The update online ext-url-sdb command updates the external malicious URL signature database immediately.
URLs can be filtered based on the external malicious URL list. The external dynamic malicious URL list is a text file of malicious URLs released by external official websites. By updating the external malicious URL signature database, the FW downloads the latest external dynamic malicious URL list from the external official websites and loads it to its cache. To enable the device to identify and block the latest malicious URLs in a timely manner, you need to upgrade the external malicious URL signature database from the external official websites to update the external malicious URL signature database in the device cache. The external malicious URL signature database can be updated periodically or immediately. Generally, the scheduled update mode is used. In some cases, the external malicious URL signature database needs to be updated to the latest version immediately. If the scheduled update period is not reached, you can run the update online ext-url-sdb command to update the signature database immediately.