Draytek Vigor2500V Manual page 79

Enable URL Access Control: One checkbox appears giving the choice
to activate the URL Access Control or not. To enable it, click on the
empty
box image and, subsequently, the hook image ( ) will appear.
Block Keyword List: The Vigor router provides 8 frames for users
to define keywords and each frame supports multiple keywords.
The keyword could be a noun, a partial noun, or a complete URL
string. Multiple keywords within a frame are separated by space,
comma, or semicolon.
frame is 32 characters. After specifying keywords, the Vigor router
will reject the access right of any website whose whole or partial
URL string matched any user-defined keyword.
noticed that the more simplified the blocking keyword list, the more
efficiently the Vigor router perform.
Example: If you want to filter any website whose URL string
contains "sex", "fuck", "gun", or "drug", you should add these words
Firewall
In addition, the maximal length of each
6-20
"
It should be