The Internet Service Database (ISDB) in FortiGate is used to enforce content filtering at Layer 3 (Network Layer) and Layer 4 (Transport Layer) of the OSI model by identifying applications based on their predefined IP addresses and ports.
FortiGate has a predefined list of all IPs and ports for specific applications downloaded from FortiGuard:
● FortiGate retrieves and updates a predefined list of IPs and ports for different internet services from FortiGuard.
● This allows FortiGate to block specific services at Layer 3 and Layer 4 without requiring deep packet inspection.
The ISDB blocks the IP addresses and ports of an application predefined by FortiGuard:
● ISDB works by matching traffic to known IP addresses and ports of categorized services.
● When an application or service is blocked, FortiGate prevents communication by denying traffic based on its destination IP and port number.
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