Martin Rex wrote: > > Tony Finch wrote: > > > > Murray S. Kucherawy <msk@xxxxxxxxxxxxx> 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 _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf