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knoel
Staff
knoel
Staff
December 8, 2025

Technical Tip: Resolving FortiGate issues related to NP7 defrag/reassembly bug ID 1164332

  • December 8, 2025
  • 0 replies
  • 802 views
Description This article describes the process of resolving issues related to NP7 DFR (defrag/reassembly) of super jumbo frame on FortiGate devices running FortiOS 7.4.5+. It provides a step-by-step guide to addressing a known issue.

Triggering the bug will cause NP7 to stop forwarding traffic.
Scope FortiGate.
Solution

To resolve issues related to NP7 no longer forwarding traffic triggered by super jumbo frame reassembly on FortiGate devices running 7.4.5+, follow these steps:

 

  1. If bug ID 1164332 is encountered where NP7 stops forwarding after reassembling a large packet in DFR, workaround the issue by disabling NP7 DFR using the following commands:

 

config sys npu config ip-reassembly set status disable end end

 

  1. Identify large packet sizes: Be aware that packets larger than 16316 bytes can trigger the NP7 traffic forwarding issue unless the workaround is in place. Take necessary measures to handle such packets in the network.
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