after router rb450G working 200 machines
dns servers give to machines from ISP.
many poeple work well in internet, but part of them with problem: couldn't resolve ip address ya.ru or google.com.ua or others
and ping 4.2.2.2 is work ok.
At this moment go to firewall connections and see dns query from client IP, port 53 is weighs

please help what is this???