i got few tools to calculate , like dnsstuff .
but i dont understand whats the theory behind to calculate dns repose time .
I know their ranking some times wrong. but on what theory they use to calculate that
eample : if i do dig @fosiul.co.uk
i get 40 msec to 43 msec query time..
but if i look at dnsstuff their
Average of all 2 nameservers: 490ms (plus 360ms overhead).
so they are adding some other thing.. but whats those ???
note : here i want to know the theory of calculating
thanks for your help