ASUS DSL-AC55U 用户手册

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You can specify keywords or web addresses to prevent access to 

specific URLs.

NOTE:  The URL Filter is based on a DNS query. If a network client has 

already accessed a website such as http://www.abcxxx.com, then the 

website will not be blocked (a DNS cache in the system stores previously 

visited websites). To resolve this issue, clear the DNS cache before 

setting up the URL Filter.

To set up a URL filter:
1.  From the navigation panel, go to Advanced Settings > 

Firewall > URL Filter tab.

2.  On the Enable URL Filter field, select Enabled.
3.  Enter a URL and click the 

button.

4. Click 

Apply.