On Tue, Oct 28, 2008 at 09:48:58PM +0200, Emil Natan wrote:
> On Tue, Oct 28, 2008 at 3:50 AM, Kevin Darcy wrote:
> > Emil Natan wrote:

> Thanks for your answer Kevin. Today I found the problem (two different
> connectivity problems actually). You are right about the EDNS behaviour,
> there are 3 attempts to use EDNS and 3 attempts without using EDNS. I found
> it a bit strange after 6 unsuccessful queries for the zone SOA to try IXFR
> or AXFR for the zone's data. It was successful in this case and that's what
> confused me.

Zone transfers always use TCP, while typical DNS queries use UDP (and
fall back to TCP if they're large and the result is truncated).