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Re: [dtn] custody transfer I-D

William Ivancic <ivancic@syzygyengineering.com> Fri, 23 June 2017 14:43 UTC

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Date: Fri, 23 Jun 2017 10:43:54 -0400
From: William Ivancic <ivancic@syzygyengineering.com>
To: "Burleigh, Scott C (312B)" <scott.c.burleigh@jpl.nasa.gov>, "dtn@ietf.org" <dtn@ietf.org>
Message-ID: <379FA5B9-C56F-4676-ABBB-36E7133E4093@syzygyengineering.com>
Thread-Topic: [dtn] custody transfer I-D
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Subject: Re: [dtn] custody transfer I-D
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    I’ll drop again my own perspective. There are other ways to manage reliable end-to-end: it is to do it at an upper layer. Again, IP is datagram, reliability is managed at a higher layer, at end points. 
    Current Internet deployment has shown that almost every hop-by-hop « feature » failed to be deployed. Instead, e2e is the only way to deliver it. Therefore, I’m questioning the need for custody transfer.
    
    Marc.

BINGO!  You win Marc.  

https://upload.wikimedia.org/wikipedia/commons/thumb/1/14/German_Kewpie_with_Heart_Sticker.png/220px-German_Kewpie_with_Heart_Sticker.png

If a node gets a bundle.  Isn’t it supposed to do its best to forward it?  I know there is discussion on this on the mail list – probably multiple times.  Custody adds a warm fuzzy, but, in reality, does little to help and only creates complexity.  I suspect it is there from a “Space” perspective because of the history of how those systems operate.  Remember, DTN bundling has its origins in CFDP.

http://public.ccsds.org/Pubs/727x0b4.pdf


------------
Will

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