How packet flow in Palo Alto Firewall?

Basic:

Initial Packet Processing —-> Security Pre-Policy —-> Application —-> Security Policy —-> Post Policy Processing

Advance:

Initial Packet Processing —-> Source Zone/Source Address —-> Forward Lookup —-> Destination Zone/Destination Address —-> NAT policy evaluated

 

Security Pre-Policy —-> Check Allowed Ports —-> Session Created

 

Application —-> Check for Encrypted Traffic —-> Decryption Policy —-> Application Override Policy —-> Application ID

 

Security Policy —-> Check Security Policy —-> Check Security Profiles

 

Post Policy Processing —-> SSL Re-Encrypted —-> NAT applied —-> Packet forwarding