ZyXEL Communications NBG-417N - V1.0 Manual page 143

Chapter 14 Content Filtering
For example, filename URL checking searches for keywords within the URL
www.zyxel.com.tw/news/pressroom.php.
Use the ip urlfilter customize actionFlags 8 [disable | enable]
command to extend (or not extend) the keyword blocking search to include the
URL's complete filename.
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NBG-417N User's Guide