FortiGate IPSec VPN Tunnel Setup

Step 1: Access the Firewall GUI

1. Launch the firewall.
2. Enter the public IP address of the firewall in a web browser.
3. Login using the provided credentials:
   • Username: admin
   • Password: (Received via email)

Step 2: Create a New VPN Tunnel

1. Click on VPN Tunnels in the firewall dashboard.
2. Click Create New.
3. Select IPSec Tunnel from Template.
4. Enter a name for the tunnel (e.g., VPC Peering).
5. Click Begin.

Step 3: Configure IPSec Tunnel

1. Enter a Pre-shared Key (randomly generated). Example:
   4+w2vCVCAB7t6Po9hCwqA8dm
2. Ensure the same passkey is used for both firewalls.
3. Click Next.

Step 4: Configure Remote Firewall Settings

1. Enter the Public IP address of the remote firewall.
2. Update the VPC CIDR of the remote firewall.
3. Click Next.

Step 5: Configure Interface Settings

1. Set Outgoing Interface to port1.
2. Set Local Interface to port2.
3. Click Next.

Click on Next

It will show like below and click on submit

Step 6: Finalizing the Configuration

1. Click Submit.
2. You may receive a 500: Internal Server Error message.
   • Ignore this and click Submit again.
3. The firewall GUI may go down due to the tunnel using port 443.

Step 7: Change Firewall GUI Port

1. Login to the firewall CLI.

Execute the following command to change the GUI port to 444:
config system global
set admin-sport 444

2. end
3. Access the firewall GUI using the new port:

https://164.52.220.91:444/

Please check the firewall policy has been added like below

Step 8: Configure the Second Firewall

1. Repeat the same steps on the second FortiGate firewall:
   • Update the Remote Firewall IP.
   • Update the Remote VPC CIDR.
   • Change the GUI port to 444 using CLI.
   • Verify that the firewall policies have been added correctly.

Step 9: Verify Configuration

1. Ensure that both firewalls have the VPN tunnel established.
2. Check firewall policies to confirm that the VPC peering connection is configured properly.