[Pdns-users] Multiple IPs per host name / round robin

Michael Loftis mloftis at wgops.com
Thu Feb 24 17:36:27 UTC 2011

The recursive resolver is what clients talk to "locally".  AKA a
caching resolver, it's not part of your authoritative infrastructure
at all.  In fact, if you're using your authoritative nameservers as
caching resolvers, you should stop.  For most people the recursive
resolver is provided by their ISP unless they elect to run their own
(like I do) or to use an external one (like OpenDNS or Google's DNS).
What makes them recursive is that they answer queries that aren't
necessarily in their cache or known from zone files by "recursing" up
the tree until it finds an answer it knows (either from root hints or
previous cached lookups) then works it's way "back down" the tree to
the answer.

On Thu, Feb 24, 2011 at 10:25 AM, PLists <jklists at ifm-services.com> wrote:
> Here's your DNS noob question for the day. (I'm not a real sysadmin. I only pretend to be when backed into a corner.)
> I've been running PowerDNS (with a MySQL backend) successfully and happily for a couple of years now. It's really basic stuff, one A record per host name.
> Now I'm in a situation where I need to serve up two possible IP addresses for a certain host name. From my treks through Google, I'm assuming the following:
> 1) I simply enter multiple A records into the database, one for each IP.
> 2) PowerDNS does not randomize these. [informational]
> 3) Recursors are supposed to do this. [informational]
> So all I need to do, really, is enter in the multiple A records.
> What I'm confused about is the role of the recursor. Is it already installed as part of PowerDNS? If not, do I need to install the recursor on my name servers? Does it take over port 53? From reading about recursors, the answer is, "No", I think. But I'm not completely sure when one would run a recursor.
> Thanks for making something so simple and reliable. :)
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