Chapter 8 Hardware Acceleration : Hardware acceleration overview : Network processors (NP1, NP2, NP3, NP4 and NP6) : Configuring NP HMAC check offloading
  
Configuring NP HMAC check offloading
Hash-based Message Authentication Code (HMAC) checks offloaded to network processors by default. You can enter the following command to disable this feature:
configure system global
set ipsec-hmac-offload disable
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