[tsvwg] Re: [v6ops] Re: Carrying large DNS packets over UDP in IPv6 networks

["C. M. Heard" <[e-mail]>]

On Sun, Jun 16, 2024 at 11:57 AM Gert Doering wrote:

> On Sun, Jun 16, 2024 at 09:07:44AM -0700, Bob Hinden wrote:
>
This document is aligned with the recommendation in
> [I-D.ietf-dnsop-avoid-fragmentation], but focuses on DNS over IPv6, and
> also recommends and provides additional details on running DNS over TCP or
> QUIC.
>
>
>
>  I don't think a v6ops document should venture into DNS transport
> recommendations - especially as the question "TCP or QUIC" is, basically,
> independent of the underlying IP protocol (IPv4 fragments are not safe
> from eaten by intermediate grue).
>

+1 to that. Hence my recommendation to focus efforts on getting
[I-D.ietf-dnsop-avoid-fragmentation] published, at least as regards DNS
issues.

A more fruitful avenue for v6ops might be to encourage applications that
use transport protocols that do their own packetization (e.g., TCP, QUIC,
TLS, and DTLS) to select settings (e.g., socket options) that will avoid
IPv6 fragmentation and to encourage such transport protocols to make such
settings available to the layers above. That ultimately is what will make
it possible to implement the recommendations in
[I-D.ietf-dnsop-avoid-fragmentation]
and other such application-specific documents. Something similar may be
needed for IPv4, but the problems there are somewhat different and in any
case are not the purview of v6ops.

Respectfully,

Mike Heard