Fortigate/Fortiwifi - diagnostic data flow across the router

Below is an example. I have a node 192.168.x.x which I doesn't know why it cannot goes to Internet through my Fortigate.  Since the traffic is likely denied, I cannot view it via Fortiview.

We can dump out the internal handling of the traffic at console:

# diagnose debug reset

# diagnose debug flow filter saddr 192.168.x.x

# diagnose debug flow show console 
show trace messages on console

# diag debug  enable 

# diagnose debug flow show console enable 
show trace messages on console

# diag debug flow trace start 100



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