Chain Of Events; Scenario 1 - D-Link DFL-1600 User Manual

19.2. Chain of Events

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19.2 Chain of Events
The following is a simplified picture of the chain of events when a packet
arrives on the firewall, with focus on the IDS (note that no other
sub-systems are considered here). Two scenarios are possible, one where the
firewall rule set has to accept the packet before passing it on to the IDS,
and one where the IDS can processes traffic even if the rule set decides that
the packet should be dropped.
19.2.1

Scenario 1

Traffic is only passed on to the IDS if the firewall's IP rule set decides that
it is valid, shown in Figure 19.1.
Figure 19.1: IDS Chain of Events Scenario 1
D-Link Firewalls User's Guide