Fortinet NSE7_NST-7.2 Dumps Questions Answers

Analyzing Debug Output:

The debug output shows multiple proposals with encryption algorithms likeAES CBCand hashing algorithms likeSHA256.

The negotiation failure (no SA proposal chosen) suggests that there is a mismatch in the encryption or hashing algorithms between the local and remote gateways.

Configuration Change:

To resolve the phase 1 negotiation error, the local gateway needs to include a compatible proposal.

AddingAES256-SHA256to the phase 1 proposal configuration ensures that both gateways have a matching set of encryption and hashing algorithms.

References:

Fortinet Documentation: Configuring IPsec Tunnels​(Fortinet Docs)​​(Welcome to the Fortinet Community!)​.

Fortinet Community: Troubleshooting IKE Negotiation Failures​(Welcome to the Fortinet Community!)​​(Welcome to the Fortinet Community!)​.

The exhibit shows a sniffer capture where TCP port 8013 is being used for communication. The communication appears one-way, indicating potential issues with the upstream FortiGate receiving the necessary packets or being able to respond.

To ensure successful communication in a Security Fabric setup:

Ensure TCP port 8013 is not blocked along the way: Verify that no firewalls or network devices between the downstream and upstream FortiGates are blocking TCP port 8013. This port is crucial for Security Fabric communication.

Authorize the downstream FortiGate on the root FortiGate: In the Security Fabric, the root FortiGate must recognize and authorize the downstream FortiGate to allow proper communication and management.

Enable Security Fabric/Fortitelemetry on the receiving interface of the upstream FortiGate: The upstream FortiGate must have the Security Fabric or Fortitelemetry enabled on the interface that receives the communication from the downstream FortiGate. This enables proper data exchange and monitoring within the Security Fabric.

References

Fortinet Documentation on Security Fabric Configuration

Fortinet Community Discussion on Port Requirements

Anti-replay Enabled:

The exhibit showsreplay: enabled, which confirms that anti-replay is enabled for this IPsec tunnel. Anti-replay is a security feature that prevents replay attacks by ensuring that packets are not duplicated or reused.

NPU Acceleration:

TheNPU acceleration: encryption (outbound) decryption (inbound)line indicates that Network Processing Unit (NPU) acceleration is used.

The npu_flag for this tunnel is 02. This indicates that encryption and decryption are handled by the NPU, improving the performance of the VPN tunnel.

References:

Fortinet Community: Troubleshooting IPsec VPN Tunnels​(Welcome to the Fortinet Community!)​​(Welcome to the Fortinet Community!)​.

Fortinet Documentation: Verifying IPsec VPN Tunnels​(Fortinet Docs)​​(Fortinet Docs)​.