Understanding Express Antivirus Scanner Pattern Updates

Express antivirus uses a different signature database than the full antivirus signature database. The express antivirus signature database is called Juniper Express antivirus database and it is compatible with the hardware engine. The express signature database targets only critical viruses and malware, including worms, Trojans, and spyware. This is a smaller sized database, providing less coverage than the full antivirus signature database.

The express antivirus pattern database is updated over HTTP or HTTPS and can occur automatically or manually. This is similar functionality to that found in full antivirus with some minor differences:

• With express antivirus, the signature database auto-update interval, is once a day.
• With express antivirus, there is no support for the downloading of multiple database types.
• With express antivirus, during database loading, all scan operations are interrupted. Scan operations for existing traffic flows are stopped and no new scan operations are initiated for newly established traffic flows. You can specify the desired action for this interruption period using the fall-back parameter for engine-busy-loading-database. The available actions are block or log-and-permit.
• By default, the URL for express antivirus is http://update.juniper-updates.net/EAV/SRX210. “SRX210” in the URL is the platform name. This part of the URL is different and platform specific for each platform. (Other than the platform name, you should not change this URL unless you are experiencing problems with it and have called for support.)

Note: Once your subscription expires, you have a 30 day grace period during which you can continue to update the antivirus pattern file. Once that grace period expires, the update server no longer permits antivirus pattern file updates. The express Antivirus scanning feature is a separately licensed subscription service. When your antivirus license key expires, you can continue to use locally stored antivirus signatures. But in that case, if the local database is deleted, antivirus scanning is disabled.

Related Topics

Junos OS Feature Support Reference for SRX Series and J Series Devices