Web Gateway 7.1.5 Product Guide - McAfee

Lists for media type filtering
Web filtering
Media type filtering 6
You can maintain lists for media type filtering. This section explains different types of these lists and
some sample lists that are used by the library rules. It also describes how you add a media type to a
list.some sample lists that are used by the library rules.
Media type lists contain different kinds of media, such as text, audio, image, streaming, and others.
When editing these lists, you do not type names of media types, but select them from folders. Some
lists are provided by the system and cannot be edited at all. You can use them only as they are.
Apart from being system or user-maintained lists, lists used in media type filtering are the same with
regard to editing. However, you can use them for different purposes and this way have blocking lists,
whitelists, upload lists, download lists, or even upload blocking lists, upload whitelists, and so on.
The following is an overview of the kinds of media type filtering lists you can use on the appliance.
However, you can also create and use lists and lists types other than these.
• Upload whitelists and blocking lists — Lists of media types that users are allowed or not to upload
to the web
• Download whitelist and blocking lists — Lists of media types that are allowed or not when users
attempt to download them from the web
With regard to editing, media type filtering lists can be:
• Custom lists — Can be reviewed and edited like all other custom lists
• System lists — Are provided by the appliance system and cannot be edited
There are system lists for text, audio, image, streaming, and other media types.
You can view these lists under System Lists | Media Types on the Lists tab of the Policy
top-level menu.
If you see, for example, that a media type is on a system list used by a blocking rule, but do not
want this media type to be blocked, you cannot remove it from the list. However, you can modify
the rule to let it not use the system list, but a custom list without the media type in question.
Sample lists for media type filtering
This section describes some sample lists used by the Media Type Filtering rule set from the library.
When you import the rule set, these lists are also imported. You can find them on the Lists tab of the
Policy top-level menu, sorted by their names.
For general information on how to maintain lists, see List maintenance.
Upload Media Type Blocklist
List of media types that are blocked when users attempt to upload to them to the web
Type — Media Type
The list is initially empty.
The following table describes the list entries.
Table 6-10 Upload Media Type Whitelist
Option Definition
Media type Media type that is not allowed for uploading to the web
Comment Plain-text comment on a media type
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