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ISDB is a local database service. The automatic engine, which is part of the ISDB design, collects the IPs from multiple sources and updates the database every day, including official documents, ASN Records, DNS lookup, Reverse DNS lookup, SSL Certificates, etc. ISDB uses crawling for automatic source monitoring.
The automatic engine performs the DNS lookup every day and keeps the results for 2 days. The records older than two days will not be included in the next release.
Currently, there are two regular releases every day from Monday to Friday, meaning 10 releases every week. The firewall receives two updates every day if it is configured for an automatic update.
The updates cannot be reflected in real-time as ISDB is not an online service. Any updates can only be reflected along with the package release.
Anyone can report ISDB-related issues directly to the ISDB team via the FortiGuard ISDB contact form or by sending an email to fortiflow@fortinet.com.
Related article:
Technical Tip: Manual Update of Internet Service Database (ISDB) Package
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