Re: [tsvwg] I-D Action: draft-ietf-tsvwg-udp-options-31.txt

[Tom Herbert <[e-mail]>]

Hi,

I don't understand the intent of this new text:

"Another reason is because APC may fail even where the user data has
not been corrupted, such as when its contents have been overwritten.
Such overwrites could be intentional and not widely known; defaulting
to silent ignore ensures that option-aware endpoints do not change how
users or applications operate unless explicitly directed to do
otherwise."

I am not familiar with any IETF protocol that allows UDP payload to be
updated in flight. In fact, RFC7605 states that UDP port numbers
cannot be correctly interpreted in the network, so there is no way to
implement a robust protocol that changes UDP payload inflight. Because
of this, an intermediate node that is overwriting the UDP payload *is*
in fact corrupting the UDP payload. So this new provision is seemingly
accommodating this non-standard, potentially harmful behavior as the
default.

Tom

On Mon, Mar 4, 2024 at 3:56 PM <[e-mail]> wrote:
>
> Internet-Draft draft-ietf-tsvwg-udp-options-31.txt is now available. It is a
> work item of the Transport and Services Working Group (TSVWG) WG of the IETF.
>
>    Title:   Transport Options for UDP
>    Author:  Joe Touch
>    Name:    draft-ietf-tsvwg-udp-options-31.txt
>    Pages:   52
>    Dates:   2024-03-04
>
> Abstract:
>
>    Transport protocols are extended through the use of transport header
>    options. This document extends UDP by indicating the location,
>    syntax, and semantics for UDP transport layer options.
>
> The IETF datatracker status page for this Internet-Draft is:
> https://datatracker.ietf.org/doc/draft-ietf-tsvwg-udp-options/
>
> There is also an HTMLized version available at:
> https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-udp-options-31
>
> A diff from the previous version is available at:
> https://author-tools.ietf.org/iddiff?url2=draft-ietf-tsvwg-udp-options-31
>
> Internet-Drafts are also available by rsync at:
> rsync.ietf.org::internet-drafts
>
>