D-Link NetDefend DFL-CP310 User Manual page 294

Configuring VStream Antivirus
In this field...
Maximum compression
ratio 1:x
When ar chived file
exceeds limit or extraction
fails
When a password-
protected file is found in
archive
278
Do this...
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.
Specify how VStream Antivirus should handle files that exceed
the Maximum nesting level
files for which scanning fails. Select o
•
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.
or the Maximum compression ratio, and
ne of the following:
D-Link NetDefend firewall User Guide