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Re: [dtn-interest] Bad Clock Vs. Clock rating (0)

<l.wood@surrey.ac.uk> Mon, 16 May 2016 01:25 UTC

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From: l.wood@surrey.ac.uk
To: dtn-interest@irtf.org, nikansell00@gmail.com, shyambs85@gmail.com
Thread-Topic: [dtn-interest] Bad Clock Vs. Clock rating (0)
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Date: Mon, 16 May 2016 01:25:07 +0000
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Archived-At: <http://mailarchive.ietf.org/arch/msg/dtn-interest/QVjLzjGXVIa34JJP1F1wtHVdyaE>
Subject: Re: [dtn-interest] Bad Clock Vs. Clock rating (0)
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Five years ago we pointed out the fundamental problems with the bundle protocol's reliance on clocks and synchronization in our 'A Bundle of Problems' paper.


http://personal.ee.surrey.ac.uk/Personal/L.Wood/dtn/bundle.html

http://dx.doi.org/10.1109/AERO.2009.4839384


People are still trying to use it and work around its clocking? As Australians say: so tragic.
<http://dx.doi.org/10.1109/AERO.2009.4839384>



Lloyd Wood
http://about.me/lloydwood
________________________________
From: dtn-interest <dtn-interest-bounces@irtf.org> on behalf of Nik Ansell <nikansell00@gmail.com>
Sent: Wednesday, 11 May 2016 2:07:49 PM
To: dtn-interest@irtf.org
Subject: Re: [dtn-interest] Bad Clock Vs. Clock rating (0)

A good way to get in touch with the IBR-DTN guys is to use the mailing list below.

ibr-dtn@ibr.cs.tu-bs.de<mailto:ibr-dtn@ibr.cs.tu-bs.de>

The main admin page for the mailing list is here: https://mail.ibr.cs.tu-bs.de/mailman/listinfo/ibr-dtn

Kind Regards,
Nik

On Tue, May 10, 2016 at 11:00 PM, <dtn-interest-request@irtf.org<mailto:dtn-interest-request@irtf.org>> wrote:
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Today's Topics:

   1. Re: Bad Clock Vs. Clock rating (0) (Joerg Ott)


---------- Forwarded message ----------
From: Joerg Ott <jo@netlab.tkk.fi<mailto:jo@netlab.tkk.fi>>
To: Shyam B <shyambs85@gmail.com<mailto:shyambs85@gmail.com>>, dtn-interest@irtf.org<mailto:dtn-interest@irtf.org>
Cc: kfall@kfall.com<mailto:kfall@kfall.com>
Date: Tue, 10 May 2016 07:19:16 +0200
Subject: Re: [dtn-interest] Bad Clock Vs. Clock rating (0)
I wo?ld ask the IBR-DTN folks...

On 10.05.16 01:37, Shyam B wrote:
Hello All,

Thanks for the evolving community of DTN. I hope someone can help me
with the questions below:

How to remove time synchronization between nodes on later versions of
IBRDTN:
We are using the latest version(s) of IBRDTN on OpenWRT. I read from the
change log "Version 1.0.1 (2015-02-24)" that BAD CLOCK has been replaced
by something called clock rating (set to 0).

1) I would like to know where and how can I set this clock rating to 0
on a node? Is it to be set in the "ibrdtn.conf" file or somewhere else -
any specifics will be helpful.

2) I believe this will need to be set "on each node" and the dtnd daemon
would read this during its initiation at run-time to bypass any clock
synchronization needed to receive bundles/ as well as dtnping, am I right?

NOTE: We do not require clock synchronization to keeping our scenarios
simple. Just need a way to pass bundles between nodes "under any
circumstance".

Reference:
https://trac.ibr.cs.tu-bs.de/project-cm-2012-ibrdtn/wiki/changelog

Thanks for your time. Hope someone can help us soon!

--
Regards,
Shyam, B




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