Many '...query: . IN NS' in query log file

Nicolas Ecarnot nicolas.ecarnot at
Thu Oct 7 08:35:32 UTC 2004

David Botham <DBotham at> wrote in
news:ck1i5t$lso$1 at 

>> client query: . IN NS
> I am fairly certain this log entry indicates that the computer at IP 
> address is asking your name server for the NS RR's for
> the root zone.

It seems clear, but is this normal that those servers asks that every ten 
second ?
Aren't they supposed to keep a cache of this kind of information ?

Nicolas Ecarnot

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