A network administrator wants to set up redundant IPsec VPN tunnels on FortiGate by using...

To configure redundant IPsec VPN tunnels on FortiGate with failover capability, the following two key configuration changes are required:

A. Enable Dead Peer Detection (DPD):Dead Peer Detection is crucial for detecting if the remote peer is unreachable. By enabling DPD, FortiGate can quickly detect a dead tunnel, ensuring a faster failover to the secondary tunnel when the primary tunnel goes down.

C. Configure a lower distance on the static route for the primary tunnel and a higher distance on the static route for the secondary tunnel:The static route with the lower distance (higher priority) will be used when both tunnels are operational. If the primary tunnel fails, the higher distance (lower priority) route for the secondary tunnel will take over, ensuring traffic is routed correctly.

The other options are not suitable:

B. Enable Auto-negotiate and Autokey Keep Alive on the phase 2 configuration of both tunnels:This option is not directly related to the requirements of failover between two IPsec VPN tunnels.

D. Configure a higher distance on the static route for the primary tunnel and a lower distance on the static route for the secondary tunnel:This would prioritize the secondary tunnel over the primary tunnel, which is opposite to the desired configuration.

References

FortiOS 7.4.1 Administration Guide -Configuring IPsec VPN, page 1320.

FortiOS 7.4.1 Administration Guide -Redundant VPN Configuration, page 1335.