Clients get DNS timeouts because ipv6 means more queries for each lookup

Bill Owens owens at
Thu Jul 21 21:01:52 UTC 2011

On Mon, Jul 11, 2011 at 04:06:42PM -0400, Bill Owens wrote:
> On Mon, Jul 11, 2011 at 02:11:57PM -0400, Jonathan Kamens wrote:
> > The number of DNS queries required for each address lookup requested by 
> > a client has gone up considerably because of IPV6. The problem is being 
> > exacerbated by the fact that many DNS servers on the net don't yet 
> > support IPV6 queries. The result is that address lookups are frequently 
> > taking so long that the client gives up before getting the result.
> I've seen the same thing, and poked around enough to see that the Wikipedia name servers are returning the wrong authority info for these and other queries (it isn't just AAAA - try TXT, SRV, etc.) Some digging through the archives finds this:
>  in which the first sentence says it all: "The nameservers for are broken."
> And this followup:
>  "It's PowerDNS 2.9.22 that is breaking this, and it will be fixed by 
>  PowerDNS 3.0 once that's released, and we get around to deploying it."
> Looks like PowerDNS was in RC2 as of April 19, not released yet. . .

Updating that - according to Bert Hubert (via Twitter): 
"Friday the 22nd is... PowerDNS Authoritiative Server 3.0 release day!"


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