Nokia IP60 User Manual page 323

In this field...
Maximum Compression
Ratio 1:x
When archived file
exceeds limit or extraction
fails
When a password-protected
file is found in archive
Corrupt Files
When a corrupt file is
found or decoding fails
Chapter 14: Using VStream Antivirus
Do this...
Fill in the field to complete the maximum compression ratio of
files that VStream Antivirus should scan.
For example, to specify a 1:80 maximum compression ratio, type
80.
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 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 archives. 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.
Specify how VStream Antivirus should handle corrupt files and
protocol anomalies, by selecting one of the following:
Ignore and continue scanning. Log the corrupt file or
protocol anomaly, and scan the information on a best-
effort basis. This is the default.
Block file. Block and log the corrupt file or protocol
anomaly.
Configuring VStream Antivirus
323