On Tuesday, 27 April 2021, 16:58:29 GMT+10, Jon Crowcroft <[email protected]> wrote:
> DTN is also sometimes interpreted as "Disruption Tolerant Networking", > (e.g. not just delay between earth and mars, but phobos or deimos > get in the way from time to time, so ingenuity crashes without anyone > seeingg > (or in the terrestrial case, you'ree train goes into a tunel whether > there's no cell phone coverage)... In the interplanetary internet delay-tolerant networking case link loss can be planned for and scheduled into operations. Orbital mechanics are quite predictable in the short-to-medium term. Path delays are long. (and phobos and deimos don't cast large shadows...) Trains are also scheduled and run according to plan -- in most countries. When a car goes into a tunnel, however, is less amenable to planning. Disruption is, by its nature, unplanned. Path delays are shorter. A graph that attempts to represents the orthogonality of delay- and disruption-tolerant networking, and how they differ, is in fig 1 of: Sharing the dream: The consensual networking hallucination offered by the Bundle Protocol http://dx.doi.org/10.1109/ICUMT.2009.5345655 http://lloydwood.users.sourceforge.net/Personal/L.Wood/publications/index.html#e-dtn-position TCP is pretty much the default for DTN, because much development was done over TCP, it was well-understood, convenient, reliable. Transports for actual delay and disruption are far harder. Lloyd Wood http://lloydwood.users.sourceforge.net/Personal/L.Wood/dtn/ _______________________________________________ Taps mailing list [email protected] https://www.ietf.org/mailman/listinfo/taps
