On Apr 29, 2013, at 6:50 AM, bert hubert <[email protected]> wrote:

> If BIND experiences a timeout on a query for a domain, it assumes this might
> be because of EDNS0 compatibility issues, and retries without EDNS0.
> 
> BIND does this even for domains for which it wants to do validation.  Since
> it does not get RRSIGs if it does not use EDNS0, it declares all future
> answers bogus.  Unbound does not do EDNS0 fallback for domains for which it
> has seen a trust anchor or DS.

Retrying queries without EDNS0 seems sensible before deployment of DNSSEC. Is 
that still the case now that DNSSEC is more widely deployed? 

--Paul Hoffman
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