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A Day in the Life of a Packet on a 50G FortiGate, Part 4: Firewall Policy, NAT, and Security Profiles
Routing told the packet where it's going. Firewall policy decides whether it's allowed, NAT rewrites it, and security profiles inspect it. Inside the iprope chain, central NAT vs policy NAT, VIPs, IP pools, and the flow-vs-proxy UTM pipeline.