timeout retrying without EDNS master

Justin T Pryzby justinpryzby at users.sourceforge.net
Tue Oct 28 20:32:11 UTC 2008


On Tue, Oct 28, 2008 at 09:48:58PM +0200, Emil Natan wrote:
> On Tue, Oct 28, 2008 at 3:50 AM, Kevin Darcy <kcd at chrysler.com> 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).

Justin


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