Turning off recusion

Barry Margolin barmar at alum.mit.edu
Fri Oct 20 01:58:06 UTC 2006

In article <eh8el4$247j$1 at sf1.isc.org>, churchers at gmail.com wrote:

> We have 3 nameservers which are now authorative for about 1000 domain
> names and have,
> unfortunately, been historically used as general purpose resolvers.
> I would like to turn off recusion but if I do, they start reporting any
> domain name they don't run dns
> for as being non-existant.
> --
> pegasus# ping www.google.com
> ping: cannot resolve www.google.com: No address associated with name
> --
> Shouldn't they be referring the lookup to parent nameservers or am I
> missing something?

Referring who to the parent nameservers?  Clients almost always have 
"stub resolvers", which do not implement iteration by themselves.  They 
send queries with the Recursion Desired flag set, and depend on the 
server to perform recursion to look up remote names.

Barry Margolin, barmar at alum.mit.edu
Arlington, MA
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