so that also means that the client has to be kept connected to the dns server ? if so, that's a nice spot for user tracking. if not, how do you push data to c

so that also means that the client has to be kept connected to the dns server ? if so, that's a nice spot for user tracking. if not, how do you push data to clients behind a nat, without a stateful and persistant tcp connection? for most dns queries udp is sufficient (although sometimes tcp is necessary). 500GB ram for 100k records seems quite a lot btw.