When Kaspersky Security Center downloads updates from Kaspersky update servers, it optimizes traffic by using diff files. You can also enable the usage of diff files by devices (Administration Servers, distribution points, and client devices) that take updates from other devices on your network.
About the Downloading diff files feature
A diff file describes the differences between two versions of a file of a database or software module. The usage of diff files saves traffic inside your company's network because diff files occupy less space than entire files of databases and software modules. If the Downloading diff files feature is enabled on Administration Server or a distribution point, the diff files are saved on this Administration Server or distribution point. As a result, devices that take updates from this Administration Server or distribution point can use the saved diff files to update their databases and software modules.
To optimize the usage of diff files, we recommend that you synchronize the update schedule of devices with the update schedule of the Administration Server or distribution point from which the devices take updates. However, the traffic can be saved even if devices are updated several times less often than are the Administration Server or distribution point from which the devices take updates.
The Downloading diff files feature can be enabled only on Administration Servers and distribution points of versions starting from version 11. To save diff files on Administration Servers and distribution points of earlier versions, upgrade them to version 11 or later.
The Downloading diff files feature is incompatible with the offline model of update download. This means that Network Agents that use the offline model of update download do not download diff files even if the Downloading diff files feature is enabled on the Administration Server or distribution point that delivers updates to these Network Agents.
Distribution points do not use IP multicasting for automatic distribution of diff files.