Trend Micro InterScan Gateway Security Appliance M-Series ...

Trend Micro InterScan Gateway Security Appliance M-Series Administrator’s Guide
6-8
• Extracted file size/compressed file size ratio exceeds
• Action to take on unscannable files
• Pass
• Block
5. Optionally, in the MIME Type Exceptions section, type any MIME types (for
example, streaming audio/video) to exclude from scanning. (See Setting MIME
Type Exceptions on page 6-8 for more information.)
6. Specify how to handle large files.
• Do not scan files larger than: Set size in MB. Default is 50 MB
• Enable deferred scan: Select to enable the appliance to periodically send
parts of the file to the client. Enabling deferred scan helps prevent HTTP
downloads of large files from timing out.
• Start sending parts of the file to the client after: The appliance starts
sending parts of a large file to clients after a specified period so the
connection between the client and the appliance will not time out.
7. Click Save.
Setting MIME Type Exceptions
There are many MIME types. To exclude specific MIME types from scanning, type
the exact MIME type in the MIME Type Exceptions section of the HTTP Scanning
Target tab.
Common Internet Media Types
To find the MIME type of a certain kind of file to exclude from scanning, the table
below for a description of commonly used MIME types.
TABLE 6-1. Common Internet media types and subtypes, by category
Type: Audio
Type/Subtype Description
audio/mpeg MP3 or other MPEG audio
audio/x-ms-wma Microsoft Windows Media Audio file
audio/x-realaudio RealAudio file
audio/x-wav WAV audio file