Markdown Version | Session Recording
Session Date/Time: 24 Jul 2025 12:30
# DTN
## Summary
The DTN working group meeting at IETF 123 covered several topics including updates on CoAP over BP, BPSEC COESA context, EID patterns, UDPCL, DTN management architecture (DTMA), BTPU, bundle-in-bundle encapsulation (Vibe), DTN architecture update, DTN reliability and a strong bundle auditing mechanism for BPSEC. The meeting also included a brief update from the IAB and AD regarding open positions and NOMCOM. A recharter discussion was deferred to the mailing list.
## Key Discussion Points
* **CoAP over BP:**
* The draft has been requested for working group adoption at the core working group, keeping DTN informed.
* Discussion regarding the payload length option and its implementation with OSCOR.
* Concerns were raised about IPN.ARPA and its potential DNS resolvability. The AD will scrub the document for potential conflicts.
* **BPSEC COESA Context:**
* Updates included adding security source to AAD.
* Ready for working group last call.
* Concern was raised about key selection based on timestamp and key rollover during bundle transit.
* **EID Patterns:**
* Focuses on the IPN scheme.
* Decision deferred as to whether a pattern syntax for DTN URI should be included.
* **Updated UDPCL:**
* Includes extensibility and segmentation capabilities.
* Requires more than one implementation and interoperability testing before standardization.
* **DTMA Updates:**
* Updates to AMM, ARI and AMP documents.
* **BTPU:**
* Segment numbering was inverted for better resource management.
* Discussion on potential changes to the header (reducing sequence number length, adding flag field).
* Proposal to reserve message types for raw bundle encapsulation.
* Plans to define how BTPU can run over Ethernet frames.
* **Bundle in Bundle Encapsulation (Vibe):**
* Proposal to remove the retransmission mechanism from B .IBE
* Proposed revision on fragmentation and reassembly strategy within Vibe.
* Operational experience from testing Vibe between ISS and ground.
* **DTN Architecture Update:**
* Motivation for updating RFC 4838 to IETF engineering stream
* Document structure borrowed from RFC 8655
* Discussion on custody transfer.
* Discussion on flattening the stack
* **DTN Reliability:**
* Informational RFC proposed to define DTN reliability holistically.
* Discussion of fault analysis, user indicators, and reliability mechanisms.
* Proposal to define classes of reliability for DTNs.
* **Strong Bundle Auditing Mechanisms:**
* A mechanism to ensure integrity by generating auditing block by the source and receipts generated by intermediate nodes.
* Concerns were raised about mixing data conveyed with security and using existing bib rather than using BRB
## Decisions and Action Items
* **CoAP over BP:** AD (Eric) to review the DNS aspects of the IPN.ARPA usage in the draft.
* **BPSEC COESA Context:** Request for last call to be made on the mailing list. Review by AD
* **EID Patterns:** Poll closed. Decision is to continue with the current draft which only includes the IPN scheme.
* **Updated UDPCL:** To remain as a possibly stable document, awaiting a second implementation and interoperability testing.
* **BTPU:** Solicit working group for ideas on using flag field.
* **Secure Advertisement and Neighborhood Discovery (SAND):** Discuss open issues on the mailing list.
* **New Security Association Draft:** Request for adoption to be made on the mailing list.
* **Safe Draft:** Request for adoption to be made on the mailing list.
* **DTN Reliability:** Post the initial personal draft to the mailing list to begin discussion.
* **Buble and Buble Encapulation:** Slides to be passed to the chairs
* **Presentations:** Chairs to distribute presentations
## Next Steps
* Continue discussion on remaining topics via the DTN working group mailing list.
* Schedule a recharter discussion on the mailing list.
* Proceed with working group last calls as appropriate.
* Authors to address feedback and comments from the working group on their respective drafts.