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> Chapter 20 - Parallel Path Processing - Life of a Packet > Example 2 Routing table update

Routing table update packet flow example

The following example illustrates the flow of a packet when there is a routing table update. As this is low level, there is no security involved. This example includes the following steps:

  1. FortiGate unit receives routing update packet
  2. Packet intercepted by FortiGate unit interface.
  3. DoS sensor checks to ensure the sender is valid and not attempting a denial of service attack.
  4. IP integrity header checking. If the packet is OK it continues, otherwise it is dropped.
  1. Stateful policy engine

Local Management traffic

  1. Routing module

Update routing table

The figure below illustrates the process steps.

Life of a Packet - Routing table update