[Ndn-interest] NDN–CCN Convergence (differences from CCNx 1.0)

[Kyra]

On Fri, Apr 25, 2025 at 3:41 PM David R. Oran <daveoran at orandom.net> wrote:

> Others may have different views, but for me the fundamental barrier that
> prevented convergence of the two protocols (which are extremely similar
> other than packet encoding) was that the IRTF and IETF rules require that
> change control reside with the IRTF. The NDN community was not willing to
> take that step.
>

Thanks for this context, someone on the ICNRG mailing list added the reason
for this is specifically that:

On Fri, Apr 25, 2025 at 3:45 PM Junxiao Shi <shijunxiao at arizona.edu> wrote:

> In terms of code, NDN forked from CCNx 0.x, due to PARC's patent claims at
> the time being incompatible with NSF's open requirements.
>
[…]
>
> The convergence effort did not proceed because CCN wanted a stable
> protocol suitable for commercialization, while the NDN team wanted to focus
> on research and did not have the manpower for standardization.
> Nowadays, the NDN team is focusing on security and decentralized
> applications, while CCN is focusing on operating large networks and gaining
> higher performance.
>

But both security & decentralization as well as stability & standardization
seem vital, especially as the initial convergence effort was motivated by
the concern that it is:

> Not a healthy signal for ICN if we keep developing two different,
> incompatible sets of specs (CCNx and NDN)


There must be some way to address the concerns on either side. There are
also open patent pools, and if it encourages wider support that seems to be
in Cisco's best interest too, right? I wonder if that would help reignite
the convergence efforts.


> ___________________________
> iDevice - please excuse typos.
>
> On Apr 25, 2025, at 4:17 PM, Kyra <hello at kyra.run> wrote:
>
> 
> When reading that NDN was based on CCNx, I didn't realize that meant that
> NDN is based on Xerox PARC's CCNx 0.x code, but this was acquired by Cisco
> <http://www.lists.cs.ucla.edu/pipermail/ndn-interest/2017-March/001596.html>
> and version 1.x is an ongoing project through the IRTF's Information
> Centric Networking Research Group (ICNRG
> <https://mailarchive.ietf.org/arch/msg/icnrg/oQYP7UhvVzuOmCAkwv6SmvNSYOw/>):
> https://www.irtf.org/icnrg.html
>
> There was even an effort around 2016 to work together to:
>
>> Understand and document current differences [n]ot only syntax and
>> mechanisms – also semantics and motivation for design decisions
>
> and resolve those to produce a
>
>> set of (Experimental) RFCs that represent community consensus on one
>> combined NDN/CCNx design
>
>
>    - https://www.ietf.org/proceedings/96/slides/slides-96-icnrg-7.pdf
>
>
> It looks like the convergence wiki page has been purged, and there was a
> protocol harmonization document drafted, but otherwise the meeting records
> stopped 8 years ago
>
>    -
>    https://web.archive.org/web/20220607064227/https://trac.ietf.org/trac/irtf/wiki/icnrg/convergence
>    -
>    https://icnrg.github.io/draft-icnrg-harmonization/draft-icnrg-harmonization-00.html
>    - https://github.com/icnrg/convergence/tree/master/meetings
>
> How far did those efforts go and if they have concluded, what was the
> impasse? In my last reply to the 'Understanding Named Data Networking'
> thread, I should've added this as another worthwhile comparison to publish!
>
> I was hoping to see the recording of the conference where some of this was
> discussed, but the recording links
> <https://named-data.net/2017/04/04/named-data-networking-ndn-project-newsletter-februarymarch-2017/>
> (below) are dead and even the Internet Archive's Wayback Machine snapshot
> <https://web.archive.org/web/20181111152459/https://www.caida.org/workshops/ndn/1703/>
> from the same year also shows dead links.
>
> P.S. When will the recordings of this year's NDN Community meeting go
> online? I had to work so I wasn't able to pay close attention but wanted to
> see the videos when they are available!
>
> On Thu, Mar 23, 2017 at 8:37 AM Lan Wang <lanwang at memphis.edu> wrote:
>
>> Hi all,
>
>
>
> Here’re the NDNcomm (NDN Community Meeting) 2017 live streams for today
>> and tomorrow (starting at 8:30am central):
>>
>> 3/23:
>> http://mediasite.memphis.edu/Mediasite/Play/b946b7085dea4573aba78d0425bd5fd91d
>>
>> 3/24:
>> http://mediasite.memphis.edu/Mediasite/Play/cd3596a0b235492cbc049754b8f037d71d
>>
>> Thanks,
>>
>> Lan
>>
>> ************************************************
>> Lan Wang
>> Professor & Chair
>> Department of Computer Science
>> University of Memphis
>> Memphis, TN 38152
>>
>> Phone: 901-678-1643
>> URL: http://www.cs.memphis.edu/~lanwang
>> ***********************************************
>
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