how to limit specified client visit virtual server use irules

try this irule withLocal Traffic ›› iRules : Data Group List (access_list)

when HTTP_REQUEST {

   if { ( [string tolower [HTTP::host]] equals "/" ) and not ( [class match [IP::client_addr] equals access_list]) } {

     HTTP::respond 200 content "You are not authorized to view this page."

   }

}

or

when CLIENT_ACCEPTED {

        if { [class match [IP::client_addr] equals access_list] } {

            accept

            }

    }