Hello Prabhu,
 
- The RFS4000 supports web filtering. 
- A license is required for web filtering  
- Only DPI compliant APs may be used (more on this in Feature overview) 
Feature overview: https://gtacknowledge.extremenetworks.com/articles/Q_A/What-is-the-WING-URL-Based-Filtering-or-Web-Filtering-Feature
Instructions: https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-configure-Web-Filtering-feature-in-WiNG
More on WiNG licensing: https://gtacknowledge.extremenetworks.com/articles/Q_A/What-types-of-licenses-are-used-in-WiNG
I hope this helps,
Chris
					
				
			
			
				
	Christoph S.