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Chapter 32 Content Filtering
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551
Alcohol
Sites that promote, offer for sale, glorify, review, or in any way
advocate the use or creation of alcoholic beverages, including
but not limited to beer, wine, and hard liquors. Pages that sell
alcohol as a subset of other products such as restaurants or
grocery stores are not included.
Tobacco
This category includes pages that promote, offer for sale,
glorify, review, or in any way advocate the use or creation of
tobacco or tobacco related products including but not limited to
cigarettes, pipes, cigars and chewing tobacco. Pages that sell
tobacco as a subset of other products such as grocery stores are
not included.
Blogs/Personal Pages
This category includes pages that primarily offer access to
personal pages and blogs. It includes but is not limited to
content that shares a common domain such as web space made
available by an ISP or some other hosting service. Personal
home pages and blogs tend to be dynamic in nature and their
content may vary from innocuous to extreme.
Web Applications
This category includes pages with interactive, Web-based office/
business applications. It excludes email, chat/IM or other sites
that have a specific content category.
Suspicious
This category includes pages considered to have suspicious
content and/or intent that poses an elevated security or privacy
risk. This is determined by analysis of web reputation factors. It
also includes sites that are part of the Web and email spam
ecosystem. Sites that are determined to be clearly malicious or
benign will be placed in a different category.
Alternative Sexuality /
Lifestyles
This category includes pages that provide information, promote,
or cater to alternative sexual expressions in their myriad forms.
It includes but is not limited to the full range of non-traditional
sexual practices, interests, orientations or fetishes. It does not
include sites that are sexually gratuitous in nature which would
typically fall under the Pornography category, nor does it include
lesbian, gay, bi-sexual, transgender or any sites which speak to
one's sexual identity.
LGBT
This category includes pages that provide information
regarding, support, promote, or cater to one's sexual
orientation or gender identity including but not limited to
lesbian, gay, bi-sexual, and transgender sites. It does not
include sites that are sexually gratuitous in nature which would
typically fall under the Pornography category.
Non Viewable
This category includes servers with non-malicious, non-
offensive content or resources used by applications, but not
directly viewable by web browsers. It includes but is not limited
to Web analytics sites (such as visitor tracking and ranking
sites) and content filtering systems.
Content Servers
This category includes servers that provide commercial hosting
for a variety of content such as images and media files. These
types of servers are typically used in conjunction with other web
servers to optimize content retrieval speeds.
Table 162
Configuration > Anti-X > Content Filter > Filter Profile > Add (continued)
LABEL
DESCRIPTION
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32.5.1
Content Filter Blocked and Warning Messages
These are the content filtering warning messages.
The messages for blocked
access are the same but do not include the buttons.
Figure 315
Content Filter Warning Messages
Placeholders
This category includes pages that are under construction,
parked domains, search-bait or otherwise generally having no
useful value.
Test Web Site Category
URL to test
You can check which category a web page belongs to. Enter a
web site URL in the text box.
Test Against Local
Cache
Click this button to see the category recorded in the ZyWALL’s
content filtering database for the web page you specified (if the
database has an entry for it).
Test Against Content
Filter Category Server
Click this button to see the category recorded in the external
content filter server’s database for the web page you specified.
OK
Click
OK
to save your changes back to the ZyWALL.
Cancel
Click
Cancel
to exit this screen without saving your changes.
Table 162
Configuration > Anti-X > Content Filter > Filter Profile > Add (continued)
LABEL
DESCRIPTION
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32.6
Content Filter Customization Screen
Click
Configuration > Anti-X > Content Filter > Filter Profile > Add or Edit
> Customization
to open the
Customization
screen. You can create a list of
good (allowed) web site addresses and a list of bad (blocked) web site addresses.
You can also block web sites based on whether the web site’s address contains a
keyword. Use this screen to add or remove specific sites or keywords from the
filter list.
Figure 316
Configuration > Anti-X > Content Filter > Filter Profile > Customization
The following table describes the labels in this screen.
Table 163
Configuration > Anti-X > Content Filter > Filter Profile > Customization
LABEL
DESCRIPTION
Name
Enter a descriptive name for this content filtering profile
name. You may use 1-31 alphanumeric characters,
underscores(
_
), or dashes (-), but the first character cannot
be a number. This value is case-sensitive.
Enable Custom Service
Select this check box to allow trusted web sites and block
forbidden
web sites. Content filter list customization may be
enabled and disabled without re-entering these site names.
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Allow Web traffic for
trusted web sites only
When this box is selected, the ZyWALL blocks Web access to
sites that are not on the
Trusted Web Sites
list. If they are
chosen carefully, this is the most effective way to block
objectionable material.
Restricted Web Features
Select the check box(es) to restrict a feature. When you
download a page containing a restricted feature, that part of
the web page will appear blank or grayed out.
Block
ActiveX
ActiveX is a tool for building dynamic and active web pages
and distributed object applications. When you visit an ActiveX
web site, ActiveX controls are downloaded to your browser,
where they remain in case you visit the site again.
Java
Java is a programming language and development
environment for building downloadable Web components or
Internet and intranet business applications of all kinds.
Cookies
Cookies are files stored on a computer’s hard drive. Some web
servers use them to track usage and provide service based on
ID.
Web Proxy
A server that acts as an intermediary between a user and the
Internet to provide security, administrative control, and
caching service. When a proxy server is located on the WAN it
is possible for LAN users to circumvent content filtering by
pointing to this proxy server.
Allow Java/ActiveX/
Cookies/Web proxy to
trusted web sites
When this box is selected, the ZyWALL will permit Java,
ActiveX and Cookies from sites on the
Trusted Web Sites
list
to the LAN. In certain cases, it may be desirable to allow Java,
ActiveX or Cookies from sites that are known and trusted.
Trusted Web Sites
These are sites that you want to allow access to, regardless of
their content rating, can be allowed by adding them to this
list.
Add
Click this to create a new entry.
Edit
Select an entry and click this to be able to modify it.
Remove
Select an entry and click this to delete it.
Trusted Web Site
This column displays the trusted web sites already added.
Enter host names such as www.good-site.com into this text
field. Do not enter the complete URL of the site – that is, do
not include “http://”. All subdomains are allowed. For
example, entering “zyxel.com” also allows “www.zyxel.com”,
“partner.zyxel.com”, “press.zyxel.com”, and so on. You can
also enter just a top level domain. For example, enter .com to
allow all .com domains.
Use up to 63 characters (0-9a-z-). The casing does not matter.
Forbidden Web Site List
Sites that you want to block access to, regardless of their
content rating, can be allowed by adding them to this list.
Add
Click this to create a new entry.
Edit
Select an entry and click this to be able to modify it.
Remove
Select an entry and click this to delete it.
Table 163
Configuration > Anti-X > Content Filter > Filter Profile > Customization
LABEL
DESCRIPTION
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32.7
Content Filter Technical Reference
This section provides content filtering background information.
Forbidden Web Sites
This list displays the forbidden web sites already added.
Enter host names such as www.bad-site.com into this text
field. Do not enter the complete URL of the site – that is, do
not include “http://”. All subdomains are also blocked. For
example, entering “bad-site.com” also blocks “www.bad-
site.com”, “partner.bad-site.com”, “press.bad-site.com”, and
do on. You can also enter just a top level domain. For
example, enter .com to block all .com domains.
Use up to 63 characters (0-9a-z-). The casing does not matter.
Blocked URL Keywords
This section allows you to block Web sites with URLs that
contain certain keywords in the domain name or IP address.
Add
Click this to create a new entry.
Edit
Select an entry and click this to be able to modify it.
Remove
Select an entry and click this to delete it.
Blocked URL Keywords
This list displays the keywords already added.
Enter a keyword or a numerical IP address to block. You can
also enter a numerical IP address.
Use up to 63 case-insensitive characters (0-9a-zA-Z;/
?:@&=+$\.-_!~*()%). For example enter Bad_Site to block
access to any web page that includes the exact phrase
Bad_Site. This does not block access to web pages that only
include part of the phrase (such as Bad for example).
OK
Click
OK
to save your changes back to the ZyWALL.
Cancel
Click
Cancel
to exit this screen without saving your changes.
Table 163
Configuration > Anti-X > Content Filter > Filter Profile > Customization
LABEL
DESCRIPTION

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