According to the FortiOS 7.6 Troubleshooting and Administration guides, the diagnose debug flow command provides a step-by-step trace of how the FortiGate unit processes a packet.
First, the line "find a route: flag=00000000 gw-0.0.0.0 via port2" indicates that during the routing table lookup, the FortiGate matched the destination against its default route (represented by 0.0.0.0) and determined that the egress interface is port2 . This confirms that the default gateway for this traffic is reachable via port2 (Statement A).
Second, the debug trace concludes with the messages "policy-2 Is matched, act-drop" and "Denied by forward policy check (policy 2)" . This explicitly indicates that the packet successfully matched the criteria for firewall policy ID 2, and the action configured for that policy is set to Deny (Statement D).
Statement B is incorrect because a Reverse Path Forwarding (RPF) failure would be indicated by a specific " reverse path check fail, drop " message, which is absent here. Statement C is incorrect because the output shows "proto=1" , which corresponds to ICMP (Ping) traffic. UDP traffic would be identified as protocol 17.
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