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Re: [DNSOP] Priming query transport selection

Jim Reid <jim@rfc1035.com> Wed, 13 January 2010 20:34 UTC

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From: Jim Reid <jim@rfc1035.com>
To: Alex Bligh <alex@alex.org.uk>
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Subject: Re: [DNSOP] Priming query transport selection
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On 13 Jan 2010, at 20:01, Alex Bligh wrote:

>> An EDNS0 ignorant resolver MUST issue the priming query over UDP.
>
> I presume you mean DNSSEC ignorant.

That's implicit. The language was in Olafur's original text BTW...

If a resolver doesn't speak EDNS0, it can't set the DO bit. Which  
means the authoritative server isn't supposed to send back DNSSEC- 
related RRs. Unless the resolver explicitly queries for those RRtypes.  
Which seems unlikely, particularly in the context of a priming query.  
It would be very odd for a DNS implementation to be DNSSEC-aware and  
not support EDNS0. Then again, the DNS is full of all sorts of  
weirdness and bizarre implementations.

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