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> Chapter 20 - Parallel Path Processing - Life of a Packet > Introduction


Directed by security policies, a FortiGate unit screens network traffic from the IP layer up through the application layer of the TCP/IP stack. This chapter provides a general, high‑level description of what happens to a packet as it travels through a FortiGate unit running FortiOS 5.2.x.

This FortiOS Handbook chapter contains the following sections:

Packet flow describes the life of a packet as it passes through a FortiGate unit

Comparison of inspection types shows how different security functions map to different inspection types.

Client/Server connection packet flow example

Routing table update packet flow example

Dialup IPsec VPN with Application control example