Re: [tsvwg] I-D Action: draft-ietf-tsvwg-udp-options-dplpmtud-09.txt

[Gorry Fairhurst <[e-mail]>]

On 03/07/2023 01:35, C. M. Heard wrote:
> On Sun, Jul 2, 2023 at 1:50 PM PDT, in the thread entitled "Remaining
> issues for draft-ietf-tsvwg-udp-options-22," Gorry Fairhurst wrote:
>> UDP Options itself doesn't generate the response, it passes the REQ
>> upwards to the protocol that does and that sends the RES option.
> However, Section 3 of  draft-ietf-tsvwg-udp-options-dplpmtud-09 says:
>
>     When DPLPMTUD is within the UDP transport service, the UDP Options
>     processing is responsible for sending probe packets to determine a
>     PLPMTU, as described in this document.
>
> It might be better to say "the DPLPMTUD State Machine" rather than "the
> UDP Options processing" to make it clear that it is the shim above UDP
> Options Transport in the figure that does this, and not UDP Options
> itself. This would help to emphasize the point that UDP Options on its
> own does not generate responses to any option.
Yes, that is better, added.
>
> The document does not describe in detail what happens when an Upper
> Layer Protocol (or application) implements DLPMTUD using UDP options.
> For me. it's easy enough to infer that the DPLPMTUD State Machine has to
> reside within the application, and that the application must initiate
> the actions to generate probe packets and responses. However, a sentence
> making that point explicit would not hurt.

It's the application/library/protocol/ or whatever uses the UDP Options,

I tried to improve that in the Editor's version.

>
> Thanks and regards,
>
> Mike Heard
Gorry
> On Thu, Jun 29, 2023 at 10:08 AM <[e-mail]> wrote:
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories. This Internet-Draft is a work item of the Transport Area Working
>> Group (TSVWG) WG of the IETF.
>>
>>     Title           : Datagram PLPMTUD for UDP Options
>>     Authors         : Godred Fairhurst
>>                       Tom Jones
>>     Filename        : draft-ietf-tsvwg-udp-options-dplpmtud-09.txt
>>     Pages           : 17
>>     Date            : 2023-06-29
>>
>> Abstract:
>>     This document specifies how a UDP Options sender implements Datagram
>>     Packetization Layer Path Maximum Transmission Unit Discovery
>>     (DPLPMTUD) as a robust method for Path Maximum Transmission Unit
>>     discovery.  This method uses the UDP Options packetization layer.  It
>>     allows an application to discover the largest size of datagram that
>>     can be sent across the network path.  It also provides a way to allow
>>     the application to periodically verify the current maximum packet
>>     size supported by a path and to update this when required.
>>
>> The IETF datatracker status page for this Internet-Draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-tsvwg-udp-options-dplpmtud/
>>
>> There is also an htmlized version available at:
>> https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-udp-options-dplpmtud-09
>>
>> A diff from the previous version is available at:
>> https://author-tools.ietf.org/iddiff?url2=draft-ietf-tsvwg-udp-options-dplpmtud-09
>>
>> Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts
>>