Question 150
The R82 gateway is configured for a third-party IPsec peer using a pre-shared secret. Both ends agree on IKE version and algorithms, but logs show authentication failure after the partner rotated its shared key. Which peer setting must be reconciled?
Explanation
Correct Answer
Set matching pre-shared keys on the two interoperable VPN peers so IKE authentication can complete.
Incorrect Answers
Switching to certificate authentication changes the trust model and is not the chosen pre-shared-key setup.
General IKE diagnostics help identify the failure, but the observed key rotation requires key alignment.
A community encryption choice cannot compensate for different pre-shared authentication secrets.