I agree; this is about utility, not necessity. For example, AAAA records are almost never "necessary" in glue, but they are useful, so they are glue.
On Fri, Nov 4, 2022 at 7:24 AM libor.peltan <libor.peltan= 40nic...@dmarc.ietf.org> wrote: > Hi, > > regarding the question of "necessary" versus "useful". I apologize, but > I must kind-of undermine the question. > > Imagine that a delegation is supplemented with an SVCB record that > describes how to connect securely (with TLS) to the delegated > nameserver. (Dunno if this really can happen today, but it's an > imaginable situation in general.) > > Then the SVCB is not necessary for the DNS resolution per se, but it is > necessary for the resolution to proceed securely. If the client's policy > is "privacy or nothing", then they will not proceed with the resolution > unless the SVCB is returned. As a consequence, the record is not > necessary to some clients (but may still be useful), but necessary to > others. Thus, the term necessary is relative and it can hardly be used > in the definition of glue. > > Thank you for considering my comment :) > > Libor > > Dne 03. 11. 22 v 22:48 Benno Overeinder napsal(a): > > Dear WG, > > > > With the DNSOP rfc8499bis interim in September, we had the action > > point to send two questions to the DNSOP WG to find consensus on the > > bailiwick and glue discussion. > > > > You can find the interim meeting material here > > https://datatracker.ietf.org/meeting/interim-2022-dnsop-02/session/dnsop > > and the recording of session here https://youtu.be/wY7-f40lDgU. > > > > This is the second email to the WG, focussing on the definition of glue. > > > > Questions: > > > > 2. Definition of Glue provided by Duane Wessels on the DNSOP WG mailing > > list: > > > > "Glue is non-authoritative data in a zone that is transmitted in the > > additional section of a referral response on the basis that the data > > might be necessary for resolution to proceed at the referred name > > servers." > > > > On the mailing list, we have seen a discussion about "necessary" > > versus "useful". In this context glue is defined to be exclusively > > A/AAAA records (traditional understanding), or do we also consider > > other RRtypes to be glue, e.g. SCVB/HTTPS or DS records? Concern is > > that "useful" may lead to a definition that is too broad. > > > > Taking the last point a step further: if the definition is expanded > > and glue-is-not-optional becomes a requirement then responses may grow > > in size and exceed fragmentation/truncation thresholds and lead to > > more TCP. > > > > Remark by WG during interim meeting: One might need a registry for > > RRtypes being glue (in the future). > > > > Thanks, > > > > -- Suzanne, Tim and Benno > > > > _______________________________________________ > > DNSOP mailing list > > DNSOP@ietf.org > > https://www.ietf.org/mailman/listinfo/dnsop > > _______________________________________________ > DNSOP mailing list > DNSOP@ietf.org > https://www.ietf.org/mailman/listinfo/dnsop >
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