Session Date/Time: 21 Jul 2025 10:00

panrg

Summary

This PanRG meeting at IETF 123 featured a presentation by Tillman Zeshke on guidelines for running QUIC multipath over SCION, highlighting benefits, challenges, and security considerations. Nicola provided a quick update on the status of the SCION core specification drafts and their progress through the IESG review process. The meeting concluded with a brief open mic session.

Key Discussion Points

QUIC Multipath over SCION Guidelines:
- Tillman Zeshke presented a draft outlining guidelines for QUIC multipath implementations over SCION.
- Benefits include path metadata utilization (latency, bandwidth), disjoint path selection for redundancy, and simplified congestion control.
- Challenges revolve around network address uniqueness (ISD-AS number, IP, port), path ID management, and path lifecycle within SCION libraries.
- Security considerations were discussed, particularly regarding path validation and server-side state management.
- The presentation prompted discussion on whether the draft should be SCION-specific or more general to address other path-aware networking technologies.
QUIC and Path Awareness:
- Lucas Pardue raised the point that standard QUIC (RFC 9000) already has a notion of multi-path through connection migration and wondered how much of the guidelines apply to this base functionality.
- The discussion considered whether the draft could address considerations for QUIC operating over different path-aware networks.
- It was suggested that the presenter contact the QUIC working group and the multi-path QUIC draft authors.
SCION Core Specification Update:
- Nicola provided an update on the SCION core specification drafts, which are currently undergoing IESG review.
- Recent updates include addressing feedback from a control plane review, standardizing SCION number representation, updating the SCION number registry reference, and mandating an unspecified interface ID.
- Ongoing work includes clarifying the use of gRPC (protocol buffer definitions) and security considerations, adding metadata extensions, and clarifying MTU handling within SCION paths.

Decisions and Action Items

Action Item: Tillman Zeshke will contact the QUIC working group and the multi-path QUIC draft authors for feedback on the QUIC multipath over SCION guidelines draft.
Decision: The usefulness of signing SCION to improve quick multipath was noted.
Action Item: Nicola will seek further reviews on the SCION core specification drafts, particularly focusing on the ongoing work areas.

Next Steps

Tillman Zeshke will revise the draft based on feedback received and further discussions with the QUIC community.
The SCION Association will continue working on the IESG review feedback and finalize the SCION core specification drafts.