Packet flow: FortiGates with NP6 processors – packets in an NTurbo session

Packet flow: FortiGates with NP6 processors – packets in an NTurbo session

If your FortiGate supports NTurbo, many flow-based UTM/NGFW sessions can be offloaded to NP6 processors.


After the first packet, subsequent packets in an offloaded flow-based UTM/NGFW session skip routing, and kernel processors. Flow-based UTM/NGFW operations are still handled by the CPU with IPSA offloading pattern matching to CP8 or CP9 processors.

If a security threat is found the session is dropped. Otherwise, packets that are not blocked by UTM/NGFW are forwarded out of the egress interfaces by the NP6 processor.

NTurbo is not compatible with DoS polices, session helpers, or and most types of tunneling. If any of these features are present, flow-based UTM/NGFW sessions are not offloaded by NTurbo.


Having trouble configuring your Fortinet hardware or have some questions you need answered? Check Out The Fortinet Guru Youtube Channel! Want someone else to deal with it for you? Get some consulting from Fortinet GURU!

This entry was posted in FortiOS 5.4 Handbook and tagged on by .

About Mike

Michael Pruett, CISSP has a wide range of cyber-security and network engineering expertise. The plethora of vendors that resell hardware but have zero engineering knowledge resulting in the wrong hardware or configuration being deployed is a major pet peeve of Michael's. This site was started in an effort to spread information while providing the option of quality consulting services at a much lower price than Fortinet Professional Services. Owns PacketLlama.Com (Fortinet Hardware Sales) and Office Of The CISO, LLC (Cybersecurity consulting firm).

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.