[Pdns-users] Why prefer recursor answers over auth Authoritative answers?

David Sparks dave at ca.sophos.com
Fri Feb 6 22:31:06 UTC 2009

Sean Boran wrote:
> Hi,
> I cannot answer the recursive query, but I'm am also designing a setup
> to replace Bind with split zones. The idea was to replace bind entirely.
> Maybe we should share some design ideas?

Sure, my setup is a bit different.  I am setting up dns for a company lan that
has segments in 6 countries.  I am using powerdns only for internal dns, the
external dns is handled by different servers.

powerdns port 53, geo and mysql backends
custom geo-ip-map-zonefile that maps rfc1918 internal addresses to countries
mysql backend provides internal ips of split horizon zone

recursor localhost port 53 for resolving internet addresses

expected load is 2000 queries per second (60% of queries are for internal hosts)

I have some more questions if anyone can help please:

The mysql backend only has 50% key efficiency, that means one of the queries
it makes is using a non-indexed column.  Is this intentional?

What are common values for distributor-threads?

If distributor-threads is set too low and is stalling powerdns will there be a
message logged warning about this condition?



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