What is required to create a site-to-site IPsec VPN on FortiGate?

To create a site-to-site IPsec VPN on FortiGate, it is essential to configure VPN settings, which include phase 1 and phase 2 configurations. Phase 1 settings establish the initial secure channel between the two VPN peers, encompassing parameters such as the IKE version, authentication method, encryption algorithms, and Diffie-Hellman group. Thus, the phase 1 settings are crucial for negotiating the secure connection.

Phase 2 settings manage the actual data traffic over the established tunnel, including the definitions of the IPsec selectors, encryption and authentication algorithms, and Perfect Forward Secrecy settings. These configurations ensure that the data packets traveling over the VPN are encrypted and secure.

Other choices do not address the complete requirements for setting up a site-to-site VPN. Router configurations may play a role in overall network design but are not specific to VPN setup on FortiGate devices. Static NAT settings could be relevant in certain contexts, but they are not mandatory for configuring a VPN. Similarly, having a username and password is only necessary for user VPN scenarios (such as remote access VPNs), and this information does not apply to establishing site-to-site connections. Therefore, comprehensive configurations for both phase 1 and phase 2 are crucial for successful