Palo Alto Tutorial: Palo Alto "Basic to advance" : Interactive session. 

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Packet Flow Part-1 • Palo Alto Packet Flow:...
Packet flow part-2. • Palo Alto Packet Flow:...
This training is for packet flow of Palo alto firewall. I have explained in detail how palo alto firewall process the packet flow.
Packet hit the incoming interface
then its source-ip, dst ip , src port and dst port these things are taken by interface
then its integrity is checked if packet is ok to process.
Then firewall will check if this is new request or there is already one session for this.
And here packet enters in slow-path if its new packet.
In this part Lookup happens
Forwarding lookup
NAT Lookup
Policy Lookup
Fast Path
Firewall do below things
Nat is applied.
SSL Decryption
App-Identification
Content inspection
and finally packet is out to the egress interface