[Pdns-users] PDNS-Recursor Not Providing DNS Lookups?

Kenneth Marshall ktm at rice.edu
Fri Aug 22 18:40:05 UTC 2008

On Fri, Aug 22, 2008 at 07:42:31PM +0200, bert hubert wrote:
> On Fri, Aug 22, 2008 at 12:30:36PM -0400, Steve Chapman wrote:
> > I'm working in an environment that uses split DNS (some parentcompany.com
> > servers we want resolved from corporate DNS servers, others from Internet
> > DNS servers).  I've installed the pdns-recursor RPM (3.1.7-1) on my RHEL 5
> > bind DNS server and configured the recursor, all defaults except:
> Very good!
> > If I run an "nslookup Server2.parentcompany.com <IP of Corporate DNS
> > server>", I get a valid IP address, and then if I subsequently re-run the
> > nslookup against the PDNS Recursor, it provides the answer from then on.
> > Why isn't it providing the answer initially?  Any ideas would be helpful.
> The reason is that PowerDNS is expecting you to forward queries to an
> authoritative server.
> It appears you are forwarding them to a server that is not authoritative for
> Server2.parentcompany.com, but is in itself a caching resolver.
> PowerDNS is sending so called 'non-recursion desired' questions to your
> internal nameserver, and this internal server is therefore not recursing for
> your questions.
> Once you've triggered the internal server to look the question up, it keeps
> the answer in the cache.
> The second time PowerDNS asks, no recursion is needed, since the answer is
> there already.
> I'm not sure what to do now - it might be good for PowerDNS to set the 'rd'
> bit in forwarded queries.
> Any ideas?
I vote for setting the 'rd' bit in the forwarded queries. That certainly
best fits the behavior that I was expecting to see.


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