Performance and protection go hand-in-hand for Next-Generation Firewalls (NGFWs). If Organizations do not want to sacrifice throughput and productivity for security, they might take the decision to disable the DPI for specific Access Rules
Next-Generation firewalls of the past decade have more processing power and broader capabilities, including deep packet inspection (DPI) of the entire packet payload, intrusion prevention, malware detection, gateway anti-virus, traffic analytics, application control, IPSec and SSL VPN.
Unified Threat Management (UTM) represented the next trend in the evolution of the traditional firewall into a product that not only guards against intrusion, but also performs content filtering, data leakage protection, intrusion detection and anti-malware duties typically handled by multiple systems.
In SonicWall by default DPI engine will be enabled and if you want to disable the DPI service for specific access-rules and enable SPI, the following changes have to be made in SonicWall:
Step 1:Disable DPI service for specific access-rule