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If a packet is a part of an existing session, the packet will traverse the device with no additional control. Stateful Inspection engine: Stateful inspection enables the FortiGate firewall to maintain context with active sessions. ![]() Controls related to DOS (Denial of service), IPSEC (IP Security) destination, and routing are performed at the Ingress level. Ingress: Ingress filtering controls the incoming traffic to protect the network from security risks.If any step inside the different layers containing a blocking rule is met, the data package would be discarded. Processing a data packet inside a FortiGate The checks performed by a Fortigate unit can be summarized in four different levels of control. However, additional operations are available such as logging or UTM inspection. The basic option available in the security policy is to accept or deny data packets. If a match is found, the instructions contained in the policy are applied (while a data packet with no matching policy is dropped by default). Based on this information, FortiGate tries to locate a matching security policy. As soon as a data packet is received, the firewall analyzes its source address, its destination address, and the kind of service it is related to. ![]() All the traffic that is received on a unit is analyzed using the Security Policies. This is the free chapter from my book Chapter 2: Filters, Policies, and Endpoint Security After considering the FortiGate routing features, it is necessary to discuss its firewall functionalities. Packt always gives away a chapter from its book.
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