IPsec tunnel template example

The following example demonstrates the IPsec template features with the following assumptions:

• All three FortiGates are added in FortiManager without prior configuration.

  • The branch FortiGates are added to a Branches device group. See Adding custom device groups.

  • The hub HQ device is added to a HUB device group.

• Each FortiGate uses port2 as the WAN and port4 as LAN.

  • These names are added as aliases.

• The WAN interface is configured as the default gateway (0.0.0.0/0) with a static route (you may use DHCP to receive the default route).

• Only the necessary policies for the VPN connections are specified.

  • Branch FortiGates use the Branches policy package.

  • HQ FortiGate uses the HUB policy package.

• Static routes are used to direct traffic over the VPN tunnels.

• Auto Discovery VPN (ADVPN) is not configured.

  • ADVPN may be enabled in the HUB_IPsec_Recommended or BRANCH_IPsec_Recommended recommended templates during activation, or it may be enabled in advanced settings after activation in any IPsec template.

  • See ADVPN in the FortiGate Administration Guide for more details.

• Policies only allow traffic from the branches to the hub.

  • You may wish to create policies in each Branch and HUB policy package to allow traffic from the hub to the branches.

• A meta field branch_id is used in the configuration. See Meta Fields.

  • The branch_id allows you to dynamically configure each branch’s LAN subnet as follows:

    • 192.168.branch_id.0 = 192.168.1.0, 192.168.2.0, and so on.

• Set branch_id meta field value for each branch

  • Branch-A: 1.

  • Branch-B: 2.

• The below topology outlines the connected networks for each FortiGate.

  

  Once configured, the overlay will look like the following topology.