Re: [Anima-bootstrap] 6tisch join -01 documented posted

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 14 November 2016 19:28 UTC

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To: Michael Richardson <mcr+ietf@sandelman.ca>, 6tisch-security <6tisch-security@ietf.org>, anima-bootstrap <anima-bootstrap@ietf.org>
References: <20351.1476971471@obiwan.sandelman.ca> <0343d14c-5b18-b821-c9ad-d77fb7dae490@gmail.com> <12808a8a-5de1-c6cb-3f96-945573041ee4@gmail.com> <24910.1479078501@dooku.sandelman.ca> <efb2a1b9-a5b2-9e38-abd5-1c8031d9f1cd@gmail.com> <5562.1479107882@dooku.sandelman.ca>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Tue, 15 Nov 2016 08:28:25 +1300
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Subject: Re: [Anima-bootstrap] 6tisch join -01 documented posted
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On 14/11/2016 20:18, Michael Richardson wrote:
> 
> Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>     >> > 3. Mini-question, is this really IPv6-specific? If not I'd prefer a
>     >> > name that flags it as an AN infrastructure objective, e.g. "AN_Join"
>     >>
>     >> okay.  The problem in 6tisch for proxy<->registrar communication
>     >> (admission control) is the TCP stack required.
> 
>     > Right. I've been assuming that a "BRSKI-COAP" method is available, and
>     > if we use GRASP Flood, no TCP is needed at the pledge side.
> 
> BRSKI-CoAP lets us do the *ENROLLMENT* over CoAP, not the discovery.

Yes, understood, my point was that since Flood is UDP, the pledge doesn't
need to do anything but listen for LL multicasts - no actual discovery
is neeeded. That seems like a bonus for pledges.

> These are the interactions, and I will try to give some names to the various
> interactions in a future document, but suggestions most welcome.
> 
> 1) pledge <-> Join Assistant (JA)
>    Discovery of JA:   mDNS and/or M_FLOOD

Is Join Assistant the agreed terminology (instead of Proxy)?
> 
> 2) Join Assistant *discovery* of Registrar
>    in 6tisch, omitted, will be provisioned
>    in ANIMA, uses GRASP M_DISCOVERY

Is it permissible for the Registrar to act as its own Join Assistant
for on-link neighbors? (I can't see why not.)

> 
> 3) Join Assistant tentative admission control (used in 6tisch, to provide
>    {optional?} "move along" feedback.).
>    6tisch, currently M_REQ_NEG/M_END over *TCP*, need to be fixed.
> 
> 4) pledge <-> Registrar.
>    in ANIMA, this is pledge---TCP/HTTPS---> Registrar (RFC7030)
>    in 6tisch-zero-touch, this is Registrar ---CoAP/DTLS--> pledge [maybe EDHOC]
>                    (CoMI: draft-ietf-netconf-keystore-00 )
>    in 6tisch-minimal-security, this is pledge-->CoAP/EDHOC--> Registrar
> 

Thanks, a useful summary.

   Brian