Updated DATAGRAM -03 draft

[Tommy Pauly <[e-mail]>]

Hello all,

We’ve updated the QUIC DATAGRAM draft to incorporate some of the feedback we received at the side meeting in Prague. Notably, it clarifies:

- Guidance around datagram acknowledgements
- Datagrams do not participate in any flow control
- Datagrams do participate in congestion control

The remaining area of open discussion is around the newly re-named optional “flow identifiers”. The primary argument for removing these is that applications can add identifiers onto datagrams themselves, and the transport should not transmit a field that it does not do anything with. We did add some text clarifying that these identifiers are essentially like UDP ports for demultiplexing, and pointed out some *minimal* things the transport can do to help batch transmission of datagrams in the same flow and promote fate-sharing within a flow. There’s been some discussion on Slack of other approaches that would make these flow IDs more first-class citizens—adding reliable signaling for opening and closing flows, as many applications would also generally need some similar sort of control channel—but these seem a bit heavy-weight. Either way, this is an area where discussion is welcome and I expect the document to change.

Best,
Tommy

> Begin forwarded message:
> 
> From: [e-mail]
> Subject: New Version Notification for draft-pauly-quic-datagram-03.txt
> Date: July 6, 2019 at 6:30:01 PM PDT
> To: Eric Kinnear <[e-mail]>, David Schinazi <[e-mail]>, Tommy Pauly <[e-mail]>
> 
> 
> A new version of I-D, draft-pauly-quic-datagram-03.txt
> has been successfully submitted by Tommy Pauly and posted to the
> IETF repository.
> 
> Name:		draft-pauly-quic-datagram
> Revision:	03
> Title:		An Unreliable Datagram Extension to QUIC
> Document date:	2019-07-06
> Group:		Individual Submission
> Pages:		8
> URL:            https://www.ietf.org/internet-drafts/draft-pauly-quic-datagram-03.txt
> Status:         https://datatracker.ietf.org/doc/draft-pauly-quic-datagram/
> Htmlized:       https://tools.ietf.org/html/draft-pauly-quic-datagram-03
> Htmlized:       https://datatracker.ietf.org/doc/html/draft-pauly-quic-datagram
> Diff:           https://www.ietf.org/rfcdiff?url2=draft-pauly-quic-datagram-03
> 
> Abstract:
>   This document defines an extension to the QUIC transport protocol to
>   add support for sending and receiving unreliable datagrams over a
>   QUIC connection.
> 
> 
> 
> 
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