Fortinet FortiGate BOVPN Integration Guide

Deployment Overview

WatchGuard provides integration instructions to help our customers configure WatchGuard products to work with products created by other organizations. If you need more information or technical support about how to configure a third-party product, see the documentation and support resources for that product.

This integration guide describes how to configure a Branch Office VPN (BOVPN) tunnel between a WatchGuard Firebox and a Fortinet FortiGate 60E.

Integration Summary

The hardware and software used in this guide include:

  • WatchGuard T55-W
    • Fireware v12.5.2 or higher
  • Fortinet FortiGate 60E
    • FortiOS v6.2.0 or higher

Topology

This diagram shows the topology for a BOVPN connection between a Firebox and a Fortinet FortiGate 60E.

WatchGuard Firebox and Fortinet topology diagram

Configure the Firebox

On the Firebox, configure a BOVPN connection:

  1. Log in to Fireware Web UI.
  2. Select VPN > Branch Office VPN.
    The Branch Office VPN configuration page appears.
  3. In the Gateways section, click Add.
  4. In the Gateway Name text box, type a name to identify this Branch Office VPN gateway.
  5. From the Address Family drop-down list, select IPv4 Addresses.
  6. In the Credential Method section, select Use Pre-Shared Key.
  7. In the adjacent text box, type the pre-shared key.

Screen shot of the General Settings tab

  1. In the Gateway Endpoint section, click Add.
    The Gateway Endpoint Settings dialog box appears.
  2. From the External Interface drop-down list, select External.
  3. From the Interface IP Address drop-down list, select Primary Interface IPv4 Address.
    The Primary Interface IP Address is the primary IP address you configured on the selected external interface.
  4. Select By IP Address.
  5. In adjacent text box, type the primary IP address of the External Firebox interface.

Screen shot of the Local Gateway tab

  1. Select the Remote Gateway tab.
  2. Select Static IP Address.
  3. In the adjacent text box, type the IP address of your Fortinet WAN connection.
  4. Select By IP Address.
  5. In the adjacent text box, type the IP address of your Fortinet WAN connection.
  6. Keep the default settings for all other options.

Screen shot of the Remote Gateway tab

  1. Click OK.
  2. In the Gateway Endpoint section, select the Start Phase 1 tunnel when Firebox starts check box.

Screen shot of the completed General Settings

  1. Select the Phase 1 Settings tab.
  2. From the Version drop-down list, select IKEv2.
  3. Keep all other Phase 1 settings as the default values.

Screen shot of the Phase 1 settings

  1. Click Save.
  2. In the Tunnels section, click Add.

Screen shot of the Gateways list

  1. From the Gateway drop-down list, select gateway.1.
  2. In the Addresses section, click Add.

Screen shot of the Addresses tab

  1. In the Local IP section, from the Choose Type drop-down list, select Network IPv4.
  2. In the Network IP text box, type the local IP segment. This IP address is the internal network that the VPN protects.
  3. In the Remote IP section, from the Choose Type drop-down list, select Network IPv4.
  4. In the Network IP text box, type the remote IP segment. This IP address is the internal network that the VPN protects.

Screen shot of the Addresses tab

  1. Click OK.
  2. Keep the default Phase 2 Settings.

Scren shot of the Phase 2 settings

  1. Click Save.

Configure the FortiGate 60E

Follow these steps to configure the interfaces, VPN settings, policies, and routes on your FortiGate device.

Interface Settings

  1. Log in to the FortiGate 60E Web UI at https://<IP address of FortiGate 60E>. The default IP address is 192.168.1.99.
  2. Select Network > Interfaces.
  3. Configure the external interface (wan1) and the internal interface (internal2). For information about how to configure interfaces, see the Fortinet User Guide.

Screen shot of the Fortinet interfaces

Enable Policy-based VPN

  1. Select System > Feature Visibility.
  2. Enable Policy-based IPsec VPN under Additional Features.
  3. Click Apply.

Screenshot of the Fortinet interfaces

IPSec VPN Tunnels Settings

  1. Select VPN > IPsec Tunnels.

Screen shot of the Fortinet IPsec tunnels

  1. Click Create New.
  2. In the Name text box, type the object name. In our example, the name is peer.
  3. Select Custom (No Template).

Screen shot of the Fortigate VPN creation wizard

  1. Click Next.
  2. Clear the Enable IPsec Interface Modecheck box.
  3. From the Remote Gateway drop-down list, select Static IP Address.
  4. In the IP Address text box, type the public IP address of the Firebox. In our example, the IP address is 203.0.113.2.
  5. From the Interface drop-down list, select wan1. Leave the default value for all other settings in the Network section.

Screen shot of the Fortigate network configuration

  1. In the Authentication section, from the Method drop-down list, select Pre-shared Key.
  2. In the Pre-shared Key text box, type the pre-shared key.
  3. In the IKE section, for Version, select 2.

Screen shot of the Fortigate New VPN Tunnel settings

  1. In the Phase 1 Proposal section, remove all proposals except AES256 for encryption and SHA256 for authentication.
  2. For the Diffie-Hellman Groups, select 14. Clear all other check boxes.
  3. Leave the default value for all other Phase 1 settings.

Screen shot of the Fortigate Phase 1 proposal

  1. In the Phase 2 Selectors section, from the Local Address drop-down list, select Subnet. Type the local IP segment. This IP address is the internal network that the VPN protects.
  2. From the Remote Address drop-down list, select Subnet. Type the remote IP segment. This IP address is the internal network that the VPN protects.
  3. Expand Advanced.
  4. Remove all proposals except AES256 for encryption and SHA256 for authentication.
  5. Enable Enable Replay Detection.
  6. Enable Enable Perfect Forward Secrecy (PFS)
  7. For the Diffie-Hellman Groups, check 14. Clear all other check boxes.
  8. Leave the default value for all other Phase 2 selectors.

Screen shot of Fortigate Phase 2 selectors

Screen shot of the Fortigate Phase 2 proposal 2

  1. Click OK.

Screen shot of the Fortigate IPSec tunnels configuration

Policy Settings

  1. Select Policy & Objects > Addresses.

Screen shot of the Fortinet Addresses settings

  1. Click Create New > Address.
  2. In the Name text box, type a name for the IP address. In our example, the name is WatchGuard_INT.
  3. From the Type drop-down list, select Subnet.
  4. In the IP/Netmask text box, type the IP segment.
  5. Leave the default value for all other settings.

Scree nshot of the Fortinet New Address dialog box

  1. Click OK.
  2. Repeat steps 1–7 to create another IP segment.

Screenshot of the Fortinet, Policy & Object, Addresses dialog box

  1. Select Policy & Objects > IPv4 Policy.

Screen shot of the Fortinet IPv4 policy

  1. Click Create New.
  2. In the Name text book, type the object name. In our example, the name is policy1.
  3. From the Incoming Interface drop-down list, select internal2.
  4. From the Outgoing Interface drop-down list, select wan1.
  5. From the Source Address drop-down list, select FortiGate 60E_INT.
  6. From the Destination Address drop-down list, select WatchGuard_INT.
  7. From the Schedule drop-down list, select always.
  8. From the Service drop-down list, select All.
  9. From the Action drop-down list, select IPsec.
  10. From the VPN Tunnel drop-down list, select peer.
  11. Enable Allow traffic to be initiated from the remote site.
  12. Leave the default value for all other settings.

Screen shot of the Fortinet New Policy settings

Screen shot of the Fortinet New Policy settings

  1. Click OK.
    The polices that you created appear on this page.

Screen shot of the Fortinet IPv4 Policy settings

Route Settings

  1. From the navigation menu, select Network > Static Routes.

Screen shot of the Fortinet Static Routes settings

  1. Click Create New.
  2. In the Destination > Subnet text box, type 0.0.0.0/0.0.0.0.
  3. From the Interface drop-down list, select wan1.
  4. In the Gateway Address text box, type your wan1 port gateway.
  5. Leave the default value for all other settings.

Screen shot of the Fortinet New Static Route settings

  1. Click OK.

Screen shot of the Fortinet Static Routes settings

Test the Integration

To test the integration, from Fireware Web UI:

  1. Select System Status > VPN Statistics.
  2. Verify that the VPN tunnel is active.

To test the integration, from the FortiGate Web UI:

  1. Select Monitor > IPsec Monitor.
  2. Verify that the VPN tunnel is active.

Finally, verify that the servers at Host1 and Host2 can successfully ping each other.