bind returns empty record first time

Ronan Flood ronan at noc.ulcc.ac.uk
Tue Apr 12 18:08:56 UTC 2005


Captain Dondo <yan at NsOeSiPnAeMr.com> wrote:

> What's a recursive query?  I know recursion, but I'm having a hard time 
> applying it to a DNS lookup... I always thought DNS queries were 
> flat-file, or store-and-forward....

A query with the Recursion Desired (rd) flag set: you can see this in
the example dig output you had, and also that the ISP servers respond
without the Recursion Available (ra) flag in the reply.

A recursive query means the client expects the server to go out and
search the DNS for the answer.  See, for example,

  http://www.zytrax.com/books/dns/ch2/#recursive

or many other docs.

-- 
                      Ronan Flood <R.Flood at noc.ulcc.ac.uk>
                        working for but not speaking for
             Network Services, University of London Computer Centre
     (which means: don't bother ULCC if I've said something you don't like)



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