D-Link DFL-CPG310 Product Manual - Page 294
Maximum compression ratio, Pass file without scanning., Block file., Maximum nesting level
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Configuring VStream Antivirus In this field... Do this... Maximum compression ratio 1:x Fill in the field to complete the maximum compression ratio of files that VStream Antivirus should scan. For example, to specify a 1:150 maximum compression ratio, type 150. Setting a higher number allows the scanning of highly compressed files, but creates a potential for highly compressible files to create a heavy load on the appliance. Setting a lower number prevents attackers from overloading the gateway by sending extremely compressible files. The default value is 100. When archived file exceeds limit or extraction fails When a passwordprotected file is found in archive Specify how VStream Antivirus should handle files that exceed the Maximum nesting level or the Maximum compression ratio, and files for which scanning fails. Select one of the following: • Pass file without scanning. Scan only the number of levels specified, and skip the scanning of more deeply nested archives. Furthermore, skip scanning highly compressible files, and skip scanning archives that cannot be extracted because they are corrupt. This is the default. • Block file. Block the file. VStream Antivirus cannot extract and scan password-protected files inside archive. Specify how VStream Antivirus should handle such files, by selecting one of the following: • Pass file without scanning. Accept the file without scanning it. This is the default. • Block file. Block the file. 278 D-Link NetDefend firewall User Guide