer
  • Give it a name
  • Set the Public IP to the Public IP of Oracle VPN tunnel 1
  • Leave Remote ID blank
  • Set Private subnets to the Oracle VCN’s private subnet CIDR Block. In our example, 172.40.40.0/24
  • Set IPSec policies to custom and follow the configuration below. Use the OCI tunnel’s phase information collected in step #6
  • Fill in your OCI Tunnel “shared secret” collected in step #6
  • Set Availability to all networks

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Step #8: Test connection

Once the Meraki switch configuration is completed Oracle tunnel status will be up

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We’re all done provisioning, and you should now be able to ping and SSH from on-premises to the Oracle compute instance located in the private subnet.

You can access VPN logs as shown below.

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The workshop is completed. IPSec VPN connection between your on-premises and Oracle VCN private subnet is ready now!

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