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  1. SECTION 1: OVERVIEW. SECTION 2: INGRESS STAGE. 2.1 PACKET PARSING. 2.2 TUNNEL DECAPSULATION. 2.3 IP DEFRAGMENTATION. SECTION 3: FIREWALL SESSION LOOKUP. 3.1. ZONE PROTECTION CHECKS. 3.2. TCP STATE CHECK. 3.3. FORWARDING SETUP. 3.4. NAT POLICY LOOKUP. 3.5. USER- ID. 3.6. DOS PROTECTION POLICY LOOKUP. 3.7. SECURITY POLICY LOOKUP. 3.8.

    • Ingress Stage
    • Firewall Session Lookup
    • Firewall Session Fast Path
    • Application Identification
    • Content Inspection
    • Forwarding/Egress
    • Conclusion

    This stage receives packet, parses the packets and passes for further inspection. Firewall continues with a session lookup and other security modules. After that firewall forwards the packet to the egress stage.

    Firewall inspects the packet and performs the lookup on packet. Firewall session includes two unidirectional flows, where each flow is uniquely identified. In PAN-OS, the firewall finds the flow using a 6-tuple terms: 1. Source and destination addresses: IP addresses from the IP packet. 2. Source and destination ports: Port numbers from TCP/UDP pro...

    Session fast path checks the packet from layer 2 to layer 4 and passes under below conditions: – 1. If the session is in discard state, then the firewall discards the packet. 2. If the session is active, refresh session timeout. 3. If the packet is a TCP FIN/RST, the session TCP half closed timer is started if this is the first FIN packet received ...

    Firewall firstly performs an application policy lookup to see if there is a rule match. If there is no application rule, then application signatures are used to identify the application.

    Firewall performs content Inspection, identifies the content and permits as per security policy rule. Next, it forwards the packet to the forwarding stage.

    Firewall performs QoS shaping as applicable in the egress process. Firewall inspects the packet MTU size and the fragment bit settings on the packet at egress interface and performs fragmentation i...
    If the egress interface is a tunnel interface, then IPsec/SSL-VPN tunnel encryption is performed.

    Packet is inspected by Palo Alto Firewall at various stages from ingress to egress and performs the defined action as per policy / security checks and encryption. Packet passes from Layer 2 checks and discards if error is found in 802.1q tag and MAC address lookup. Packet is forwarded for TCP/UDP check and discarded if anomaly in packet. Next is de...

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  3. Packet flow | Palo alto Firewall. This video describes the packet handling sequence inside of PAN-OS devices. Please comment your email id or drop us an email on netsecure18@gmail.com...

    • 11 min
    • 19.3K
    • Cloud Guard
  4. Packet Flow and Order of Operations in PAN-OS. Order of operations in Palo Alto Networks firewalls consists of 6 stages: Ingress > Session Setup (Slowpath) > Existing Session (Fastpath) > Application Identification > Content Inspection > Egress Forwarding. Understanding how traffic is being processed within the firewall is important for writing ...

  5. The firewall exports the statistics as NetFlow fields to a NetFlow collector. The NetFlow collector is a server you use to analyze network traffic for security, administration, accounting and troubleshooting. All Palo Alto Networks firewalls support NetFlow Version 9. The firewalls support only unidirectional NetFlow, not bidirectional.

  6. Sep 25, 2018 · A packet received by Palo Alto Networks firewall will be processed differently depending on state of the matching session. This document explains the difference between packet processed in Slow Path, Fast Path and packet Offloaded.

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