Stateful and deep packet inspection (SPI and DPI)
Firewalls. The pocketknife for enforcing computer security
Article REF: TE7550 V2
Stateful and deep packet inspection (SPI and DPI)
Firewalls. The pocketknife for enforcing computer security

Author : Maryline LAURENT

Publication date: October 10, 2017, Review date: January 3, 2024 | Lire en français

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8. Stateful and deep packet inspection (SPI and DPI)

The filtering function of firewalls continues to evolve, with the dual objective of filtering flows ever more finely and quickly. The most recent developments have resulted in packet inspection mechanisms, which can be divided into two main families with very different objectives:

  • stateful packet inspection is used within organizations to filter IP flows according to IP and TCP headers in the same way as a stateful packet filter (§ 5

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