Re: [core] [ipwave] Adaptive RESTful Real-time Live Streaming for Things (A-REaLiST)'

Le 04/02/2019 à 20:00, Abhijan Bhattacharyya a écrit :
> Thank you Carsten for your comments. No one can speak about CoAP better 
> than you!
> 
> Alex,
> I have uploaded a new version of the draft. The links are given at the 
> end of this mail. I have indeed tried to address your concern in respect 
> to making the draft more "IPv6-relevant".
> 
> As Carsten rightly pointed out that the proposal works at the 
> application layer and is built on the foundation of CoAP, so it is 
> Layer-3 agnostic. Also, as we all know, CoAP is designed for IPv6.
> However, implementation on IPv6 may influence the process of determining 
> the maximum size of information segments. So, a new subsection has been 
> added as part of the design guidelines. The small addition reads as below:
> 
> <Quote>
> 
> 6.3. Determining the segment size
> 
>     Size of the information segment in a CoAP message should be limited by the least
>     possible MTU for the end-to-end channel. This is to ensure that there is no
>     undesired conversation state at the lower layers of the protocol stack due to
>     uncontrolled fragmentation leading to undesired explosion of traffic in the
>     network. For IPV6 network, the MTU can be determined using Path MTU Discovery
>     (PMTUD) [RFC8201] which bestows the responsibility of determining the path MTU on
>     the end-points itself.
> 
>     The size of the segment should be guided by the recommendations as specified in
>     Section 4.6 of [RFC7252].
> 
> </Quote>
> 
> I hope this will now satisfy the criterion of finding IPv6 in the draft.

Thank you very much for this valuable action.

It is very worth taking into consideration.

 From an implementation standpoint, I would like to learn whether some 
prototype features RESTful Real-time Live Streaming on IPv6, or not on IPv6.

Alex

> 
> Looping in CoRE list as well to announce the new version to the WG where 
> this draft originates.
> 
> Thank you.
> 
> URL: 
> https://www.ietf.org/internet-drafts/draft-bhattacharyya-core-a-realist-01.txt
> Status: https://datatracker.ietf.org/doc/draft-bhattacharyya-core-a-realist/
> Htmlized: https://tools.ietf.org/html/draft-bhattacharyya-core-a-realist-01
> Htmlized: 
> https://datatracker.ietf.org/doc/html/draft-bhattacharyya-core-a-realist
> Diff: 
> https://www.ietf.org/rfcdiff?url2=draft-bhattacharyya-core-a-realist-01
> 
> 
> With Best Regards
> Abhijan Bhattacharyya
> Consultant / Scientist,
> {Internet Protocols | 5G | Standardization},
> TCS Research,
> Tata Consultancy Services
> Building 1B,Ecospace
> Plot -  IIF/12 ,New Town, Rajarhat,
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> Mailto: abhijan.bhattacharyya@tcs.com <mailto:abhijan.bhattacharyya@tcs.com>
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> 
> -----"its" <its-bounces@ietf.org <mailto:its-bounces@ietf.org>> wrote: -----
> To: "Alexandre Petrescu" <alexandre.petrescu@gmail.com 
> <mailto:alexandre.petrescu@gmail.com>>
> From: "Carsten Bormann"
> Sent by: "its"
> Date: 01/31/2019 06:12PM
> Cc: "Abhijan Bhattacharyya" <abhijan.bhattacharyya@tcs.com 
> <mailto:abhijan.bhattacharyya@tcs.com>>, "Michael Richardson" 
> <mcr@sandelman.ca <mailto:mcr@sandelman.ca>>, its@ietf.org 
> <mailto:its@ietf.org>
> Subject: Re: [ipwave] Adaptive RESTful Real-time Live Streaming for 
> Things (A-REaLiST)'
> 
> "External email. Open with Caution"
> 
>  > If TCP's state machine was a bottleneck, has one tried to use UDP
>  > instead?
> 
> I think that is indeed one of the advantages CoAP brings go the table here.
> 
>  > Does CoAP work on Ethernet?
> 
> CoAP was designed to be able to run on UDP, which is on IP which in turn 
> works very well on Ethernet.
> 
>  > Does CoAP work in an end-to-end manner or does it need protocol
>  > conversion gateways?
> 
> I works end-to-end (as long as your network doesn’t break UDP).
> 
>  > I want to ask you: please use IPv6 for CoAP and RESTful.
> 
> CoAP was designed to work well over IPv6 (but works as well over IPv4).
> 
>  > Then I searched for the keyword ‘IPv6' in the draft.
>  > […]
>  > If you add ‘IPv6' considerations to it, then I will comment on it.
> 
> For a CoAP application such as A-REaLiST, IPv6 makes little difference 
> (beyond being able to assign addresses to both ends in the first place), 
> so I don’t know there is a lot to say.
> 
> Grüße, Carsten
> 
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> 
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