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Re: provisioning software, was DNS RRTYPEs, the difficulty with

2012-03-08 14:57:41
Martin Rex wrote:

Tony Finch wrote:

Murray S. Kucherawy <msk(_at_)cloudmark(_dot_)com> wrote:

I looked at least at the titles of all the documents that update 1035,
and none of them appear to be related to the above.  So where should we
be looking?

The only thing I have found that implies NOTIMP doesn't apply to queries
for unknown RR types is in RFC 4074, "Common Misbehavior Against DNS
Queries for IPv6 Addresses":

Thanks for mentioning rfc 4074.  The stuff in that document matches
the thoroughly broken behaviour of the IPv6 DNS resolver client of
Windows 2003 that I had encountered just recently.

IMO, rfc4074 exhibits a significant amount of cluelessness about DNS,
the "Full Standard" document maturity level, and the realities of
backwards compatibilities for an incredibly huge installed base.


The answer to the question "what can I infer from a failed AAAA lookup"
must be deduced from STD 13 **ALONE**, and it amounts to "very close to
nothing at all".

In case this isn't clear:  this applies to DNS responses with one of
the failure RCODEs (1,2,3,4,5) defined in rfc1035 _unless_ the response
is accompanied by some protocol extension that can be used to **reliably**
distinguish 1034/1035 DNS responders from those conforming to a later,
optional DNS protocol extension.


-Martin
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