[Sis-dtn] IP networking within DTN-based protocol architectures

Sat Mar 9 15:51:13 UTC 2024

Yes generally speaking

On Sat, Mar 9, 2024, 10:43 <sburleig.sb at gmail.com> wrote:

> I think we get closer to BSD/POSIX if we use UDP as a model.  The
> attenuated UDP notion of connect() would work for BP, I think.
>
>
>
> Scott
>
>
>
> *From:* SIS-DTN <sis-dtn-bounces at mailman.ccsds.org> *On Behalf Of *Jeremy
> Mayer via SIS-DTN
> *Sent:* Saturday, March 9, 2024 12:35 AM
> *To:* vint at google.com; Tomaso.deCola at dlr.de
> *Cc:* sis-dtn at mailman.ccsds.org
> *Subject:* Re: [Sis-dtn] IP networking within DTN-based protocol
> architectures
>
>
>
> Hi,
>
> I’m tempted to agree. I’ve seen limited utility in IP->BP encap, as (other
> than some unidirectional UDP-based applications), the assumptions made in
> IP networks (especially TCP) do not scale well to DTN environments. The two
> largest issues I see are:
>
>    1. The assumption that relatively low-latency and bidirectional
>    communication is available.
>    2. The layering of stream and message-based semantics.
>
>
>
> Almost every TCP-ish application which I’ve seen run over BP winds up with
> exceptionally low performance, unless some sort of PEP is integrated, which
> adds complexity, failure points, and fragility.
>
>
>
> +1 for the notion of a standard API though, with the additional caveat
> that we should standardize nomenclature across implementations. We could
> likely reuse about 80% of the BSD/POSIX interface for BP, with the notable
> exception of connect.
>
>
>
> Thanks,
>
> Jeremy
>
>
>
> *From:* SIS-DTN <sis-dtn-bounces at mailman.ccsds.org> *On Behalf Of *Vint
> Cerf via SIS-DTN
> *Sent:* Freitag, 8. März 2024 12:31
> *To:* de Cola, Tomaso <Tomaso.deCola at dlr.de>
> *Cc:* sis-dtn at mailman.ccsds.org
> *Subject:* Re: [Sis-dtn] IP networking within DTN-based protocol
> architectures
>
>
>
> The more I think about this, the less I like trying to manage off-Earth IP
> networks remotely. I think I would much rather see native applications
> running over BP. In any case we need to develop standard APIs for BP, such
> as the Sockets interface for Linux/Unix/Posix.
>
>
>
> We do need to figure out how IP-based and BP-based applications interwork.
> What do Domain Names mean in the BP context for example.
>
>
>
> v
>
>
>
>
>
> On Fri, Mar 8, 2024 at 4:24 AM Tomaso de Cola via SIS-DTN <
> sis-dtn at mailman.ccsds.org> wrote:
>
> Dear All,
>
>
>
> as mentioned yesterday during our DTN weekly, during the past Fall meeting
> a presentation was given by University of Nanjing with the support of
> Chinese agency about IP-networking within DTN-based protocol stacks,
> especially for planetary network segments (i.e. what is often referred to
> as IP-islands).
>
> The link to that presentation is as follows:
>
>
>
>
> https://cwe.ccsds.org/sis/docs/SIS-DTN/Meeting%20Materials/2023/Fall%202023%20SIS-DTN/Possible%20BOF%20Discussion.pptx?d=w44d31f0b3be649e4bf24ec4ae50479a1
>
>
>
> The proposal made there was for a BOF (i.e. towards a WG formation), which
> I see however too premature. On the contrary, I’d be more in favour for a
> SIG (Special Interest Group), happening outside the DTN WG.
>
>
>
> As discussed yesterday, key points to clarify/agree are:
>
>
>
>    1. Is the proposal sound and meaningful to be addressed?
>    2. Is appropriate for the SIS area or should be better addressed at
>    architectural level in SEA (maybe it can be even a cross-area initiative)?
>    3. In the case of SIS, is there significant support to start this? In
>    other words, which agencies have interest in contributing to this activity?
>
>
>
> Thank you for sharing comments/objections/suggestions.
>
>
>
> Have a nice weekend,
>
>
>
> Tomaso
>
>
>
> ————————————————————————
>
> *Deutsches Zentrum für Luft- und Raumfahrt* (DLR)
> German Aerospace Center
> Institute of Communications and Navigation | Satellite Networks |
> Oberpfaffenhofen | 82234 Wessling | Germany
>
> *Tomaso de Cola, Ph.D.* |
> *Integrated Satellite Systems (INS) Team Leader*Telefon +49 8153 28-2156
> <+49%208153%20282156> | Telefax  +49 8153 28-2844 <+49%208153%20282844> |
> tomaso.decola at dlr.de <sandro.scalise at dlr.de>
> http://www.dlr.de/kn/institut/abteilungen/san
>
>
>
>
>
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>
> --
>
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>
> Vint Cerf
>
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>
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>
>
>
>
>
> until further notice
>
>
>
>
>
>
>
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