User`s manual

Web content filtering
Use DFL-500 Web content filtering to block Web sites containing unwanted content. You can configure the
DFL-500 to:
• Block web pages that contain unwanted content
• Block access to Internet sites
• Remove scripts from web pages
Web content filtering is only supported in NAT mode.
Block web pages that contain unwanted content
Block web pages that contain content that you want to keep out of your internal network by enabling content
blocking and then creating a list of banned words. With content blocking enabled and a list of banned words in
place, the DFL-500 blocks access to all web content that contains any of the banned words.
This section describes:
• Enabling the banned word list
• Adding words to the banned word list
• Temporarily disabling the banned word list
• Temporarily disabling individual words in the banned word list
• Clearing the banned word list
• Creating the banned word list using a text editor
Enabling the banned word list
Use the following procedure to turn on content blocking by enabling the banned word list.
From the web-based manager:
• Go to Web Filter > Content Block .
• Click Enable Banned Word to enable content blocking.
The DFL-500 is now configured to block web pages containing words added to the banned word list.
Adding words to the banned word list
Use the following procedure to add words to the banned word list after content blocking has been enabled.
From the web-based manager:
• Go to Web Filter > Content Block .
• Click New to add a word to the banned word list.
• Choose a character set for the banned word.
You can choose Western, Simplified Chinese, Traditional Chinese, Japanese, or Korean.
• Type the banned word.
Your computer and web browser must be configured to enter characters in the character set that you
have chosen.
• Click OK.
• Click the check box beside the word so that DFL-500 blocks web pages containing this word.
DFL-500 User’s Manual
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