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