Technical Tip: How to block Malicious address via ISDB

[bmedikonda]

Description	This article explains how to block specific malicious IP addresses from accessing the internal network of the FortiGate using the Internet Service Database (ISDB).
Scope	FortiGate.
Solution	FortiGate uses the ISDB service, which requires an active subscription. It is necessary to ensure that the FortiGate device has a valid subscription for the FortiGuard services, including ISDB. The status of the FortiGuard service can be checked under System -> FortiGuard.  Using the following method, the Malicious IP addresses can be blocked for the pre-defined internet services. If the suspect IP is not in the pre-defined lists, a custom ISDB entry can be requested with the following article: Technical Tip: Custom Internet Service Database (ISDB) entry creation on a FortiGate For the Geography-based internet services, a custom entry can be created inside FortiOS, as explained in Technical Tip: How to create internet service database based on geographical information. Blocking Malicious IP address(Predefined Internet Services): Step 1: Go to Policy & Objects -> Internet Service Database -> Internet Services -> IP Address Lookup -> Search IP. Step2: Create IPv4 Policy: Go to Policy & Objects -> IPv4 policy. Select 'create new'. Name: Provide any name. Incoming interface: Select the incoming interface. Outgoing interface: Select the outgoing interface. Source: Internet Service -> Select the Internet Service details obtained from IP address lookup. Destination: ALL. Schedule: Always. Services: ALL. Action: Deny. Note: In the latest firmware versions (above v7.0) the option for IPv4 policy is replaced with Firewall policy under Policy & Objects.