[dtn] DTN neighbor messaging and neighborhood discovery
Brian Sipos <BSipos@rkf-eng.com> Fri, 12 March 2021 03:45 UTC
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From: Brian Sipos <BSipos@rkf-eng.com>
To: "dtn@ietf.org" <dtn@ietf.org>
Thread-Topic: DTN neighbor messaging and neighborhood discovery
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Date: Fri, 12 Mar 2021 03:45:20 +0000
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Subject: [dtn] DTN neighbor messaging and neighborhood discovery
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All, While looking at UDPCL and DTN-IPND [1] in the context of MANET NHDP [2], I put some working notes in the form of an RFC draft document [3] and a generated HTML [4]. The core of this notion is that there is a new well-known EID "dtn:~neighbor" which is used for next-hop messaging, ideally over UDP/IP (or some other) multicast transport. The benefit of doing neighbor messaging and neighborhood discovery at/above the BP layer is that it isolates a potential DTN NHDP from the specific CL used to multicast the bundles. This would allow discovering 2-hop neighborhood which spans a non-IP DTN-capable link. Also, some of the messaging and bookkeeping required by MANET NHDP is already solved by BP (hop counting, limited bundle lifetime, BPSec integrity). If this seems worth digging into (either neighbor messaging and/or a NHDP) I can submit this as an individual I-D. It's not yet fully baked but does cover the same ground as IPND in a way that avoids custom encoding and avoids duplication of BP-provided behavior. [1] https://tools.ietf.org/html/draft-irtf-dtnrg-ipnd-03 [2] https://tools.ietf.org/html/rfc6130 [3] https://github.com/BSipos-RKF/dtn-neighbor-msg/blob/main/spec/draft-sipos-dtn-neighbor-msg.xml [4] https://github.com/BSipos-RKF/dtn-neighbor-msg/suites/2226807647/artifacts/46129908