On 20 Feb 2024, at 12:38, Niall O'Reilly <niall.orei...@ucd.ie> wrote:
> I think it would help, for completeness, and the better > to support the inexperienced reader of the DNS scriptures, > to include mention of RFC5936 (AXFR) in the "brief summary > of the guidance provided in the existing DNS specification" > contained in Appendix A. That is some good, arcane DNS knowledge right there, Niall, I like it! > Perhaps the following text, modelled on the existing mention > of DNS Cookies [RFC7873], would suit. > > DNS Zone Transfer Protocol (AXFR) [RFC5936] > in Section 2.2 allows an authoritative server optionally > to send a response message (QR = 1) to a standard query > (OpCode = 0) with QDCOUNT = 0, in a message which is the > second or subsequent message of a multi-message response. Perhaps it's worth making it even more clear that this is just a provision for AXFR responses by specifying the QTYPE? Something like: DNS Zone Transfer Protocol (AXFR) [RFC5936] in Section 2.2 allows an authoritative server optionally to send a response message (QR = 1) to a standard AXFR query (OpCode = 0, QTYPE=252) with QDCOUNT = 0 in the second or subsequent message of a multi-message response. Without that extra clue I had to scuttle off to look at the original text to make sure this was not some general multi-message response case introduced in a dark corner that I was not aware of. Knowing that it only relates to AXFR helped. I realise the whole paragraph spells out what the reference is to, but it surely wouldn't be the first time that some protocol-wide clarification was found hiding behind the curtain in the spare room. Joe _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
