Moin!
On 20 Nov 2025, at 15:11, Peter Thomassen via Datatracker wrote:
> Subject: WG Last Call: draft-ietf-dnsop-3901bis-07 (Ends 2025-12-04)
>
> This message starts a 2-week WG Last Call for this document.
I support publication of this document.
There is one thing though that I may not have fully understand in section 3.2
and would like to have explained or expanded on:
DNS-over-TCP packets requiring fragmentation
If DNS resolution over UDP fails, or if a packet exceeds the
communicated
EDNS(0) size, a resolver should fall back to DNS resolution over TCP.
Now this is no normative language, in a section that describes conditions and
not actions but I’m not aware of a resolver that if it encounters a timeout
(which is the UDP failure case) retries the same target with TCP. While it is
possible that such software exists I don’t think doing so is a good advice and
IMHO beyond the scope of this document. I think what the authors wanted to say
that it is possible that DNS communication can come over TCP and can also have
problems so for that maybe the following wording is better:
A resolver can for various reasons also initiate connections via TCP for
resolution to an authoritative server.
Now if something else was meant by this section please explain.
So long
-Ralf
---
Ralf Weber
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