Session Date/Time: 24 Jul 2025 12:30

quic

Summary

This meeting covered a wide range of QUIC-related topics, including multipath, extended key update, address discovery, ACK frequency, timestamp accuracy, QUIC stream multiplexing (QMux), deadline-aware QUIC streams, optimistic acknowledgement attacks, and instant acknowledgements. Discussions focused on resolving open issues in existing drafts and exploring potential directions for future QUIC extensions.

Key Discussion Points

QLog: Updates on resolving open issues and seeking implementer feedback on usage.
Reliable Resets: Awaiting implementer interest and planning for working group last call.
Load Balancers: Still gathering deployment experience.
QMux (QUIC Stream Multiplexing):
- Review of June interim meeting and proposed charter modification.
- Discussion on security implications of QMUX over insecure streams.
- Exploration of various potential wire protocols including web transport over H1/H2, and native QUIC frame approaches.
- Discussion on the relative merits of code reuse versus performance considerations for wire protocol selection.
Multipath:
- Progress on addressing working group last call comments, including renaming status frames and error codes.
- Discussion on proposed new error codes (communication failure, poor performance, timeout) and potentially renaming past unstable.
- Decision to remove vague guidance on uncoordinated path abandonment.
- Discussion on token handling for multiple addresses and consideration of a formal consensus call.
Extended Key Update:
- Updates on synchronization with TLS extended key update work.
- Emphasis on the normative dependency on TLS and the importance of formal analysis.
Address Discovery: Near completion, awaiting merge of editorial PRs.
ACK Frequency:
- Discussion on handling of previously missing packets and potential changes to immediate ACK behavior.
- Clarification that current draft does not change the behavior if you have never sent an act that reports the loss.
- Agreement that the group wants to prevent sending act after receiving every packet in reordering case.
QUIC Packet Received Timestamps:
- Discussion on coexistence mechanisms for multiple ACK frame extensions and alternative approaches, including striking RFC number from here.
Deadline-Aware QUIC Streams: Seeking feedback on interest in exploring deadline-aware streams.
Optimistic Acknowledgement Attacks: Vulnerable implementations and mitigation techniques.
Instant Acknowledgements: Discussion of the potential performance implications (both positive and negative) in different scenarios.

Decisions and Action Items

Multipath:
- Remove guidance on uncoordinated path abandonment.
- Authors to follow up with Martin Thompson on token handling.
- Consider formal consensus call on the token handling issue.
- Submit a new version after the meeting to resolve the issues.
- A short final working group last call will be done once the issues are resolved
ACK Frequency:
- Authors to create PR to fix sending act after receiving every packet in reordering case
- Further investigation/discussion is needed to fully resolve the immediate ACK behavior.
QUIC Packet Received Timestamps:
- Nuke the stuff about the RFC number thing and make it clear about how this extension coexists with multi-path.
New Issue
- Mia Kulavind to open a new issue to redesign the frame for multi path extensions.
QMux:
- Clarify that option D is in the new charter
- Authors will ensure consensus is confirmed on the list

Next Steps

Authors to revise drafts based on meeting discussions.
Working group to follow up on open issues on the mailing list.
AD to proceed with IESG ballot on the charter modification.
Working group to consider adoption of QMUX work after charter modification.
Coordinate with TLS working group on extended key update standardization.
Consider working group last calls for drafts with resolved issues.