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

[David Botham]

bind-users-bounce at isc.org wrote on 10/07/2004 04:35:32 AM:
> David Botham <DBotham at OptimusSolutions.com> wrote in
> news:ck1i5t$lso$1 at sf1.isc.org: 
> 
> >> client 81.206.200.71#1026: query: . IN NS
> > 
> > I am fairly certain this log entry indicates that the computer at IP 
> > address 81.206.200.71 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 ?

Normal, I do not know.  Is it the same server that keeps asking?  Are 
those servers in your network and authorized to use your name server for 
resolution?  There are too many variables to answer that question. Perhaps 
you can contact the admin of the system(s) in question and ask them what 
is going on... If they are not in your network and not authorized to use 
your name servers, use ACL's to exclude them...


Dave...

> Aren't they supposed to keep a cache of this kind of information ?
> 
> -- 
> Nicolas Ecarnot
>