Session Date/Time: 24 Jul 2025 10:00

dnssd

Summary

The DNSSD working group met to discuss charter updates, multiple Q types document status, Time Since Received (TSR) open issues, advertising proxy issues, and potential improvements to DNS SIG(0). Key accomplishments include the recent publication of SRP and update lease as RFCs in October 2024. The group reviewed numerous technical issues for TSR and advertising proxy documents, with plans to continue discussions on the mailing list.

Key Discussion Points

Charter Update

Current charter is 6 years old with 300+ words that need refreshing
New charter will cover active documents and maintenance of existing protocols
Suggestion to complete multiple Q types document before rechartering to simplify the process
Need to include scope for protocol maintenance and quality improvements discovered during implementation

Multiple Q Types Document

Document is ready for last call
Outstanding issues from Tommy Jensen need resolution
Process will continue with shepherd write-up and AD review

Time Since Received (TSR) Issues

Document converted from XML to Markdown format for easier contributions
Major focus on terminology clarification and harmonization
Key terminology issues:
- Unifying "requester" vs "registrant" usage (recommendation to use "registrant")
- Defining MDNS registrar, SRP registrar, and their relationships
- Clarifying local vs remote entity roles
Technical issues discussed:
- Device switching network interfaces (mesh to Wi-Fi) and service registration conflicts
- Probe optimization when information already exists in cache
- Handling incomplete data split across multiple MDNS packets
- Using time of receipt vs time of processing for timestamps

Advertising Proxy Issues

Resolved QD count issue
TTL value considerations need clarification beyond standard MDNS advice
Decision: Remove complex subdomain hierarchy solution for name conflicts due to compatibility issues with applications like Matter
Decision: Change link-local address advertisement from "must always advertise" to "must not advertise" when link cannot be determined
SRP replication authority state considerations for when to advertise

DNS SIG(0) Improvements

Donald Eastlake presented potential improvements to RFC 2931
Current draft (2931bis) adds error field, ID field via EDNS option, forwarding server handling, and multiple SIG(0) support
Show of hands indicated interest in working on SIG(0) improvements
Question raised about charter scope for this work

Decisions and Action Items

Decisions Made

Remove complex subdomain hierarchy text from advertising proxy document for name conflict resolution
Change link-local address advertisement requirement from "must" to "must not" when link cannot be determined
Use "registrant" terminology consistently instead of mixing "requester" and "registrant"

Action Items

Tommy Jensen to clarify his outstanding issues with multiple Q types document
Chairs to follow up on multiple Q types shepherd write-up and AD review process
ESCO to continue terminology clarification work on TSR document
Working group members to review TSR technical issues on GitHub and provide feedback on mailing list
Resolve advertising proxy issues through mailing list discussions
Continue DNS SIG(0) improvement discussions (charter scope to be determined)

Next Steps

Multiple Q types document to proceed through final IETF publication process
TSR document editing to continue with terminology improvements and technical issue resolution
Advertising proxy document to be updated based on decisions made
Charter update process to begin, incorporating lessons learned and future work scope
Follow-up presentation on full service DNSSD server at SNACK meeting (side meeting cancelled)
Continue technical discussions on mailing list for all open issues