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A Day in the Life of a Packet on a 50G FortiGate, Part 2: Stateful Inspection, Session Lookup, and Anti-Spoofing
The packet has been punted from the NP7 to the kernel. Now FortiOS does the things ASICs cannot: IP integrity, DoS sensors, RPF, session table lookup, helpers, and the state machine that decides whether this is a brand new flow or one we already know.