Couple notes:

--
In Section 3.1.

> Missing GLUE:

You might want to reference RFC 9471 here[1].
--
Nit:
>   Note: To prevent name space fragmentation zone validation processes
> SHOULD ensure that:

replace with

>   To prevent name space fragmentation, zone validation processes
> SHOULD ensure that:
--
Consider adding Implementation Section - at least BIND 9 has dual-stack-servers
option 
(https://bind9.readthedocs.io/en/v9.20.15/reference.html#namedconf-statement-dual-stack-servers)
that provides means for a DNS resolver to reach the other family by falling back
to the configure upstream resolver. I am pretty sure nobody except Mark knows
about this :), so it might be useful to mention this (otherwise it is just a 
dead code).

1. although the document itself needs to be updated because of 
CVE-2025-40778[2] which basically limits glue to in-domain
2. https://kb.isc.org/docs/cve-2025-40778 and 
https://gitlab.isc.org/isc-projects/bind9/-/issues/5414
--
Ondřej Surý (He/Him)
[email protected]

> On 2. 11. 2025, at 14:02, Tobias Fiebig <[email protected]> 
> wrote:
> 
> Moin,
> 
> we just submitted an updated -05 of the document, which includes some
> typo fixes, as well as the changes to the BCP14 language on address
> synth. discussed on the list.
> 
> With best regards,
> Tobias
> 
> On Sun, 2025-11-02 at 10:59 -0800, [email protected] wrote:
>> A new version of Internet-Draft draft-ietf-dnsop-3901bis-05.txt has
>> been
>> successfully submitted by Momoka Yamamoto and posted to the
>> IETF repository.
>> 
>> Name:     draft-ietf-dnsop-3901bis
>> Revision: 05
>> Title:    DNS IPv6 Transport Operational Guidelines
>> Date:     2025-11-02
>> Group:    dnsop
>> Pages:    14
>> URL:     
>> https://www.ietf.org/archive/id/draft-ietf-dnsop-3901bis-05.txt
>> Status:   https://datatracker.ietf.org/doc/draft-ietf-dnsop-3901bis/
>> HTML:    
>> https://www.ietf.org/archive/id/draft-ietf-dnsop-3901bis-05.html
>> HTMLized:
>> https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-3901bis
>> Diff:    
>> https://author-tools.ietf.org/iddiff?url2=draft-ietf-dnsop-3901bis-05
>> 
>> Abstract:
>> 
>>    This memo provides guidelines and documents Best Current Practice
>> for
>>    operating authoritative DNS servers as well as recursive and stub
>> DNS
>>    resolvers, given that queries and responses are carried in a mixed
>>    environment of IPv4 and IPv6 networks.  This document expands on
>> RFC
>>    3901 by recommending that authoritative DNS servers as well as
>>    recursive DNS resolvers support both IPv4 and IPv6.  It
>> furthermore
>>    provides guidance for how recursive DNS resolver should select
>>    upstream DNS servers, if synthesized and non-synthesized IPv6
>>    addresses are available.
>> 
>>    This document obsoletes RFC3901. (if approved)
>> 
>> 
>> 
>> The IETF Secretariat
>> 
> 
> -- 
> Dr.-Ing. Tobias Fiebig
> T +31 616 80 98 99
> M [email protected]
> 
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