Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
Content Filtering Support Overview
▀ Introduction
▄ Cisco ASR 5000 Series Product Overview
OL-22937-01
Introduction
Content Filtering is an in-line service that is supported to filter HTTP and WAP requests from mobile subscribers based
on the URLs in the requests. This enables operators to filter and control the content that an individual subscriber can
access, so that subscribers are inadvertently not exposed to universally unacceptable content and/or content
inappropriate as per the subscribers‘ preferences.
on the URLs in the requests. This enables operators to filter and control the content that an individual subscriber can
access, so that subscribers are inadvertently not exposed to universally unacceptable content and/or content
inappropriate as per the subscribers‘ preferences.
The Content Filtering service offers the following solutions:
URL Blacklisting:
In the URL Blacklisting solution, all HTTP/WAP URLs in subscriber requests are matched against a database
of ―blacklisted‖ URLs. If there is a match, the flow is discarded, redirected, or terminated as configured. If
there is no match, subscribers view the content as they would normally.
of ―blacklisted‖ URLs. If there is a match, the flow is discarded, redirected, or terminated as configured. If
there is no match, subscribers view the content as they would normally.
URL Blacklisting may/may not be a subscriber opt-in service, operators can enable URL Blacklisting either for
all subscribers or for a subset of subscribers. Typical cases include applying a blacklisted database of child
porn URLs to all subscribers so that they are inadvertently not exposed to such universally unacceptable
content.
all subscribers or for a subset of subscribers. Typical cases include applying a blacklisted database of child
porn URLs to all subscribers so that they are inadvertently not exposed to such universally unacceptable
content.
Category-based Content Filtering:
This release supports the following types of Category-based Content Filtering:
Category-based Static Content Filtering:
In Category-based Static Content Filtering, all HTTP/WAP URLs in subscriber requests are matched
against a static URL categorization database. Action is taken based on a URL‘s category, and the
action configured for that category in the subscriber‘s content filtering policy. Possible actions include
permitting, blocking, redirecting, and inserting/altering content.
against a static URL categorization database. Action is taken based on a URL‘s category, and the
action configured for that category in the subscriber‘s content filtering policy. Possible actions include
permitting, blocking, redirecting, and inserting/altering content.
Category-based Static-and-Dynamic Content Filtering:
In Category-based Static-and-Dynamic Content Filtering, if static rating categorizes a URL as either
―dynamic‖ or ―unknown‖, the ―requested content‖ is sent for dynamic rating. Wherein the ―requested
content‖ is analyzed and categorized. Action is taken based on the category determined by dynamic
rating, and the action configured for that category in the subscriber‘s content filtering policy. Possible
actions include permitting, blocking, redirecting, and inserting/altering content.
―dynamic‖ or ―unknown‖, the ―requested content‖ is sent for dynamic rating. Wherein the ―requested
content‖ is analyzed and categorized. Action is taken based on the category determined by dynamic
rating, and the action configured for that category in the subscriber‘s content filtering policy. Possible
actions include permitting, blocking, redirecting, and inserting/altering content.
Typically Category-based Content Filtering is an opt-in service, subscribers self-choose a content-filtering policy or
plan, such as Teen, Child, Adult, etc., and are subjected to content filtering as per their chosen plan. Also, the content-
filtering policies of different subscribers may be different, enabling differential access of content to them. This solution
provides maximum flexibility, and is also referred to as the Policy-based Content Filtering.
plan, such as Teen, Child, Adult, etc., and are subjected to content filtering as per their chosen plan. Also, the content-
filtering policies of different subscribers may be different, enabling differential access of content to them. This solution
provides maximum flexibility, and is also referred to as the Policy-based Content Filtering.
Both URL Blacklisting and Category-based Content Filtering support can be concurrently enabled on a system.
Content Filtering uses Deep Packet Inspection (DPI) feature of Enhanced Charging Service (ECS) to discern HTTP and
WAP requests.
WAP requests.