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From: =?utf-8?B?R8O2cmFuIFNlbGFuZGVy?= <goran.selander@ericsson.com>
To: Daniel Migault <daniel.migault@ericsson.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-core-object-security.all@ietf.org" <draft-ietf-core-object-security.all@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "core@ietf.org" <core@ietf.org>
Thread-Topic: [secdir] Secdir last call review of draft-ietf-core-object-security-14
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Date: Tue, 4 Sep 2018 07:52:55 +0000
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Subject: Re: [core] [secdir] Secdir last call review of draft-ietf-core-object-security-14
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From: Klaus Hartke <klaus.hartke@ericsson.com>
To: Core <core@ietf.org>
Thread-Topic: New Version Notification for draft-hartke-core-stateless-00.txt
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Subject: Re: [core] Upcoming virtual interim meetings (Re: CoRE@IETF102: Summary)
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For the next virtual interim meeting, which is scheduled to happen in =
about 43 hours of time, we have two items on the agenda so far:

=E2=80=94 finishing touches for draft-boucadair-core-hop-limit (I=E2=80=99=
ll issue a call for working group adoption momentarily); any other =
continuation of the previous interim
=E2=80=94 way forward with stateless proxies as needed for 6tisch, =
specifically draft-hartke-core-stateless: Approach A or B (or something =
unknown yet?)

Please speak up if you want to address other issues (but keep in mind =
that we only have 60 minutes planned).

One item that has been mentioned for the next interim after that (Sep =
26, where I, again, won=E2=80=99t be able to participate) is =
draft-ietf-core-pubsub.

Gr=C3=BC=C3=9Fe, Carsten


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It seems we have converged at draft-boucadair-core-hop-limit as the =
draft providing the hop limit function needed by DOTS, but we haven=E2=80=99=
t done the formal WG adoption yet.

This is a formal call for adoption of this draft as a WG document of the =
CoRE WG.
If you have read the draft and support adopting it, please say so.
If you see a problem with adopting it as a WG document, please tell us.
For both, remember that WG adoption does not mean that we already have =
consensus on all the details, just that this is the right working =
document to address the issue (and that we should address the issue in =
the first place).
Please do mention any issues that you already know; these also can be =
brought up in Wednesday=E2=80=99s virtual interim Webex call.

This formal WG adoption call runs until the end of September 17th.
(Given the state of the discussion, we might then have a Working Group =
last call of an updated document right next.)

Gr=C3=BC=C3=9Fe, Carsten


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From: Jim Schaad <ietf@augustcellars.com>
To: 'Carsten Bormann' <cabo@tzi.org>, 'Core' <core@ietf.org>
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I support adopting this draft.

For the set of issues - look at the last virtual minutes.

> -----Original Message-----
> From: core <core-bounces@ietf.org> On Behalf Of Carsten Bormann
> Sent: Monday, September 10, 2018 12:55 PM
> To: Core <core@ietf.org>
> Subject: [core] =F0=9F=94=94 WG adoption of =
draft-boucadair-core-hop-limit
>=20
> It seems we have converged at draft-boucadair-core-hop-limit as the =
draft
> providing the hop limit function needed by DOTS, but we =
haven=E2=80=99t done the
> formal WG adoption yet.
>=20
> This is a formal call for adoption of this draft as a WG document of =
the CoRE
> WG.
> If you have read the draft and support adopting it, please say so.
> If you see a problem with adopting it as a WG document, please tell =
us.
> For both, remember that WG adoption does not mean that we already have
> consensus on all the details, just that this is the right working =
document to
> address the issue (and that we should address the issue in the first =
place).
> Please do mention any issues that you already know; these also can be =
brought
> up in Wednesday=E2=80=99s virtual interim Webex call.
>=20
> This formal WG adoption call runs until the end of September 17th.
> (Given the state of the discussion, we might then have a Working Group =
last
> call of an updated document right next.)
>=20
> Gr=C3=BC=C3=9Fe, Carsten
>=20
> _______________________________________________
> core mailing list
> core@ietf.org
> https://www.ietf.org/mailman/listinfo/core


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From: Jim Schaad <ietf@augustcellars.com>
To: <draft-hartke-core-stateless@ietf.org>
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Section 2.2.2 - Depending on circumstances, I think you might get a Gateway
time out error response as well for some types of proxies.

Section 2.2.2 - Should there be a special indicator that a server cannot
deal with tokens of longer than n bytes?  Otherwise this would seem to be a
good way to exhaust resources on the server/proxy.

Section 3.1 - I would think that repeatable would be better for the option
as then multiple proxies could just insert a new option rather than
attempting to extend or wrap the current value.

Section 3.1 - I am not sure that I agree that the option should be unsafe to
forward.  As long as a client and a server agree to deal with the option
then it does not matter what any intermediate proxies might do.  Changing
this modifies 3.2.2 as well

Section 3.1 - above two arguments would change the values of critical as
well.  I still think that it would be part of the cache key for a proxy that
did not understand the option, it might be noted that a proxy which
understands the option would be in its right to exclude the option from
computing the cache key.

Section 3.1 - The last sentence may need to have some additional text added
about the length of the Token field when splitting the value.  Also needs to
have a note about the interactions messages in those cases where the portion
placed in the token field does not change.  This seems quite possible if one
uses a prefix.

Section 4 - What happens for interactions w/ the observe option?

Section 4.1 - I don't see how paragraph 3 follows from the use of this
option.  This is merely a tree statement for all intermediaries that don't
bother caching.  Note that if the intermediary does cache responses, but
does not cache this option then the entire paragraph does not seem to be
correct.  It could respond from the cache, but not worry about keeping this
value in the cache and trying to figure out when and how to ignore.

Security Considerations - Need additional text someplace about swapping of
tokens which might be more consequential than would normally be the case.

Someplace - Interactions between OSCORE and this new option.

Freshness indicator may need to be dealt with on a per server basis or using
the same type of window that DTLS uses.  If a client sends out two different
messages to two different servers, the order of responses should not control
if a response is processed.

Jim











From nobody Tue Sep 11 04:02:42 2018
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From: "Jon Shallow" <supjps-ietf@jpshallow.com>
To: <core@ietf.org>, "'Konda, Tirumaleswar Reddy'" <TirumaleswarReddy_Konda@mcafee.com>, <dots@ietf.org>
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Subject: Re: [core] =?utf-8?b?W0RvdHNdIEZXOiAg8J+UlCBXRyBhZG9wdGlvbiBvZiBk?= =?utf-8?q?raft-boucadair-core-hop-limit?=
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Hi CoRE WG,

I have read the draft and support it.
I do not see any issues with it being a WG document.

Regards

Jon

-----Original Message-----
From: Dots [mailto: dots-bounces@ietf.org] On Behalf Of Konda, =
Tirumaleswar Reddy
Sent: 11 September 2018 06:57
To: dots@ietf.org
Subject: [Dots] FW: [core] =F0=9F=94=94 WG adoption of =
draft-boucadair-core-hop-limit

Hi all,

Please review =
https://tools.ietf.org/html/draft-boucadair-core-hop-limit-00 and =
respond to the WG adoption call in CoRE WG.=20
DOTS signal channel is using the Hop-Limit Option defined in this draft.

Cheers,
-Tiru

-----Original Message-----
From: core <core-bounces@ietf.org> On Behalf Of Carsten Bormann
Sent: Tuesday, September 11, 2018 1:25 AM
To: Core <core@ietf.org>
Subject: [core] =F0=9F=94=94 WG adoption of =
draft-boucadair-core-hop-limit

This email originated from outside of the organization. Do not click =
links or open attachments unless you recognize the sender and know the =
content is safe.

It seems we have converged at draft-boucadair-core-hop-limit as the =
draft providing the hop limit function needed by DOTS, but we =
haven=E2=80=99t done the formal WG adoption yet.

This is a formal call for adoption of this draft as a WG document of the =
CoRE WG.
If you have read the draft and support adopting it, please say so.
If you see a problem with adopting it as a WG document, please tell us.
For both, remember that WG adoption does not mean that we already have =
consensus on all the details, just that this is the right working =
document to address the issue (and that we should address the issue in =
the first place).
Please do mention any issues that you already know; these also can be =
brought up in Wednesday=E2=80=99s virtual interim Webex call.

This formal WG adoption call runs until the end of September 17th.
(Given the state of the discussion, we might then have a Working Group =
last call of an updated document right next.)

Gr=C3=BC=C3=9Fe, Carsten

_______________________________________________
core mailing list
core@ietf.org
https://www.ietf.org/mailman/listinfo/core
_______________________________________________
Dots mailing list
Dots@ietf.org
https://www.ietf.org/mailman/listinfo/dots


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To: Carsten Bormann <cabo@tzi.org>, draft-ietf-core-sid@ietf.org, "draft-ietf-core-yang-cbor@ietf.org" <draft-ietf-core-yang-cbor@ietf.org>
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From: Robert Wilton <rwilton@cisco.com>
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Date: Tue, 11 Sep 2018 14:01:20 +0100
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Subject: [core] Status of draft-ietf-core-yang-cbor-06 and draft-ietf-core-sid-04
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Hi Carsten,

I was just wondering what the status was of draft-ietf-core-yang-cbor-06 
and draft-ietf-core-sid-04 please. I.e. how close are these documents to 
being ready for WG LC.

Kind regards,
Rob



From nobody Tue Sep 11 06:11:36 2018
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From: Christian =?iso-8859-1?Q?Ams=FCss?= <christian@amsuess.com>
To: draft-hartke-core-stateless@ietf.org
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Hello Klaus,

On Mon, Sep 10, 2018 at 04:07:48PM -0700, Jim Schaad wrote:
> Section 3.1 - I am not sure that I agree that the option should be unsafe=
 to
> forward.  As long as a client and a server agree to deal with the option
> then it does not matter what any intermediate proxies might do.  Changing
> this modifies 3.2.2 as well

I also think that the option can be safe to forward -- as long as the
origin server replies with the "option part" of the token, the proxy
will return the full original request identity (token plus option part)
back.

Either way, one could add that a proxy is free to take responsibility of
the Extended-Token itself, make a note to insert it into the response,
and forward the request without any Extended-Token, relieving the origin
server of the responsibility to deal with the critical option. (I figure
that any non-constrained proxy would want to do that, as it limits the
way a Extended-Token request can fail).

Best regards
Christian`

--=20
I shouldn't have written all those tank programs.
  -- Kevin Flynn

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From: "Jon Shallow" <supjps-ietf@jpshallow.com>
To: <core@ietf.org>, <dots@ietf.org>, <mohamed.boucadair@orange.com>
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Subject: Re: [core]  =?utf-8?q?=5BDots=5D___=F0=9F=94=94_WG_adoption_of_draft-?= =?utf-8?q?boucadair-core-hop-limit?=
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Likewise, I do not have any IPR related to this draft.

Regards

Jon

-----Original Message-----
From: Dots [mailto:ietf-supjps-dots-bounces@ietf.org] On Behalf Of =
ietf-supjps-mohamed.boucadair@orange.com
Sent: 11 September 2018 13:47
To: core@ietf.org
Cc: dots@ietf.org
Subject: Re: [Dots] [core] =F0=9F=94=94 WG adoption of =
draft-boucadair-core-hop-limit

Hi all,

I support this draft, obviously.=20

FWIW, I don't have any IPR related to this draft.=20

Cheers,
Med

> -----Message d'origine-----
> De : Dots [mailto:dots-bounces@ietf.org] De la part de Jon Shallow
> Envoy=C3=A9 : mardi 11 septembre 2018 13:03
> =C3=80 : core@ietf.org; 'Konda, Tirumaleswar Reddy'; dots@ietf.org
> Objet : Re: [Dots] FW: [core] =F0=9F=94=94 WG adoption of =
draft-boucadair-core-hop-limit
>=20
> Hi CoRE WG,
>=20
> I have read the draft and support it.
> I do not see any issues with it being a WG document.
>=20
> Regards
>=20
> Jon
>=20
> -----Original Message-----
> From: Dots [mailto: dots-bounces@ietf.org] On Behalf Of Konda, =
Tirumaleswar
> Reddy
> Sent: 11 September 2018 06:57
> To: dots@ietf.org
> Subject: [Dots] FW: [core] =F0=9F=94=94 WG adoption of =
draft-boucadair-core-hop-limit
>=20
> Hi all,
>=20
> Please review =
https://tools.ietf.org/html/draft-boucadair-core-hop-limit-00
> and respond to the WG adoption call in CoRE WG.
> DOTS signal channel is using the Hop-Limit Option defined in this =
draft.
>=20
> Cheers,
> -Tiru
>=20
> -----Original Message-----
> From: core <core-bounces@ietf.org> On Behalf Of Carsten Bormann
> Sent: Tuesday, September 11, 2018 1:25 AM
> To: Core <core@ietf.org>
> Subject: [core] =F0=9F=94=94 WG adoption of =
draft-boucadair-core-hop-limit
>=20
> This email originated from outside of the organization. Do not click =
links or
> open attachments unless you recognize the sender and know the content =
is
> safe.
>=20
> It seems we have converged at draft-boucadair-core-hop-limit as the =
draft
> providing the hop limit function needed by DOTS, but we =
haven=E2=80=99t done the
> formal WG adoption yet.
>=20
> This is a formal call for adoption of this draft as a WG document of =
the CoRE
> WG.
> If you have read the draft and support adopting it, please say so.
> If you see a problem with adopting it as a WG document, please tell =
us.
> For both, remember that WG adoption does not mean that we already have
> consensus on all the details, just that this is the right working =
document to
> address the issue (and that we should address the issue in the first =
place).
> Please do mention any issues that you already know; these also can be =
brought
> up in Wednesday=E2=80=99s virtual interim Webex call.
>=20
> This formal WG adoption call runs until the end of September 17th.
> (Given the state of the discussion, we might then have a Working Group =
last
> call of an updated document right next.)
>=20
> Gr=C3=BC=C3=9Fe, Carsten
>=20
> _______________________________________________
> core mailing list
> core@ietf.org
> https://www.ietf.org/mailman/listinfo/core
> _______________________________________________
> Dots mailing list
> Dots@ietf.org
> https://www.ietf.org/mailman/listinfo/dots
>=20
> _______________________________________________
> Dots mailing list
> Dots@ietf.org
> https://www.ietf.org/mailman/listinfo/dots
_______________________________________________
Dots mailing list
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From nobody Tue Sep 11 06:40:55 2018
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From: Christian =?iso-8859-1?Q?Ams=FCss?= <christian@amsuess.com>
To: Klaus Hartke <klaus.hartke@ericsson.com>
Cc: "draft-hartke-core-stateless@ietf.org" <draft-hartke-core-stateless@ietf.org>, 'Core' <core@ietf.org>
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Subject: Re: [core] draft-hartke-core-stateless
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Hello Klaus,

On Tue, Sep 11, 2018 at 01:31:14PM +0000, Klaus Hartke wrote:
> But proxies also generate responses themselves, e.g., from cached
> responses or in case of errors (5.02, 5.04). We don't want clients to
> receive the extended token from another client or no extended token at
> all when a proxy does not support the option.

As long as the option is part of the cache key, any cached response
would need to have a matching request Extended-Token and thus would have
a matching response Extended-Token as well.

If those, by any chance, match up between two different staetless
proxies, *and* if there is a cached fresh response available, then so be
it, may the new request receive the original response. After all, it is
fresh, and the response Extended-Token returned is exactly the one
requested. If both requesting stateless proxies were stateful ones,
neither request would have a Extended-Token option, and the second
client would receive the cached request just as well.

(This is about the astronomically unlikely case of a collision in the
integrity protected tokens; it's way more likely that the stateless
proxy re-requested the resource on behalf of the very same origin if
such a cache hit happens. But still, even if, it'd be OK).

Best regards
Christian

--=20
To use raw power is to make yourself infinitely vulnerable to greater power=
s.
  -- Bene Gesserit axiom

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From: Jim Schaad <ietf@augustcellars.com>
To: 'Klaus Hartke' <klaus.hartke@ericsson.com>, =?utf-8?Q?'Christian_Ams=C3=BCss'?= <christian@amsuess.com>, <draft-hartke-core-stateless@ietf.org>
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Subject: Re: [core] draft-hartke-core-stateless
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> -----Original Message-----
> From: Klaus Hartke <klaus.hartke@ericsson.com>
> Sent: Tuesday, September 11, 2018 6:31 AM
> To: Christian Ams=C3=BCss <christian@amsuess.com>; draft-hartke-core-
> stateless@ietf.org
> Cc: Jim Schaad <ietf@augustcellars.com>; 'Core' <core@ietf.org>
> Subject: RE: [core] draft-hartke-core-stateless
>=20
> Christian Ams=C3=BCss wrote:
> > I also think that the option can be safe to forward -- as long as =
the
> > origin server replies with the "option part" of the token, the proxy
> > will return the full original request identity (token plus option =
part) back.
>=20
> Right, proxies could simply forward the extended tokens in the =
requests and
> responses generated by clients and servers. But proxies also generate
> responses themselves, e.g., from cached responses or in case of errors =
(5.02,
> 5.04). We don't want clients to receive the extended token from =
another client
> or no extended token at all when a proxy does not support the option.
>=20
> I can't think of any way to get sensible behavior without the proxies
> understanding what's going on.

If the option is part of the cache key for proxies which do not =
understand the option then you will not have that problem.

Jim

>=20
> Klaus



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From: Michel Veillette <Michel.Veillette@trilliant.com>
To: "yot@ietf.org" <yot@ietf.org>
CC: Core <core@ietf.org>
Thread-Topic: Next version of draft-ietf-core-yang-cbor available for review on github
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Archived-At: <https://mailarchive.ietf.org/arch/msg/core/XqArqTgiXSGTmqiBj1JCgzn_8a0>
Subject: [core] Next version of draft-ietf-core-yang-cbor available for review on github
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The updated version of https://datatracker.ietf.org/doc/draft-ietf-core-yan=
g-cbor/ is available
at http://core-wg.github.io/yang-cbor/draft-ietf-core-yang-cbor-latest.txt.

To generate a diff of the proposed changes, enter:
https://tools.ietf.org//rfcdiff?url1=3Dhttps://www.ietf.org/archive/id/draf=
t-ietf-core-yang-cbor-06.txt&url2=3Dhttp://core-wg.github.io/yang-cbor/draf=
t-ietf-core-yang-cbor-latest.txt<https://tools.ietf.org/rfcdiff?url1=3Dhttp=
s://www.ietf.org/archive/id/draft-ietf-core-yang-cbor-06.txt&url2=3Dhttp://=
core-wg.github.io/yang-cbor/draft-ietf-core-yang-cbor-latest.txt>

Comments or updates to this draft can be email to me until Friday.

Good review,
Michel Veillette



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-CA">The updated version of <a href=
=3D"https://datatracker.ietf.org/doc/draft-ietf-core-yang-cbor/">
https://datatracker.ietf.org/doc/draft-ietf-core-yang-cbor/</a> is availabl=
e<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">at <a href=3D"http://core-wg.gi=
thub.io/yang-cbor/draft-ietf-core-yang-cbor-latest.txt">
http://core-wg.github.io/yang-cbor/draft-ietf-core-yang-cbor-latest.txt</a>=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">To generate a diff of the propo=
sed changes, enter:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><a href=3D"https://tools.ietf.o=
rg/rfcdiff?url1=3Dhttps://www.ietf.org/archive/id/draft-ietf-core-yang-cbor=
-06.txt&amp;url2=3Dhttp://core-wg.github.io/yang-cbor/draft-ietf-core-yang-=
cbor-latest.txt">https://tools.ietf.org//rfcdiff?url1=3Dhttps://www.ietf.or=
g/archive/id/draft-ietf-core-yang-cbor-06.txt&amp;url2=3Dhttp://core-wg.git=
hub.io/yang-cbor/draft-ietf-core-yang-cbor-latest.txt</a><o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Comments or updates to this dra=
ft can be email to me until Friday.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Good review,<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Michel Veillette<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA"><o:p>&nbsp;</o:p></span></p>
</div>
</body>
</html>

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   tl;dr> ****  HOW SHOULD SID VALUES BE DOCUMENTED IN RFCs?  ****

BACKGROUND:

The ANIMA WG is using https://tools.ietf.org/html/draft-ietf-core-yang-cbor-06
(expired in August, I hope it will be updated soon) and
https://tools.ietf.org/html/draft-ietf-core-sid-04 to encode RFC8366
defined vouchers in CBOR.  They are then signed with CMS or COSE.

We have been using the sid.py pyang extension created by Michel Veillette
to allocate the sid from the YANG definitions.  We have two questions.

QUESTIONS:
1) as one can see at:
   https://tools.ietf.org/html/draft-ietf-anima-constrained-voucher-02#section-6.1.2

After the traditional dump of the yang tree view, we are showing the
resulting assignments in a table in the ID (slightly edited from above):

      SID Assigned to
   --------- --------------------------------------------------
     1001150 module ietf-constrained-voucher-request
     1001154 data .../voucher
     1001155 data .../assertion
     1001156 data .../created-on
     1001157 data .../domain-cert-revocation-checks
     1001158 data .../expires-on
     1001159 data .../idevid-issuer
     1001160 data .../last-renewal-date
     1001161 data .../nonce
     1001162 data .../pinned-domain-cert
     1001163 data .../prior-signed-voucher-request
     1001164 data .../proximity-registrar-cert
     1001165 data .../proximity-registrar-subject-public-key-info
     1001166 data .../serial-number

the 1001150:50 space of SIDs was assigned by comi.space.  This display was
produced originally by minor editing of the result of the --list-sids option
to the sid.py plugin.    The allocation does not start at 1001150 because
some IDs are used to number the YANG modules that were included.

We are among the first users of the sid.py plugin, and the (re-)numbering of
all of the include modules in this way is likely a mistake, which has not
been solved.  Before I solve the underlying problems and fix the output to
produce what I think I want, we felt it was important to ask the WG...

****
        HOW SHOULD SID VALUES BE DOCUMENTED IN RFCs?
****

I'm not enthusiastic about including the .sid files only, but it could be
done, and we could say that they are normative, while --list-sid style above
is not.

SHOULD ietf-core-sid say something about this?


2) Given that https://tools.ietf.org/html/draft-ietf-core-sid-04#section-6.1
   allocates the first 1,000,000 to IANA,   then comi.space has
   started to give out entries > 1,000,000 it seems that comi.space ought
   to get the 1,000,000 -> 1,999,999 "mega-range" assigned to it.

   The question is, what should a document that has allocated a range from
   comi.space do it's in IANA Considerations?

   If ietf-core-sid could be advanced sooner, and IANA could create the
   registry,  we could ask for an early allocation value in the 100,000 ->
   999,999 range from IANA.

   Alternatively, ietf-core-sid-04 could allocate a range to our document
   in the section 6.1.2  "RFC SID range assignment" sub-registry.


3) It appears that there might be a typo in ietf-core-sid-04, section 6.1.1:


  o  The range of 100,000 to 999,999 is reserved for standardized YANG
      modules.  The IANA policy for future additions to this sub-
      registry is "Specification Required" [RFC5226].  Allocation within
      this range requires publishing of the associated ".yang" and
      ".sid" files in the YANG module registry.

   +-------------+---------------+------------------------+
   | Entry Point | Size          | IANA policy            |
   +-------------+---------------+------------------------+
   | 0           | 1,000         | IETF review            |
   | 1,000       | 59,000        | RFC required           |
   | 60,000      | 40,000        | Experimental use       |
   | 100,000     | 1,000,000,000 | Specification Required |
   +-------------+---------------+------------------------+
                   ^^^^^^^^^^^^^-- seem to be too many zeros



--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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On Sep 11, 2018, at 22:25, Michael Richardson <mcr+ietf@sandelman.ca> =
wrote:
>=20
> SHOULD ietf-core-sid say something about this?

Yes, we should have a common way of handling SID allocations in RFCs.

draft-ietf-core-sid sounds like a natural way to place this, but what =
goes into what document is often a question of who has time to write =
something at a particular point in time.  So let=E2=80=99s discuss this =
with the authors.

In any case, this probably should stay at the level of a suggestion more =
than prescribing a normative way of doing things =E2=80=94 the =
conventions we use for this may evolve faster than the rest of the =
technical content of draft-ietf-core-sid.

Gr=C3=BC=C3=9Fe, Carsten


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Carsten Bormann <cabo@tzi.org> wrote:
    >> SHOULD ietf-core-sid say something about this?

    > Yes, we should have a common way of handling SID allocations in RFCs.

It's not just allocations, but presentation.

    > draft-ietf-core-sid sounds like a natural way to place this, but what
    > goes into what document is often a question of who has time to write
    > something at a particular point in time.  So let=E2=80=99s discuss th=
is with
    > the authors.

agreed.

    > In any case, this probably should stay at the level of a suggestion
    > more than prescribing a normative way of doing things =E2=80=94 the c=
onventions
    > we use for this may evolve faster than the rest of the technical
    > content of draft-ietf-core-sid.

I don't want a prescription either, but rather a BCP that evolves.

=2D-
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -=3D IPv6 IoT consulting =3D-




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On Tue, Sep 11, 2018 at 3:12 PM, Carsten Bormann <cabo@tzi.org> wrote:

> On Sep 11, 2018, at 22:25, Michael Richardson <mcr+ietf@sandelman.ca>
> wrote:
> >
> > SHOULD ietf-core-sid say something about this?
>
> Yes, we should have a common way of handling SID allocations in RFCs.
>
> draft-ietf-core-sid sounds like a natural way to place this, but what goe=
s
> into what document is often a question of who has time to write something
> at a particular point in time.  So let=E2=80=99s discuss this with the au=
thors.
>
> In any case, this probably should stay at the level of a suggestion more
> than prescribing a normative way of doing things =E2=80=94 the convention=
s we use
> for this may evolve faster than the rest of the technical content of
> draft-ietf-core-sid.
>
>
You probably want to make a clear distinction between Internet Drafts with
volatile SID assignments
and RFCs with permanent SID assignments.

Do you want early implementation (of modules using SID)  to be as painful
as possible or as seamless as possible?
Renumbering SID assignments may be extremely disruptive to actual
deployments.
Correctness of a SID file within a source document is not the same thing as
correctness of all SID files
across an entire administrative domain.

I agree the administration of SID assignments is out of scope for CORE WG
but punting
the problem to vendors or operators will not be good enough.



Gr=C3=BC=C3=9Fe, Carsten
>


Andy


>
> _______________________________________________
> core mailing list
> core@ietf.org
> https://www.ietf.org/mailman/listinfo/core
>

--000000000000c3810d0575a0e3c4
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Tue, Sep 11, 2018 at 3:12 PM, Carsten Bormann <span dir=3D"ltr">&lt;=
<a href=3D"mailto:cabo@tzi.org" target=3D"_blank">cabo@tzi.org</a>&gt;</spa=
n> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex">On Sep 11, 2018, at 22:25, Mich=
ael Richardson &lt;<a href=3D"mailto:mcr%2Bietf@sandelman.ca">mcr+ietf@sand=
elman.ca</a>&gt; wrote:<br>
&gt; <br>
&gt; SHOULD ietf-core-sid say something about this?<br>
<br>
Yes, we should have a common way of handling SID allocations in RFCs.<br>
<br>
draft-ietf-core-sid sounds like a natural way to place this, but what goes =
into what document is often a question of who has time to write something a=
t a particular point in time.=C2=A0 So let=E2=80=99s discuss this with the =
authors.<br>
<br>
In any case, this probably should stay at the level of a suggestion more th=
an prescribing a normative way of doing things =E2=80=94 the conventions we=
 use for this may evolve faster than the rest of the technical content of d=
raft-ietf-core-sid.<br>
<br></blockquote><div><br></div><div>You probably want to make a clear dist=
inction between Internet Drafts with volatile SID assignments</div><div>and=
 RFCs with permanent SID assignments.</div><div><br></div><div>Do you want =
early implementation (of modules using SID) =C2=A0to be as painful as possi=
ble or as seamless as possible?</div><div>Renumbering SID assignments may b=
e extremely disruptive to actual deployments.</div><div>Correctness of a SI=
D file within a source document is not the same thing as correctness of all=
 SID files</div><div>across an entire administrative domain.</div><div><br>=
</div><div>I agree the administration of SID assignments is out of scope fo=
r CORE WG but punting</div><div>the problem to vendors or operators will no=
t be good enough.</div><div><br></div><div><br></div><div><br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex">
Gr=C3=BC=C3=9Fe, Carsten<br></blockquote><div><br></div><div><br></div><div=
>Andy</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
______________________________<wbr>_________________<br>
core mailing list<br>
<a href=3D"mailto:core@ietf.org">core@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/core" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/core</a><br>
</blockquote></div><br></div></div>

--000000000000c3810d0575a0e3c4--


From nobody Wed Sep 12 01:19:18 2018
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From: <mohamed.boucadair@orange.com>
To: Jim Schaad <ietf@augustcellars.com>, "draft-boucadair-core-hop-limit@ietf.org" <draft-boucadair-core-hop-limit@ietf.org>
CC: 'core' <core@ietf.org>, "dots@ietf.org" <dots@ietf.org>
Thread-Topic: Review Comments on draft-boucadair-core-hop-limit 
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Subject: Re: [core] Review Comments on draft-boucadair-core-hop-limit
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Hi Jim, all,=20

Thank you for sharing the comments.

Please see inline.=20

Cheers,
Med

> -----Message d'origine-----
> De=A0: Jim Schaad [mailto:ietf@augustcellars.com]
> Envoy=E9=A0: jeudi 23 ao=FBt 2018 06:19
> =C0=A0: draft-boucadair-core-hop-limit@ietf.org
> Cc=A0: 'core'
> Objet=A0: Review Comments on draft-boucadair-core-hop-limit
>=20
> Section 3 - para 2 - It would be clearer to me to say that the Hop-Limit
> value is between 0 and 255 inclusive rather than talk about the length of
> the option because I don't know if that includes all of the option encodi=
ng
> bytes or not.
>=20

[Med] Done in my local copy.=20

> Section 3 - para 4 - Probably does not matter, but the current algorithm
> wastes one bit.  Check for 0 and then decrement would give one addition
> possible field.  It would also compress down the size of the encoded opti=
on
> faster.
>=20
> Section 3 - I don't know that you only want to have a proxy information
> appearing once.  If it appears multiple times then you can easily spot th=
e
> loop.  No real option one way or the other.
>=20

[Med] We had that restrictions for two reasons:
- ease correlation between hop count and the information recorded in the bo=
dy.
- maintain a reasonable message size.=20

> Section 3 - Last paragraph - I presume that a border proxy could remove
> rather than re-write the option as well.  This would be esp. true if for
> example it was changing transports.
>=20

[Med] Yes, fixed in my local copy.=20

> Section 4.2 - Someplace there needs to be a discussion on why the values =
of
> C, U and N
>=20
> I would have expected the values to be
> - Critical - no

[Med] Agree.=20

> - Unsafe - no - a proxy which does not understand the option should still
> forward it on.  At worst you will get the same behavior as if the option =
was
> not included.

[Med] We set it to "Unsafe - yes" for the DOTS case because the proxies are=
 under the control of the same entity and we wanted to have something relia=
ble. I do agree that for the general CoAP case, we can relax that to "Unsaf=
e - no"

> - NoCacheKey - yes - If you get two gets for the same resource with
> different hop counts the proxy should still be able to return the current=
ly
> cached value.
>=20

[Med] Will add some text to explain the rationale for setting the C/U/N val=
ues. Thanks.=20

> Section 5 - There is a potential privacy consideration that may need to b=
e
> covered.  The return value is going to provide an eavesdropper a large
> amount of information on the configuration of the network.  Is there valu=
e
> to configuring so that the error but not the trace stack is provided?
>=20
>=20

[Med] Good point. There is still a value in returning the error even withou=
t the trace as this allows a peer to know why a request failed. Proxies at =
boundaries are supposed to generate alarms to administrators.

We can consider adding the following:=20
- a proxy which is located at the boundary of an administrative domain may =
be instructed to strip the diagnostic payload or part of it before forwardi=
ng 5.06 upstream.  =20


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From: Klaus Hartke <klaus.hartke@ericsson.com>
To: 'Core' <core@ietf.org>
Thread-Topic: [core] draft-hartke-core-stateless
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I=E2=80=99m starting to understand this Webex thing.

Here are the Webex details for the meeting today (which starts in a bit =
less than half an hour).

Agenda so far:

=E2=80=94 Content-Format 62 (multipart-core) is allocated
=E2=80=94 finishing touches for draft-boucadair-core-hop-limit (In =
working group adoption call); any other continuation of the previous =
interim
    =E2=80=94 minutes from previous interim:  =
https://datatracker.ietf.org/meeting/interim-2018-core-02/materials/minute=
s-interim-2018-core-02-201808291500 =
<https://datatracker.ietf.org/meeting/interim-2018-core-02/materials/minut=
es-interim-2018-core-02-201808291500>
=E2=80=94 way forward with stateless proxies as needed for 6tisch, =
specifically draft-hartke-core-stateless: Approach A or B (or something =
unknown yet?)

Gr=C3=BC=C3=9Fe, Carsten


>=20
> Virtual Interim
> Wednesday, September 12, 2018
> 3:00 pm  |  Greenwich Time (Reykjavik, GMT)  |  1 hr
> Meeting number (access code): 317 115 178
> Meeting password: constrained
>=20
>=20
> =20
> Add to Calendar =
<https://ietf.webex.com/ietf/j.php?MTID=3Dmdac039703be597b24cf19d2a6f60248=
9>=09
> When it's time, join the meeting =
<https://ietf.webex.com/ietf/j.php?MTID=3Dm4a9735d0db3ce49f3f697a2679b5781=
7>.
> =20
> Join by phone
> 1-650-479-3208 Call-in toll number (US/Canada)
> =20
> Can't join the meeting? =
<https://collaborationhelp.cisco.com/article/WBX000029055>
> =20
> IMPORTANT NOTICE: Please note that this Webex service allows audio and =
other information sent during the session to be recorded, which may be =
discoverable in a legal matter. By joining this session, you =
automatically consent to such recordings. If you do not consent to being =
recorded, discuss your concerns with the host or do not join the =
session.


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">I=E2=80=
=99m starting to understand this Webex thing.<div class=3D""><br =
class=3D""></div><div class=3D"">Here are the Webex details for the =
meeting today (which starts in a bit less than half an hour).</div><div =
class=3D""><br class=3D""></div><div class=3D"">Agenda so far:</div><div =
class=3D""><br class=3D""></div><div class=3D"">=E2=80=94 Content-Format =
62 (multipart-core) is allocated</div><div class=3D"">=E2=80=94 =
finishing touches for draft-boucadair-core-hop-limit (In working group =
adoption call); any other continuation of&nbsp;the previous =
interim</div><div class=3D"">&nbsp; &nbsp; =E2=80=94 minutes from =
previous interim: &nbsp;<a =
href=3D"https://datatracker.ietf.org/meeting/interim-2018-core-02/material=
s/minutes-interim-2018-core-02-201808291500" =
class=3D"">https://datatracker.ietf.org/meeting/interim-2018-core-02/mater=
ials/minutes-interim-2018-core-02-201808291500</a><br class=3D"">=E2=80=94=
 way forward with stateless proxies as needed for 6tisch, specifically =
draft-hartke-core-stateless: Approach A or B (or something =
unknown&nbsp;yet?)<br class=3D""></div><div class=3D""><br =
class=3D""></div><div class=3D""><div class=3D"">Gr=C3=BC=C3=9Fe, =
Carsten</div></div><div class=3D""><br class=3D""></div><div =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><table width=3D"100%" align=3D"left" style=3D"border-collapse: =
separate; border: 0px white; border-spacing: 0px; width: 1403px; =
max-width: 100%; min-width: 279px !important; caret-color: rgb(0, 0, 0); =
font-family: Helvetica; letter-spacing: normal; orphans: auto; =
text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; =
text-decoration: none; padding: 0px; margin: 0px;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 20px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 5px 0px 0px;" =
class=3D""><table align=3D"left" style=3D"border-collapse: separate; =
border: 0px white; border-spacing: 0px; width: 525px; max-width: 100%; =
min-width: 279px !important; margin-left: 5px;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 20px;" class=3D""><td valign=3D"top" =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px;" =
class=3D""><table width=3D"100%" style=3D"border-collapse: separate; =
border: 0px white; border-spacing: 0px; width: 1403px; max-width: 100%; =
min-width: 279px !important;" class=3D""><tbody class=3D""><tr =
style=3D"line-height: 20px;" class=3D""><td style=3D"word-wrap: =
break-word; word-break: normal; font-size: 16px; font-family: Arial; =
color: rgb(77, 77, 77); padding: 0px;" class=3D""><b class=3D"">Virtual =
Interim</b></td></tr><tr style=3D"line-height: 20px; margin: 0px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); padding: =
0px;" class=3D"">Wednesday, September 12, 2018</td></tr><tr =
style=3D"line-height: 20px; margin: 0px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px;" =
class=3D"">3:00 pm&nbsp;&nbsp;|&nbsp;&nbsp;Greenwich Time (Reykjavik, =
GMT)&nbsp;&nbsp;|&nbsp;&nbsp;1 hr</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: auto !important; max-width: 100%; min-width: 279px =
!important;" class=3D""><tbody class=3D""><tr style=3D"line-height: =
20px;" class=3D""><td style=3D"word-wrap: break-word; word-break: =
normal; font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); =
padding: 0px;" class=3D"">Meeting number (access code): 317 115 =
178</td></tr></tbody></table><table style=3D"border-collapse: separate; =
border: 0px white; border-spacing: 0px; width: auto !important; =
max-width: 100%; min-width: 279px !important;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 20px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px;" =
class=3D"">Meeting password: constrained</td></tr></tbody></table><br =
class=3D""><font size=3D"2" color=3D"#FF0000" class=3D""></font><br =
class=3D""><table style=3D"border-collapse: separate; border: 0px white; =
border-spacing: 0px; width: 1403px; max-width: 100%; min-width: 279px =
!important;" class=3D""><tbody class=3D""><tr style=3D"line-height: =
20px;" class=3D""><td style=3D"word-wrap: break-word; word-break: =
normal; font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); =
padding: 0px; height: 20px;" =
class=3D"">&nbsp;</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: auto !important; max-width: 100%; min-width: 279px =
!important;" class=3D""><tbody class=3D""><tr style=3D"line-height: =
20px;" class=3D""><td style=3D"word-wrap: break-word; word-break: =
normal; font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); =
padding: 0px; width: auto !important;" class=3D""><table border=3D"0" =
cellpadding=3D"0" cellspacing=3D"0" style=3D"border-collapse: separate; =
border: 2px solid rgb(4, 140, 191); border-spacing: 0px; width: auto =
!important; max-width: 100%; min-width: 186px !important; =
background-color: rgb(4, 140, 191);" class=3D""><tbody class=3D""><tr =
style=3D"line-height: 20px;" class=3D""><td align=3D"center" =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 14px 20px;" =
class=3D""><a =
href=3D"https://ietf.webex.com/ietf/j.php?MTID=3Dmdac039703be597b24cf19d2a=
6f602489" style=3D"font-size: 20px; font-family: Arial; color: rgb(255, =
255, 255); padding: 0px; text-decoration: none;" class=3D"">Add to =
Calendar</a></td></tr></tbody></table></td><td style=3D"word-wrap: =
break-word; word-break: normal; font-size: 15px; font-family: Arial; =
color: rgb(102, 102, 102); padding: 0px; width: auto !important;" =
class=3D""><table border=3D"0" cellpadding=3D"0" cellspacing=3D"0" =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: auto !important; max-width: 100%; min-width: 186px =
!important;" class=3D""><tbody class=3D""><tr style=3D"line-height: =
20px;" class=3D""><td style=3D"word-wrap: break-word; word-break: =
normal; font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); =
padding: 0px 0px 0px 16px;" class=3D"">When it's time,<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://ietf.webex.com/ietf/j.php?MTID=3Dm4a9735d0db3ce49f3f697a26=
79b57817" style=3D"font-size: 15px; font-family: Arial; color: rgb(0, =
175, 249); padding: 0px; text-decoration: none;" class=3D"">join the =
meeting</a>.</td></tr></tbody></table></td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1403px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); padding: =
0px; height: 20px;" class=3D"">&nbsp;</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1403px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 16px; font-family: Arial; color: rgb(102, 102, 102); padding: =
0px;" class=3D""><b class=3D"">Join by phone</b></td></tr><tr =
style=3D"line-height: 20px; margin: 0px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px;" =
class=3D""><b class=3D"">1-650-479-3208</b>&nbsp;Call-in toll number =
(US/Canada)</td></tr></tbody></table><table style=3D"border-collapse: =
separate; border: 0px white; border-spacing: 0px; width: 1403px; =
max-width: 100%; min-width: 279px !important;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 20px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px; height: =
20px;" class=3D"">&nbsp;</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1403px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 13px; font-family: Arial; color: rgb(102, 102, 102); padding: =
0px;" class=3D""><a =
href=3D"https://collaborationhelp.cisco.com/article/WBX000029055" =
style=3D"font-size: 13px; font-family: Arial; color: rgb(0, 175, 249); =
padding: 0px; text-decoration: none;" class=3D"">Can't join the =
meeting?</a></td></tr></tbody></table><table style=3D"border-collapse: =
separate; border: 0px white; border-spacing: 0px; width: 1403px; =
max-width: 100%; min-width: 279px !important;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 10px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px; height: =
10px;" class=3D"">&nbsp;</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1403px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 12px; font-family: Arial; color: rgb(160, 160, 160); padding: =
0px;" class=3D"">IMPORTANT NOTICE: Please note that this Webex service =
allows audio and other information sent during the session to be =
recorded, which may be discoverable in a legal matter. By joining this =
session, you automatically consent to such recordings. If you do not =
consent to being recorded, discuss your concerns with the host or do not =
join the =
session.</td></tr></tbody></table></td></tr></tbody></table></td></tr></tb=
ody></table></div></blockquote></div></div></body></html>=

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(US/Canada)\n\n\n\nCan't=20join=20the=20=
meeting?\nhttps://collaborationhelp.cisco.com/article/WBX000029055\n\n\nIM=
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178</FONT>=09=09=09=09=09</td>=09=09=09=09</tr>=09=09=09</table>=09=09=09=
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=09</FONT><br><FONT=20size=3D"2"=20COLOR=3D"#FF0000"></FONT><br><FONT=20=
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number=20(US/Canada)</FONT>&nbsp;=20<BR></FONT><BR><BR>=09&nbsp;<BR>=09=
<a=20href=3D"https://collaborationhelp.cisco.com/article/WBX000029055">=09=
<FONT=20SIZE=3D"1"=20COLOR=3D"#00AFF9"=20FACE=3D"Arial">Can't=20join=20=
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><div><blockquote type="cite" class=""><div class=""></div></blockquote></div><br class=""></div></body></html>
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--Apple-Mail=_7212FE3A-9AD7-4C0F-AFC5-2A1114D13A02--


From nobody Wed Sep 12 07:52:55 2018
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To: <mohamed.boucadair@orange.com>, <draft-boucadair-core-hop-limit@ietf.org>
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Subject: Re: [core] Review Comments on draft-boucadair-core-hop-limit
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> -----Original Message-----
> From: mohamed.boucadair@orange.com <mohamed.boucadair@orange.com>
> Sent: Wednesday, September 12, 2018 1:19 AM
> To: Jim Schaad <ietf@augustcellars.com>; draft-boucadair-core-hop-
> limit@ietf.org
> Cc: 'core' <core@ietf.org>; dots@ietf.org
> Subject: RE: Review Comments on draft-boucadair-core-hop-limit
>=20
> Hi Jim, all,
>=20
> Thank you for sharing the comments.
>=20
> Please see inline.
>=20
> Cheers,
> Med
>=20
> > -----Message d'origine-----
> > De=A0: Jim Schaad [mailto:ietf@augustcellars.com] Envoy=E9=A0: jeudi =
23 ao=FBt
> > 2018 06:19 =C0=A0: draft-boucadair-core-hop-limit@ietf.org
> > Cc=A0: 'core'
> > Objet=A0: Review Comments on draft-boucadair-core-hop-limit
> >
>=20
> > Section 3 - para 4 - Probably does not matter, but the current
> > algorithm wastes one bit.  Check for 0 and then decrement would give
> > one addition possible field.  It would also compress down the size =
of
> > the encoded option faster.

Did you miss this?

> >
> > Section 3 - I don't know that you only want to have a proxy
> > information appearing once.  If it appears multiple times then you =
can
> > easily spot the loop.  No real option one way or the other.
> >
>=20
> [Med] We had that restrictions for two reasons:
> - ease correlation between hop count and the information recorded in =
the
> body.
> - maintain a reasonable message size.

Looks like I was half asleep - should have been no real opinion either =
way.
This is fine.  You may want to comment on that but I don't really care.

> > Section 5 - There is a potential privacy consideration that may need
> > to be covered.  The return value is going to provide an eavesdropper =
a
> > large amount of information on the configuration of the network.  Is
> > there value to configuring so that the error but not the trace stack =
is
> provided?
> >
> >
>=20
> [Med] Good point. There is still a value in returning the error even
without the
> trace as this allows a peer to know why a request failed. Proxies at
boundaries
> are supposed to generate alarms to administrators.
>=20
> We can consider adding the following:
> - a proxy which is located at the boundary of an administrative domain =
may
be
> instructed to strip the diagnostic payload or part of it before =
forwarding
5.06
> upstream.

That would be fine.

Jim




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To: 'Klaus Hartke' <klaus.hartke@ericsson.com>, 'Core' <core@ietf.org>
References: <009901d4495b$194c4f30$4be4ed90$@augustcellars.com> <20180911131124.GA5521@hephaistos.amsuess.com> <6131e11057e84ec3882d487b32965856@ericsson.com> <20180911134046.GB5521@hephaistos.amsuess.com> <cc47ffed0e7442a98d69b9a4702d8efc@ericsson.com>
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Subject: Re: [core] draft-hartke-core-stateless
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> -----Original Message-----
> From: core <core-bounces@ietf.org> On Behalf Of Klaus Hartke
> Sent: Wednesday, September 12, 2018 1:35 AM
> To: 'Core' <core@ietf.org>
> Subject: Re: [core] draft-hartke-core-stateless
>=20
> Christian Ams=C3=BCss wrote:
> > > But proxies also generate responses themselves, e.g., from cached
> > > responses or in case of errors (5.02, 5.04). We don't want clients
> > > to receive the extended token from another client or no extended
> > > token at all when a proxy does not support the option.
> >
> > As long as the option is part of the cache key, any cached response
> > would need to have a matching request Extended-Token and thus would
> > have a matching response Extended-Token as well.
>=20
> I don't think it's very desirable to require tokens to match when =
serving a
> cached response.
>=20
> And there's still the other half of the problem: An unaware proxy =
won't include
> the option in responses it generates itself.

Reiterate -

For an unaware proxy having the item as part of the cached key prevents =
it from generating responses itself.

Text which says that aware proxies can omit the option from the cached =
key allows them to generate responses out of the cache and they will =
know that they need to process and return the option.

Jim

>=20
> Klaus
>=20
> _______________________________________________
> core mailing list
> core@ietf.org
> https://www.ietf.org/mailman/listinfo/core


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From: Klaus Hartke <klaus.hartke@ericsson.com>
To: Jim Schaad <ietf@augustcellars.com>, 'Core' <core@ietf.org>
Thread-Topic: [core] draft-hartke-core-stateless
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Re-,

Please see inline.=20

Cheers,
Med

> -----Message d'origine-----
> De=A0: Jim Schaad [mailto:ietf@augustcellars.com]
> Envoy=E9=A0: mercredi 12 septembre 2018 16:52
> =C0=A0: BOUCADAIR Mohamed IMT/OLN; draft-boucadair-core-hop-limit@ietf.or=
g
> Cc=A0: 'core'; dots@ietf.org
> Objet=A0: RE: Review Comments on draft-boucadair-core-hop-limit
>=20
>=20
>=20
> > -----Original Message-----
> > From: mohamed.boucadair@orange.com <mohamed.boucadair@orange.com>
> > Sent: Wednesday, September 12, 2018 1:19 AM
> > To: Jim Schaad <ietf@augustcellars.com>; draft-boucadair-core-hop-
> > limit@ietf.org
> > Cc: 'core' <core@ietf.org>; dots@ietf.org
> > Subject: RE: Review Comments on draft-boucadair-core-hop-limit
> >
> > Hi Jim, all,
> >
> > Thank you for sharing the comments.
> >
> > Please see inline.
> >
> > Cheers,
> > Med
> >
> > > -----Message d'origine-----
> > > De=A0: Jim Schaad [mailto:ietf@augustcellars.com] Envoy=E9=A0: jeudi =
23 ao=FBt
> > > 2018 06:19 =C0=A0: draft-boucadair-core-hop-limit@ietf.org
> > > Cc=A0: 'core'
> > > Objet=A0: Review Comments on draft-boucadair-core-hop-limit
> > >
> >
> > > Section 3 - para 4 - Probably does not matter, but the current
> > > algorithm wastes one bit.  Check for 0 and then decrement would give
> > > one addition possible field.  It would also compress down the size of
> > > the encoded option faster.
>=20
> Did you miss this?

[Med] Actually, no. I discussed with my co-authors. Tiru proposed this chan=
ge:=20

"CoAP messages MUST NOT be forwarded if the Hop-Limit option is set to '0' =
before decrement."=20

But I'm not sure this is superior to what we had already in the draft which=
 allows to detect the loop earlier in the forwarding path.=20

Please let us know if we missed your point.=20

>=20
> > >
> > > Section 3 - I don't know that you only want to have a proxy
> > > information appearing once.  If it appears multiple times then you ca=
n
> > > easily spot the loop.  No real option one way or the other.
> > >
> >
> > [Med] We had that restrictions for two reasons:
> > - ease correlation between hop count and the information recorded in th=
e
> > body.
> > - maintain a reasonable message size.
>=20
> Looks like I was half asleep - should have been no real opinion either wa=
y.
> This is fine.  You may want to comment on that but I don't really care.
>=20
> > > Section 5 - There is a potential privacy consideration that may need
> > > to be covered.  The return value is going to provide an eavesdropper =
a
> > > large amount of information on the configuration of the network.  Is
> > > there value to configuring so that the error but not the trace stack =
is
> > provided?
> > >
> > >
> >
> > [Med] Good point. There is still a value in returning the error even
> without the
> > trace as this allows a peer to know why a request failed. Proxies at
> boundaries
> > are supposed to generate alarms to administrators.
> >
> > We can consider adding the following:
> > - a proxy which is located at the boundary of an administrative domain =
may
> be
> > instructed to strip the diagnostic payload or part of it before forward=
ing
> 5.06
> > upstream.
>=20
> That would be fine.

[Med] OK, thanks.

>=20
> Jim
>=20
>=20


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Date: Wed, 12 Sep 2018 17:15:25 +0200
From: Peter van der Stok <stokcons@bbhmail.nl>
To: Andy Bierman <andy@yumaworks.com>
Cc: Carsten Bormann <cabo@tzi.org>, anima@ietf.org, Core <core@ietf.org>
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Subject: Re: [core] [Anima]   documenting SID usage in IETF specification
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--=_9802736c5b204041a9a69ea98371528f
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Hi all,

The numbering of the SIDs in our case should be as stable as possible
after publication as RFC.
A permanent assignment of the numbers, like the content-format numbers,
would be very much appreciated.
Using the same already allocated numbers for other RFCs would be quite
disastrous.

Maintenance of (part of) the comi.space by a organisation like IANA
could be a possibility.

Peter
Andy Bierman schreef op 2018-09-12 01:32:

> On Tue, Sep 11, 2018 at 3:12 PM, Carsten Bormann <cabo@tzi.org> wrote:
> 
>> On Sep 11, 2018, at 22:25, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
>>> 
>>> SHOULD ietf-core-sid say something about this?
>> 
>> Yes, we should have a common way of handling SID allocations in RFCs.
>> 
>> draft-ietf-core-sid sounds like a natural way to place this, but what goes into what document is often a question of who has time to write something at a particular point in time.  So let's discuss this with the authors.
>> 
>> In any case, this probably should stay at the level of a suggestion more than prescribing a normative way of doing things -- the conventions we use for this may evolve faster than the rest of the technical content of draft-ietf-core-sid.
> 
> You probably want to make a clear distinction between Internet Drafts with volatile SID assignments 
> and RFCs with permanent SID assignments. 
> 
> Do you want early implementation (of modules using SID)  to be as painful as possible or as seamless as possible? 
> Renumbering SID assignments may be extremely disruptive to actual deployments. 
> Correctness of a SID file within a source document is not the same thing as correctness of all SID files 
> across an entire administrative domain. 
> 
> I agree the administration of SID assignments is out of scope for CORE WG but punting 
> the problem to vendors or operators will not be good enough. 
> 
>> Grüße, Carsten
> 
> Andy 
> 
>> _______________________________________________
>> core mailing list
>> core@ietf.org
>> https://www.ietf.org/mailman/listinfo/core [1]
> 
> _______________________________________________
> Anima mailing list
> Anima@ietf.org
> https://www.ietf.org/mailman/listinfo/anima
 

Links:
------
[1] https://www.ietf.org/mailman/listinfo/core
--=_9802736c5b204041a9a69ea98371528f
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=UTF-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3DUTF-8" /></head><body style=3D'font-size: 10pt; font-family: Verdana,Gen=
eva,sans-serif'>
Hi all,<br /><br />The numbering of the SIDs in our case should be as stabl=
e as possible after publication as RFC.<br />A permanent assignment of the =
numbers, like the content-format numbers, would be very much appreciated.<b=
r />Using the same already allocated numbers for other RFCs would be quite =
disastrous.<br /><br />Maintenance of (part of) the comi.space by a organis=
ation like IANA could be a possibility.<br /><br />Peter<br />
<p>Andy Bierman schreef op 2018-09-12 01:32:</p>
<blockquote type=3D"cite" style=3D"padding: 0 0.4em; border-left: #1010ff 2=
px solid; margin: 0"><!-- html ignored --><!-- head ignored --><!-- meta ig=
nored -->
<div dir=3D"ltr"><br />
<div class=3D"gmail_extra"><br />
<div class=3D"gmail_quote">On Tue, Sep 11, 2018 at 3:12 PM, Carsten Bormann=
 <span>&lt;<a href=3D"mailto:cabo@tzi.org" rel=3D"noreferrer">cabo@tzi.org<=
/a>&gt;</span> wrote:<br />
<blockquote class=3D"gmail_quote" style=3D"margin: 0 0 0 .8ex; border-left:=
 1px #ccc solid; padding-left: 1ex;">On Sep 11, 2018, at 22:25, Michael Ric=
hardson &lt;<a href=3D"mailto:mcr+ietf@sandelman.ca" rel=3D"noreferrer">mcr=
+ietf@sandelman.ca</a>&gt; wrote:<br /> &gt; <br /> &gt; SHOULD ietf-core-s=
id say something about this?<br /><br /> Yes, we should have a common way o=
f handling SID allocations in RFCs.<br /><br /> draft-ietf-core-sid sounds =
like a natural way to place this, but what goes into what document is often=
 a question of who has time to write something at a particular point in tim=
e.&nbsp; So let's discuss this with the authors.<br /><br /> In any case, t=
his probably should stay at the level of a suggestion more than prescribing=
 a normative way of doing things &mdash; the conventions we use for this ma=
y evolve faster than the rest of the technical content of draft-ietf-core-s=
id.<br /><br /></blockquote>
<div>&nbsp;</div>
<div>You probably want to make a clear distinction between Internet Drafts =
with volatile SID assignments</div>
<div>and RFCs with permanent SID assignments.</div>
<div>&nbsp;</div>
<div>Do you want early implementation (of modules using SID) &nbsp;to be as=
 painful as possible or as seamless as possible?</div>
<div>Renumbering SID assignments may be extremely disruptive to actual depl=
oyments.</div>
<div>Correctness of a SID file within a source document is not the same thi=
ng as correctness of all SID files</div>
<div>across an entire administrative domain.</div>
<div>&nbsp;</div>
<div>I agree the administration of SID assignments is out of scope for CORE=
 WG but punting</div>
<div>the problem to vendors or operators will not be good enough.</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<blockquote class=3D"gmail_quote" style=3D"margin: 0 0 0 .8ex; border-left:=
 1px #ccc solid; padding-left: 1ex;">Gr&uuml;&szlig;e, Carsten</blockquote>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>Andy</div>
<div>&nbsp;</div>
<blockquote class=3D"gmail_quote" style=3D"margin: 0 0 0 .8ex; border-left:=
 1px #ccc solid; padding-left: 1ex;"><br /> ______________________________<=
wbr />_________________<br /> core mailing list<br /><a href=3D"mailto:core=
@ietf.org" rel=3D"noreferrer">core@ietf.org</a><br /><a href=3D"https://www=
=2Eietf.org/mailman/listinfo/core" target=3D"_blank" rel=3D"noreferrer">htt=
ps://www.ietf.org/mailman/<wbr />listinfo/core</a></blockquote>
</div>
</div>
</div>
<br />
<div class=3D"pre" style=3D"margin: 0; padding: 0; font-family: monospace">=
_______________________________________________<br /> Anima mailing list<br=
 /><a href=3D"mailto:Anima@ietf.org" rel=3D"noreferrer">Anima@ietf.org</a><=
br /><a href=3D"https://www.ietf.org/mailman/listinfo/anima" target=3D"_bla=
nk" rel=3D"noreferrer">https://www.ietf.org/mailman/listinfo/anima</a></div=
>
</blockquote>
</body></html>

--=_9802736c5b204041a9a69ea98371528f--


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Subject: Re: [core] [Anima]   documenting SID usage in IETF specification
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> On Sep 12, 2018, at 17:15, Peter van der Stok <stokcons@bbhmail.nl> =
wrote:
>=20
> Hi all,
>=20
> The numbering of the SIDs in our case should be as stable as possible =
after publication as RFC.
> A permanent assignment of the numbers, like the content-format =
numbers, would be very much appreciated.
> Using the same already allocated numbers for other RFCs would be quite =
disastrous.

Yes, I think that part is clear.

What Andy pointed out is that we also need to have an idea of how to =
evolve a draft in a way that minimizes damage from changing those =
numbers during the development of that draft.  So we need to start =
allocating and managing SID numbers early in their lifetime, at least =
from the point of time when a draft is becoming an =E2=80=9Cimplementation=
 draft=E2=80=9D (as opposed to just an idea that wants to be discussed). =
 That is not something we have traditionally done with IANA =
registrations, which are traditionally considered a scarce resource and =
thus should only be assigned to finished (or near-finished, hence =
=E2=80=9Cearly allocations=E2=80=9D) protocols.

My proposal would be:

=E2=80=94 have a more explicit way of designating drafts as =
Implementation Drafts.   Basically, any SIDs allocated before that are =
without protection,  but once we have an Implementation Draft, the SIDs =
used in that will not be re-used.  (Intermediate versions between =
Implementation Drafts would again have any new SIDs in unprotected state =
until another Implementation Draft is declared.)

=E2=80=94 have a way to include the SID file in the document (draft, =
RFC).  This is not beautiful, but unless we invent another =
representation for that information, that is the interchangeable form.  =
(If we do invent another representation, maybe we should always use =
that?)

Gr=C3=BC=C3=9Fe, Carsten


>=20
> Maintenance of (part of) the comi.space by a organisation like IANA =
could be a possibility.
>=20
> Peter
> Andy Bierman schreef op 2018-09-12 01:32:
>=20
>>=20
>>=20
>> On Tue, Sep 11, 2018 at 3:12 PM, Carsten Bormann <cabo@tzi.org> =
wrote:
>> On Sep 11, 2018, at 22:25, Michael Richardson <mcr+ietf@sandelman.ca> =
wrote:
>> >=20
>> > SHOULD ietf-core-sid say something about this?
>>=20
>> Yes, we should have a common way of handling SID allocations in RFCs.
>>=20
>> draft-ietf-core-sid sounds like a natural way to place this, but what =
goes into what document is often a question of who has time to write =
something at a particular point in time.  So let's discuss this with the =
authors.
>>=20
>> In any case, this probably should stay at the level of a suggestion =
more than prescribing a normative way of doing things =E2=80=94 the =
conventions we use for this may evolve faster than the rest of the =
technical content of draft-ietf-core-sid.
>>=20
>> =20
>> You probably want to make a clear distinction between Internet Drafts =
with volatile SID assignments
>> and RFCs with permanent SID assignments.
>> =20
>> Do you want early implementation (of modules using SID)  to be as =
painful as possible or as seamless as possible?
>> Renumbering SID assignments may be extremely disruptive to actual =
deployments.
>> Correctness of a SID file within a source document is not the same =
thing as correctness of all SID files
>> across an entire administrative domain.
>> =20
>> I agree the administration of SID assignments is out of scope for =
CORE WG but punting
>> the problem to vendors or operators will not be good enough.
>> =20
>> =20
>> =20
>> Gr=C3=BC=C3=9Fe, Carsten
>> =20
>> =20
>> Andy
>> =20
>>=20
>> _______________________________________________
>> core mailing list
>> core@ietf.org
>> https://www.ietf.org/mailman/listinfo/core
>>=20
>> _______________________________________________
>> Anima mailing list
>> Anima@ietf.org
>> https://www.ietf.org/mailman/listinfo/anima


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From: Andy Bierman <andy@yumaworks.com>
Date: Wed, 12 Sep 2018 09:32:10 -0700
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To: Carsten Bormann <cabo@tzi.org>
Cc: peter van der Stok <consultancy@vanderstok.org>, anima@ietf.org, Core <core@ietf.org>
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Subject: Re: [core] [Anima]  documenting SID usage in IETF specification
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On Wed, Sep 12, 2018 at 9:14 AM, Carsten Bormann <cabo@tzi.org> wrote:

>
>
> > On Sep 12, 2018, at 17:15, Peter van der Stok <stokcons@bbhmail.nl>
> wrote:
> >
> > Hi all,
> >
> > The numbering of the SIDs in our case should be as stable as possible
> after publication as RFC.
> > A permanent assignment of the numbers, like the content-format numbers,
> would be very much appreciated.
> > Using the same already allocated numbers for other RFCs would be quite
> disastrous.
>
> Yes, I think that part is clear.
>
> What Andy pointed out is that we also need to have an idea of how to
> evolve a draft in a way that minimizes damage from changing those numbers
> during the development of that draft.  So we need to start allocating and
> managing SID numbers early in their lifetime, at least from the point of
> time when a draft is becoming an =E2=80=9Cimplementation draft=E2=80=9D (=
as opposed to just
> an idea that wants to be discussed).  That is not something we have
> traditionally done with IANA registrations, which are traditionally
> considered a scarce resource and thus should only be assigned to finished
> (or near-finished, hence =E2=80=9Cearly allocations=E2=80=9D) protocols.
>
> My proposal would be:
>
> =E2=80=94 have a more explicit way of designating drafts as Implementatio=
n
> Drafts.   Basically, any SIDs allocated before that are without
> protection,  but once we have an Implementation Draft, the SIDs used in
> that will not be re-used.  (Intermediate versions between Implementation
> Drafts would again have any new SIDs in unprotected state until another
> Implementation Draft is declared.)
>
> =E2=80=94 have a way to include the SID file in the document (draft, RFC)=
.  This
> is not beautiful, but unless we invent another representation for that
> information, that is the interchangeable form.  (If we do invent another
> representation, maybe we should always use that?)
>
>
Thanks for summarizing the issue and also for a very practical solution.
The SID file needs to be included in the I-Ds and the RFC.
The Implementation Draft idea sounds like the old discussions about
"working group snapshots"
but it very useful info to know the difference:

   - the module and SID assignments are not stable at all and MAY change at
any time in the future
   - the module and SID assignments are from an Implementation Draft and
SHOULD remain the same in future revisions
   - the module and SID assignments are from an RFC and MUST remain the
same in future revisions


Gr=C3=BC=C3=9Fe, Carsten
>
>
Andy


>
> >
> > Maintenance of (part of) the comi.space by a organisation like IANA
> could be a possibility.
> >
> > Peter
> > Andy Bierman schreef op 2018-09-12 01:32:
> >
> >>
> >>
> >> On Tue, Sep 11, 2018 at 3:12 PM, Carsten Bormann <cabo@tzi.org> wrote:
> >> On Sep 11, 2018, at 22:25, Michael Richardson <mcr+ietf@sandelman.ca>
> wrote:
> >> >
> >> > SHOULD ietf-core-sid say something about this?
> >>
> >> Yes, we should have a common way of handling SID allocations in RFCs.
> >>
> >> draft-ietf-core-sid sounds like a natural way to place this, but what
> goes into what document is often a question of who has time to write
> something at a particular point in time.  So let's discuss this with the
> authors.
> >>
> >> In any case, this probably should stay at the level of a suggestion
> more than prescribing a normative way of doing things =E2=80=94 the conve=
ntions we
> use for this may evolve faster than the rest of the technical content of
> draft-ietf-core-sid.
> >>
> >>
> >> You probably want to make a clear distinction between Internet Drafts
> with volatile SID assignments
> >> and RFCs with permanent SID assignments.
> >>
> >> Do you want early implementation (of modules using SID)  to be as
> painful as possible or as seamless as possible?
> >> Renumbering SID assignments may be extremely disruptive to actual
> deployments.
> >> Correctness of a SID file within a source document is not the same
> thing as correctness of all SID files
> >> across an entire administrative domain.
> >>
> >> I agree the administration of SID assignments is out of scope for CORE
> WG but punting
> >> the problem to vendors or operators will not be good enough.
> >>
> >>
> >>
> >> Gr=C3=BC=C3=9Fe, Carsten
> >>
> >>
> >> Andy
> >>
> >>
> >> _______________________________________________
> >> core mailing list
> >> core@ietf.org
> >> https://www.ietf.org/mailman/listinfo/core
> >>
> >> _______________________________________________
> >> Anima mailing list
> >> Anima@ietf.org
> >> https://www.ietf.org/mailman/listinfo/anima
>
>

--000000000000d6a0230575af2144
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div c=
lass=3D"gmail_quote">On Wed, Sep 12, 2018 at 9:14 AM, Carsten Bormann <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:cabo@tzi.org" target=3D"_blank">cabo@tzi=
.org</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:=
1ex"><br>
<br>
&gt; On Sep 12, 2018, at 17:15, Peter van der Stok &lt;<a href=3D"mailto:st=
okcons@bbhmail.nl">stokcons@bbhmail.nl</a>&gt; wrote:<br>
&gt; <br>
&gt; Hi all,<br>
&gt; <br>
&gt; The numbering of the SIDs in our case should be as stable as possible =
after publication as RFC.<br>
&gt; A permanent assignment of the numbers, like the content-format numbers=
, would be very much appreciated.<br>
&gt; Using the same already allocated numbers for other RFCs would be quite=
 disastrous.<br>
<br>
Yes, I think that part is clear.<br>
<br>
What Andy pointed out is that we also need to have an idea of how to evolve=
 a draft in a way that minimizes damage from changing those numbers during =
the development of that draft.=C2=A0 So we need to start allocating and man=
aging SID numbers early in their lifetime, at least from the point of time =
when a draft is becoming an =E2=80=9Cimplementation draft=E2=80=9D (as oppo=
sed to just an idea that wants to be discussed).=C2=A0 That is not somethin=
g we have traditionally done with IANA registrations, which are traditional=
ly considered a scarce resource and thus should only be assigned to finishe=
d (or near-finished, hence =E2=80=9Cearly allocations=E2=80=9D) protocols.<=
br>
<br>
My proposal would be:<br>
<br>
=E2=80=94 have a more explicit way of designating drafts as Implementation =
Drafts.=C2=A0 =C2=A0Basically, any SIDs allocated before that are without p=
rotection,=C2=A0 but once we have an Implementation Draft, the SIDs used in=
 that will not be re-used.=C2=A0 (Intermediate versions between Implementat=
ion Drafts would again have any new SIDs in unprotected state until another=
 Implementation Draft is declared.)<br>
<br>
=E2=80=94 have a way to include the SID file in the document (draft, RFC).=
=C2=A0 This is not beautiful, but unless we invent another representation f=
or that information, that is the interchangeable form.=C2=A0 (If we do inve=
nt another representation, maybe we should always use that?)<br>
<br></blockquote><div><br></div><div>Thanks for summarizing the issue and a=
lso for a very practical solution.</div><div>The SID file needs to be inclu=
ded in the I-Ds and the RFC.</div><div>The Implementation Draft idea sounds=
 like the old discussions about &quot;working group snapshots&quot;</div><d=
iv>but it very useful info to know the difference:</div><div><br></div><div=
>=C2=A0 =C2=A0- the module and SID assignments are not stable at all and MA=
Y change at any time in the future</div><div>=C2=A0 =C2=A0- the module and =
SID assignments are from an Implementation Draft and SHOULD remain the same=
 in future revisions</div><div><div>=C2=A0 =C2=A0- the module and SID assig=
nments are from an RFC and MUST remain the same in future revisions</div></=
div><div><br></div><div><br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">
Gr=C3=BC=C3=9Fe, Carsten<br>
<br></blockquote><div><br></div><div>Andy</div><div>=C2=A0</div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex">
<br>
&gt; <br>
&gt; Maintenance of (part of) the comi.space by a organisation like IANA co=
uld be a possibility.<br>
&gt; <br>
&gt; Peter<br>
&gt; Andy Bierman schreef op 2018-09-12 01:32:<br>
&gt; <br>
&gt;&gt; <br>
&gt;&gt; <br>
&gt;&gt; On Tue, Sep 11, 2018 at 3:12 PM, Carsten Bormann &lt;<a href=3D"ma=
ilto:cabo@tzi.org">cabo@tzi.org</a>&gt; wrote:<br>
&gt;&gt; On Sep 11, 2018, at 22:25, Michael Richardson &lt;<a href=3D"mailt=
o:mcr%2Bietf@sandelman.ca">mcr+ietf@sandelman.ca</a>&gt; wrote:<br>
&gt;&gt; &gt; <br>
&gt;&gt; &gt; SHOULD ietf-core-sid say something about this?<br>
&gt;&gt; <br>
&gt;&gt; Yes, we should have a common way of handling SID allocations in RF=
Cs.<br>
&gt;&gt; <br>
&gt;&gt; draft-ietf-core-sid sounds like a natural way to place this, but w=
hat goes into what document is often a question of who has time to write so=
mething at a particular point in time.=C2=A0 So let&#39;s discuss this with=
 the authors.<br>
&gt;&gt; <br>
&gt;&gt; In any case, this probably should stay at the level of a suggestio=
n more than prescribing a normative way of doing things =E2=80=94 the conve=
ntions we use for this may evolve faster than the rest of the technical con=
tent of draft-ietf-core-sid.<br>
&gt;&gt; <br>
&gt;&gt;=C2=A0 <br>
&gt;&gt; You probably want to make a clear distinction between Internet Dra=
fts with volatile SID assignments<br>
&gt;&gt; and RFCs with permanent SID assignments.<br>
&gt;&gt;=C2=A0 <br>
&gt;&gt; Do you want early implementation (of modules using SID)=C2=A0 to b=
e as painful as possible or as seamless as possible?<br>
&gt;&gt; Renumbering SID assignments may be extremely disruptive to actual =
deployments.<br>
&gt;&gt; Correctness of a SID file within a source document is not the same=
 thing as correctness of all SID files<br>
&gt;&gt; across an entire administrative domain.<br>
&gt;&gt;=C2=A0 <br>
&gt;&gt; I agree the administration of SID assignments is out of scope for =
CORE WG but punting<br>
&gt;&gt; the problem to vendors or operators will not be good enough.<br>
&gt;&gt;=C2=A0 <br>
&gt;&gt;=C2=A0 <br>
&gt;&gt;=C2=A0 <br>
&gt;&gt; Gr=C3=BC=C3=9Fe, Carsten<br>
&gt;&gt;=C2=A0 <br>
&gt;&gt;=C2=A0 <br>
&gt;&gt; Andy<br>
&gt;&gt;=C2=A0 <br>
&gt;&gt; <br>
&gt;&gt; ______________________________<wbr>_________________<br>
&gt;&gt; core mailing list<br>
&gt;&gt; <a href=3D"mailto:core@ietf.org">core@ietf.org</a><br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/core" rel=3D"nore=
ferrer" target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/core</=
a><br>
&gt;&gt; <br>
&gt;&gt; ______________________________<wbr>_________________<br>
&gt;&gt; Anima mailing list<br>
&gt;&gt; <a href=3D"mailto:Anima@ietf.org">Anima@ietf.org</a><br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/anima" rel=3D"nor=
eferrer" target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/anima=
</a><br>
<br>
</blockquote></div><br></div></div></div>

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Subject: Re: [core] [Anima]  documenting SID usage in IETF specification
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{removed anima from CC list}

Carsten Bormann <cabo@tzi.org> wrote:
    > What Andy pointed out is that we also need to have an idea of how to
    > evolve a draft in a way that minimizes damage from changing those
    > numbers during the development of that draft.  So we need to start
    > allocating and managing SID numbers early in their lifetime, at least
    > from the point of time when a draft is becoming an =E2=80=9Cimplement=
ation
    > draft=E2=80=9D (as opposed to just an idea that wants to be discussed=
).  That

Agreed.
I think that we will typically be need about ~100 per draft, sometimes as
many as 1000, but never 10,000.  100 is a very small number compared to the
size of the SID space.

I think that the early allocation process will work fine, once we have a
registry to allocate against.  The comi.space mechanism is even lighter
weight.

    > =E2=80=94 have a more explicit way of designating drafts as Implement=
ation
    > Drafts.  Basically, any SIDs allocated before that are without
    > protection, but once we have an Implementation Draft, the SIDs used in
    > that will not be re-used.  (Intermediate versions between
    > Implementation Drafts would again have any new SIDs in unprotected
    > state until another Implementation Draft is declared.)

I think that we used to call these "Proposed standards" :-)
I'm not sure we need to have this designation.  I think that SID numbers are
cheap enough that it's okay if some drafts consume some and then get
abandonned.   The numbers could be recycled 6 months after the draft expire=
s.

    > =E2=80=94 have a way to include the SID file in the document (draft, =
RFC).
    > This is not beautiful, but unless we invent another representation for
    > that information, that is the interchangeable form.  (If we do invent
    > another representation, maybe we should always use that?)

I suggest it be included as an appendix.

=2D-
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -=3D IPv6 IoT consulting =3D-




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Andy Bierman <andy@yumaworks.com> wrote:
    > - the module and SID assignments are not stable at all and MAY change
    > at any time in the future

any individual submission would be in this by default.

    > - the module and SID assignments are from an Implementation Draft and
    > SHOULD remain the same in future revisions

any WG adopted draft should be in this category.

    > - the module and SID assignments are from an RFC and MUST remain the
    > same in future revisions

Speaks for itself.

The questions is where are the SIDs allocated for the three different
categories?  Does it matter?

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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Subject: Re: [core] [Yot] [Anima] documenting SID usage in IETF specification (fwd) Michael Richardson: [Anima] documenting SID usage in IETF specification
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On Sep 13, 2018, at 09:58, Juergen Schoenwaelder =
<j.schoenwaelder@jacobs-university.de> wrote:
>=20
> The sids are machine generated, no? If so, why can't we make IANA
> maintain the sids?

The machine generation is eady for modules that don=E2=80=99t have a SID =
history.
Always generating SIDs at IANA would mean that IANA would need to =
maintain the SID history as well.
As I mentioned when discussion draft evolution, that may be finer =
grained than what IANA cares about.
So how do we feed the history to IANA?

Gr=C3=BC=C3=9Fe, Carsten


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On Sep 13, 2018, at 17:23, Michael Richardson <mcr+ietf@sandelman.ca> =
wrote:
>=20
>> - the module and SID assignments are from an Implementation Draft and
>> SHOULD remain the same in future revisions
>=20
> any WG adopted draft should be in this category.

We could do this.

Other WGs have benefitted from not calling every single I-D revision an =
implementation draft.
So we wouldn=E2=80=99t have to maintain short-lived mistakes during =
evolution of the WG document.

Gr=C3=BC=C3=9Fe, Carsten


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On Thu, Sep 13, 2018 at 8:18 AM, Michael Richardson <mcr+ietf@sandelman.ca>
wrote:

>
> {removed anima from CC list}
>
> Carsten Bormann <cabo@tzi.org> wrote:
>     > What Andy pointed out is that we also need to have an idea of how t=
o
>     > evolve a draft in a way that minimizes damage from changing those
>     > numbers during the development of that draft.  So we need to start
>     > allocating and managing SID numbers early in their lifetime, at lea=
st
>     > from the point of time when a draft is becoming an =E2=80=9Cimpleme=
ntation
>     > draft=E2=80=9D (as opposed to just an idea that wants to be discuss=
ed).  That
>
> Agreed.
> I think that we will typically be need about ~100 per draft, sometimes as
> many as 1000, but never 10,000.  100 is a very small number compared to t=
he
> size of the SID space.
>
> I think that the early allocation process will work fine, once we have a
> registry to allocate against.  The comi.space mechanism is even lighter
> weight.
>
>     > =E2=80=94 have a more explicit way of designating drafts as Impleme=
ntation
>     > Drafts.  Basically, any SIDs allocated before that are without
>     > protection, but once we have an Implementation Draft, the SIDs used
> in
>     > that will not be re-used.  (Intermediate versions between
>     > Implementation Drafts would again have any new SIDs in unprotected
>     > state until another Implementation Draft is declared.)
>
> I think that we used to call these "Proposed standards" :-)
> I'm not sure we need to have this designation.  I think that SID numbers
> are
> cheap enough that it's okay if some drafts consume some and then get
> abandonned.   The numbers could be recycled 6 months after the draft
> expires.
>
>

IMO you had it right up to the last sentence.
There are not port numbers. There are 2^^64 of them.
Recycling SID numbers would be a recipe for disaster.
The "experimental" SID space is especially problematic in this regard.
Within a deployment there will be server code from all different dates,
so being able to declare the SID space clean at 1 single point in time is
not good enough.

For "textual YANG" this is not a problem because there is very low
probability
that module names or module namespace URIs will collide.




>     > =E2=80=94 have a way to include the SID file in the document (draft=
, RFC).
>     > This is not beautiful, but unless we invent another representation
> for
>     > that information, that is the interchangeable form.  (If we do inve=
nt
>     > another representation, maybe we should always use that?)
>
> I suggest it be included as an appendix.
>
> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
>  -=3D IPv6 IoT consulting =3D-
>
>
>
>
Andy

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Thu, Sep 13, 2018 at 8:18 AM, Michael Richardson <span dir=3D"ltr">&=
lt;<a href=3D"mailto:mcr+ietf@sandelman.ca" target=3D"_blank">mcr+ietf@sand=
elman.ca</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
{removed anima from CC list}<br>
<br>
Carsten Bormann &lt;<a href=3D"mailto:cabo@tzi.org">cabo@tzi.org</a>&gt; wr=
ote:<br>
=C2=A0 =C2=A0 &gt; What Andy pointed out is that we also need to have an id=
ea of how to<br>
=C2=A0 =C2=A0 &gt; evolve a draft in a way that minimizes damage from chang=
ing those<br>
=C2=A0 =C2=A0 &gt; numbers during the development of that draft.=C2=A0 So w=
e need to start<br>
=C2=A0 =C2=A0 &gt; allocating and managing SID numbers early in their lifet=
ime, at least<br>
=C2=A0 =C2=A0 &gt; from the point of time when a draft is becoming an =E2=
=80=9Cimplementation<br>
=C2=A0 =C2=A0 &gt; draft=E2=80=9D (as opposed to just an idea that wants to=
 be discussed).=C2=A0 That<br>
<br>
Agreed.<br>
I think that we will typically be need about ~100 per draft, sometimes as<b=
r>
many as 1000, but never 10,000.=C2=A0 100 is a very small number compared t=
o the<br>
size of the SID space.<br>
<br>
I think that the early allocation process will work fine, once we have a<br=
>
registry to allocate against.=C2=A0 The comi.space mechanism is even lighte=
r<br>
weight.<br>
<br>
=C2=A0 =C2=A0 &gt; =E2=80=94 have a more explicit way of designating drafts=
 as Implementation<br>
=C2=A0 =C2=A0 &gt; Drafts.=C2=A0 Basically, any SIDs allocated before that =
are without<br>
=C2=A0 =C2=A0 &gt; protection, but once we have an Implementation Draft, th=
e SIDs used in<br>
=C2=A0 =C2=A0 &gt; that will not be re-used.=C2=A0 (Intermediate versions b=
etween<br>
=C2=A0 =C2=A0 &gt; Implementation Drafts would again have any new SIDs in u=
nprotected<br>
=C2=A0 =C2=A0 &gt; state until another Implementation Draft is declared.)<b=
r>
<br>
I think that we used to call these &quot;Proposed standards&quot; :-)<br>
I&#39;m not sure we need to have this designation.=C2=A0 I think that SID n=
umbers are<br>
cheap enough that it&#39;s okay if some drafts consume some and then get<br=
>
abandonned.=C2=A0 =C2=A0The numbers could be recycled 6 months after the dr=
aft expires.<br>
<br></blockquote><div><br></div><div><br></div><div>IMO you had it right up=
 to the last sentence.</div><div>There are not port numbers. There are 2^^6=
4 of them.</div><div>Recycling SID numbers would be a recipe for disaster.<=
/div><div>The &quot;experimental&quot; SID space is especially problematic =
in this regard.</div><div>Within a deployment there will be server code fro=
m all different dates,</div><div>so being able to declare the SID space cle=
an at 1 single point in time is not good enough.</div><div><br></div><div>F=
or &quot;textual YANG&quot; this is not a problem because there is very low=
 probability</div><div>that module names or module namespace URIs will coll=
ide.</div><div><br></div><div><br></div><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">
=C2=A0 =C2=A0 &gt; =E2=80=94 have a way to include the SID file in the docu=
ment (draft, RFC).<br>
=C2=A0 =C2=A0 &gt; This is not beautiful, but unless we invent another repr=
esentation for<br>
=C2=A0 =C2=A0 &gt; that information, that is the interchangeable form.=C2=
=A0 (If we do invent<br>
=C2=A0 =C2=A0 &gt; another representation, maybe we should always use that?=
)<br>
<br>
I suggest it be included as an appendix.<br>
<br>
--<br>
Michael Richardson &lt;<a href=3D"mailto:mcr%2BIETF@sandelman.ca">mcr+IETF@=
sandelman.ca</a>&gt;, Sandelman Software Works<br>
=C2=A0-=3D IPv6 IoT consulting =3D-<br>
<br>
<br>
<br>
</blockquote></div><br></div><div class=3D"gmail_extra">Andy</div><div clas=
s=3D"gmail_extra"><br></div></div>

--00000000000087b8640575c29dea--


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--=-=-=
Content-Type: text/plain


Andy Bierman <andy@yumaworks.com> wrote:
    > I think that we used to call these "Proposed standards" :-)
    > I'm not sure we need to have this designation. I think that SID
    > numbers are
    > cheap enough that it's okay if some drafts consume some and then
    > get
    > abandonned. The numbers could be recycled 6 months after the draft
    > expires.

    > IMO you had it right up to the last sentence.
    > There are not port numbers. There are 2^^64 of them.

Agreed.  So when recycled, they go to the end of the 2^^64 list :-)

    > The "experimental" SID space is especially problematic in this regard.
    > Within a deployment there will be server code from all different
    > dates,
    > so being able to declare the SID space clean at 1 single point in time
    > is not good enough.

Stuff in the experimental SID space is a problem.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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Subject: Re: [core] [Anima]  documenting SID usage in IETF specification
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--000000000000010cee0575c84828
Content-Type: text/plain; charset="UTF-8"

On Thu, Sep 13, 2018 at 1:50 PM, Michael Richardson <mcr+ietf@sandelman.ca>
wrote:

>
> Andy Bierman <andy@yumaworks.com> wrote:
>     > I think that we used to call these "Proposed standards" :-)
>     > I'm not sure we need to have this designation. I think that SID
>     > numbers are
>     > cheap enough that it's okay if some drafts consume some and then
>     > get
>     > abandonned. The numbers could be recycled 6 months after the draft
>     > expires.
>
>     > IMO you had it right up to the last sentence.
>     > There are not port numbers. There are 2^^64 of them.
>
> Agreed.  So when recycled, they go to the end of the 2^^64 list :-)
>
>     > The "experimental" SID space is especially problematic in this
> regard.
>     > Within a deployment there will be server code from all different
>     > dates,
>     > so being able to declare the SID space clean at 1 single point in
> time
>     > is not good enough.
>
> Stuff in the experimental SID space is a problem.
>
>
Yes -- it is the wrong way of looking at it.
There is really only "global" and "local" SIDs.

IMO it is better to reserve a range where it is clear there are no
expectations
that the SID assignments are real. (Imagine if we told everybody to name
their YANG module my-module.yang -- these experimental SIDs are like that)

There will be modules that do not get registered (for various reasons),
or that simply get used/tested before they are registered.


Andy



> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
>  -= IPv6 IoT consulting =-
>
>
>
>

--000000000000010cee0575c84828
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Thu, Sep 13, 2018 at 1:50 PM, Michael Richardson <span dir=3D"ltr">&=
lt;<a href=3D"mailto:mcr+ietf@sandelman.ca" target=3D"_blank">mcr+ietf@sand=
elman.ca</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Andy Bierman &lt;<a href=3D"mailto:andy@yumaworks.com">andy@yumaworks.com</=
a>&gt; wrote:<br>
=C2=A0 =C2=A0 &gt; I think that we used to call these &quot;Proposed standa=
rds&quot; :-)<br>
=C2=A0 =C2=A0 &gt; I&#39;m not sure we need to have this designation. I thi=
nk that SID<br>
=C2=A0 =C2=A0 &gt; numbers are<br>
=C2=A0 =C2=A0 &gt; cheap enough that it&#39;s okay if some drafts consume s=
ome and then<br>
=C2=A0 =C2=A0 &gt; get<br>
=C2=A0 =C2=A0 &gt; abandonned. The numbers could be recycled 6 months after=
 the draft<br>
=C2=A0 =C2=A0 &gt; expires.<br>
<br>
=C2=A0 =C2=A0 &gt; IMO you had it right up to the last sentence.<br>
=C2=A0 =C2=A0 &gt; There are not port numbers. There are 2^^64 of them.<br>
<br>
Agreed.=C2=A0 So when recycled, they go to the end of the 2^^64 list :-)<br=
>
<br>
=C2=A0 =C2=A0 &gt; The &quot;experimental&quot; SID space is especially pro=
blematic in this regard.<br>
=C2=A0 =C2=A0 &gt; Within a deployment there will be server code from all d=
ifferent<br>
=C2=A0 =C2=A0 &gt; dates,<br>
=C2=A0 =C2=A0 &gt; so being able to declare the SID space clean at 1 single=
 point in time<br>
=C2=A0 =C2=A0 &gt; is not good enough.<br>
<br>
Stuff in the experimental SID space is a problem.<br>
<br></blockquote><div><br></div><div>Yes -- it is the wrong way of looking =
at it.</div><div>There is really only &quot;global&quot; and &quot;local&qu=
ot; SIDs.</div><div><br></div><div>IMO it is better to reserve a range wher=
e it is clear there are no expectations</div><div>that the SID assignments =
are real. (Imagine if we told everybody to name</div><div>their YANG module=
 my-module.yang -- these experimental SIDs are like that)</div><div><br></d=
iv><div>There will be modules that do not get registered (for various reaso=
ns),</div><div>or that simply get used/tested before they are registered.</=
div><div><br></div><div><br></div><div>Andy</div><div><br></div><div>=C2=A0=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex">
--<br>
Michael Richardson &lt;<a href=3D"mailto:mcr%2BIETF@sandelman.ca">mcr+IETF@=
sandelman.ca</a>&gt;, Sandelman Software Works<br>
=C2=A0-=3D IPv6 IoT consulting =3D-<br>
<br>
<br>
<br>
</blockquote></div><br></div></div>

--000000000000010cee0575c84828--


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Subject: [core] I-D Action: draft-ietf-core-yang-cbor-07.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Constrained RESTful Environments WG of the IETF.

        Title           : CBOR Encoding of Data Modeled with YANG
        Authors         : Michel Veillette
                          Alexander Pelov
                          Abhinav Somaraju
                          Randy Turner
                          Ana Minaburo
	Filename        : draft-ietf-core-yang-cbor-07.txt
	Pages           : 35
	Date            : 2018-09-14

Abstract:
   This document defines encoding rules for serializing configuration
   data, state data, RPC input and RPC output, Action input, Action
   output and notifications defined within YANG modules using the
   Concise Binary Object Representation (CBOR) [RFC7049].


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-core-yang-cbor/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-core-yang-cbor-07
https://datatracker.ietf.org/doc/html/draft-ietf-core-yang-cbor-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-core-yang-cbor-07


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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Subject: [core] core - New Meeting Session Request for IETF 103
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A new meeting session request has just been submitted by Alexey Melnikov, a ART Area Director.


---------------------------------------------------------
Working Group Name: Constrained RESTful Environments
Area Name: Applications and Real-Time Area
Session Requester: Alexey Melnikov

Number of Sessions: 2
Length of Session(s):  1.5 Hours, 1.5 Hours
Number of Attendees: 60
Conflicts to Avoid: 
 First Priority: cbor httpbis artarea t2trg suit ace lpwan 6lo roll teep
 Second Priority: dnssd saag irtfopen 6tisch netconf netmod sacm emu jmap extra cfrg
 Third Priority: lwig detnet quic v6ops opsarea icnrg


People who must be present:
  Carsten Bormann
  Alexey Melnikov
  Jaime Jimenez

Resources Requested:

Special Requests:
  Please also avoid any potentially IoT related BOFs that might come up (atick, amp).
Prefer some time between the two meetings (48 h or more).
---------------------------------------------------------


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From: Andy Bierman <andy@yumaworks.com>
Date: Sun, 16 Sep 2018 11:56:11 -0700
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Subject: [core] comments on draft-ietf-core-yang-cbor-07.txt
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Hi,

I have a few comments on the YANG to CBOR draft.
In general it is very close to being complete.


1) RFC 7951 references

   The following terms are defined in [RFC7951]:

   o  member name

   o  name of an identity


Actually, RFC 7951 does not define these terms. It says RFC 5234 defines
the member-name
syntax,. IMO, this term should really be linked an 'identifier' as defined
in RFC 7950.
Each datadef-stmt has its own specific definition, e.g. container:
https://tools.ietf.org/html/rfc7950#section-7.5

The mapping should be defined directly from YANG to CBOR, as the draft name
suggests.

2) sec 4.5 anydata

The text should mention that SID encoding is not possible since child nodes
of an anydata do not exist in the schema.

The example seems to be wrong. It does not have the member-names
port-name and port-fault in the notation.

3) sec. 4.6 anyxml

The actual usage of anyxml is really as a container, same as anydata,
so the example is confusing. This should be encoded the same as anydata
if possible.

Not sure why the 2nd sentence is there:

sec 4.6, para 1:

   An anyxml schema node is used to serialize an arbitrary CBOR content,
   i.e., its value can be any CBOR binary object. anyxml value MAY
   contain CBOR data items tagged with one of the tag listed in
   Section 8.1, these tags shall be supported.

If this is a binary object then how can it have nested data nodes with data
types?
I suggest that anyxml can be treated as anydata if it does not contain any
mixed-mode content or processing instructions.

NEW:

   An anyxml schema node is used to serialize an arbitrary CBOR content,
   i.e., its value can be any CBOR binary object. If the anyxml instance
   data contains only YANG data nodes, then it MAY be encoded the same
   as an anydata object.



Andy

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr">Hi,<div><br></div><div>I have a few comments on the YANG to CBOR =
draft.</div><div>In general it is very close to being complete.</div><div><=
br></div><div><br></div><div>1) RFC 7951 references</div><div><br></div><di=
v><pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap"=
>   The following terms are defined in [RFC7951]:

   o  member name

   o  name of an identity

<br></pre>Actually, RFC 7951 does not define these terms. It says RFC 5234 =
defines the member-name</div><div>syntax,. IMO, this term should really be =
linked an &#39;identifier&#39; as defined in RFC 7950.</div><div>Each datad=
ef-stmt has its own specific definition, e.g. container:</div><div><a href=
=3D"https://tools.ietf.org/html/rfc7950#section-7.5">https://tools.ietf.org=
/html/rfc7950#section-7.5</a><br></div><div><br></div><div>The mapping shou=
ld be defined directly from YANG to CBOR, as the draft name suggests.</div>=
<div><br></div><div>2) sec 4.5 anydata</div><div><br></div><div>The text sh=
ould mention that SID encoding is not possible since child nodes</div><div>=
of an anydata do not exist in the schema.</div><div><br></div><div>The exam=
ple seems to be wrong. It does not have the member-names</div><div>port-nam=
e and port-fault in the notation.</div><div><br></div><div>3) sec. 4.6 anyx=
ml</div><div><br></div><div>The actual usage of anyxml is really as a conta=
iner, same as anydata,</div><div>so the example is confusing. This should b=
e encoded the same as anydata</div><div>if possible.</div><div><br></div><d=
iv>Not sure why the 2nd sentence is there:</div><div><br></div><div>sec 4.6=
, para 1:</div><div><pre style=3D"color:rgb(0,0,0);word-wrap:break-word;whi=
te-space:pre-wrap">   An anyxml schema node is used to serialize an arbitra=
ry CBOR content,
   i.e., its value can be any CBOR binary object. anyxml value MAY
   contain CBOR data items tagged with one of the tag listed in
   Section 8.1, these tags shall be supported.</pre>If this is a binary obj=
ect then how can it have nested data nodes with data types?</div><div>I sug=
gest that anyxml can be treated as anydata if it does not contain any</div>=
<div>mixed-mode content or processing instructions.</div><div><br></div><di=
v>NEW:</div><div><br></div><div><pre style=3D"color:rgb(0,0,0);word-wrap:br=
eak-word;white-space:pre-wrap">   An anyxml schema node is used to serializ=
e an arbitrary CBOR content,
   i.e., its value can be any CBOR binary object.=C2=A0If the anyxml instan=
ce
   data contains only YANG data nodes, then it MAY be=C2=A0encoded the same
   as an anydata object.</pre></div><div><br></div><div><br></div><div>Andy=
</div><div><br></div><div><br></div></div></div></div></div></div>

--0000000000004747810576019cad--


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Here is the meeting invitation for the next virtual interim, 2018-09-26 =
1500Z (08:00 PDT, 17:00 CEST, 23:00 China).

Gr=C3=BC=C3=9Fe, Carsten


>=20
> Hello,
> CORE Working Group invites you to join this Webex meeting.
> =20
> Virtual Interim
> Wednesday, September 26, 2018
> 3:00 pm  |  Greenwich Time (Reykjavik, GMT)  |  1 hr
> Meeting number (access code): 643 303 053
> Meeting password: constrained
>=20
>=20
> =20
> Add to Calendar =
<https://ietf.webex.com/ietf/j.php?MTID=3Dme59246d13ea8cc658dde7bf9c59dbcf=
1>=09
> When it's time, join the meeting =
<https://ietf.webex.com/ietf/j.php?MTID=3Dm79f37ae2b85061b5d0a280d44d75f13=
4>.
> =20
> Join by phone
> 1-650-479-3208 <tel:+1-650-479-3208,,*01*643303053%23%23*01*> Call-in =
toll number (US/Canada)
> =20
> Can't join the meeting? =
<https://collaborationhelp.cisco.com/article/WBX000029055>
> =20
> IMPORTANT NOTICE: Please note that this Webex service allows audio and =
other information sent during the session to be recorded, which may be =
discoverable in a legal matter. By joining this session, you =
automatically consent to such recordings. If you do not consent to being =
recorded, discuss your concerns with the host or do not join the =
session.


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Here is the meeting invitation for the next virtual interim, =
2018-09-26 1500Z (08:00 PDT, 17:00 CEST, 23:00 China).<div class=3D""><br =
class=3D""></div><div class=3D""><div class=3D"">Gr=C3=BC=C3=9Fe, =
Carsten</div><div class=3D""><br class=3D""></div><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""></div><div=
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none; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px; padding: 0px; margin: 0px;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); padding: =
5px 0px 0px;" class=3D""><table align=3D"left" style=3D"border-collapse: =
separate; border: 0px white; border-spacing: 0px; width: 525px; =
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class=3D""><td valign=3D"top" style=3D"word-wrap: break-word; =
word-break: normal; font-size: 15px; font-family: Arial; color: rgb(102, =
102, 102); padding: 0px;" class=3D""><table style=3D"border-collapse: =
separate; border: 0px white; border-spacing: 0px; width: 1159px; =
max-width: 100%; min-width: 279px !important;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 20px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(77, 77, 77); padding: 0px;" =
class=3D"">Hello,</td></tr><tr style=3D"line-height: 20px;" class=3D""><td=
 style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(77, 77, 77); padding: 10px 0px 0px;" =
class=3D"">CORE Working Group invites you to join this Webex =
meeting.</td></tr></tbody></table><table style=3D"border-collapse: =
separate; border: 0px white; border-spacing: 0px; width: 1159px; =
max-width: 100%; min-width: 279px !important;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 20px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px; height: =
20px;" class=3D"">&nbsp;</td></tr></tbody></table><table width=3D"100%" =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1159px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 16px; font-family: Arial; color: rgb(77, 77, 77); padding: =
0px;" class=3D""><b class=3D"">Virtual Interim</b></td></tr><tr =
style=3D"line-height: 20px; margin: 0px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px;" =
class=3D"">Wednesday, September 26, 2018</td></tr><tr =
style=3D"line-height: 20px; margin: 0px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px;" =
class=3D"">3:00 pm&nbsp;&nbsp;|&nbsp;&nbsp;Greenwich Time (Reykjavik, =
GMT)&nbsp;&nbsp;|&nbsp;&nbsp;1 hr</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: auto !important; max-width: 100%; min-width: 279px =
!important;" class=3D""><tbody class=3D""><tr style=3D"line-height: =
20px;" class=3D""><td style=3D"word-wrap: break-word; word-break: =
normal; font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); =
padding: 0px;" class=3D"">Meeting number (access code): 643 303 =
053</td></tr></tbody></table><table style=3D"border-collapse: separate; =
border: 0px white; border-spacing: 0px; width: auto !important; =
max-width: 100%; min-width: 279px !important;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 20px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px;" =
class=3D"">Meeting password: constrained</td></tr></tbody></table><br =
class=3D""><font size=3D"2" color=3D"#FF0000" class=3D""></font><br =
class=3D""><table style=3D"border-collapse: separate; border: 0px white; =
border-spacing: 0px; width: 1159px; max-width: 100%; min-width: 279px =
!important;" class=3D""><tbody class=3D""><tr style=3D"line-height: =
20px;" class=3D""><td style=3D"word-wrap: break-word; word-break: =
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padding: 0px; height: 20px;" =
class=3D"">&nbsp;</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
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!important;" class=3D""><tbody class=3D""><tr style=3D"line-height: =
20px;" class=3D""><td style=3D"word-wrap: break-word; word-break: =
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style=3D"line-height: 20px;" class=3D""><td align=3D"center" =
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255, 255); padding: 0px; text-decoration: none;" class=3D"">Add to =
Calendar</a></td></tr></tbody></table></td><td style=3D"word-wrap: =
break-word; word-break: normal; font-size: 15px; font-family: Arial; =
color: rgb(102, 102, 102); padding: 0px; width: auto !important;" =
class=3D""><table border=3D"0" cellpadding=3D"0" cellspacing=3D"0" =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
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!important;" class=3D""><tbody class=3D""><tr style=3D"line-height: =
20px;" class=3D""><td style=3D"word-wrap: break-word; word-break: =
normal; font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); =
padding: 0px 0px 0px 16px;" class=3D"">When it's time,<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://ietf.webex.com/ietf/j.php?MTID=3Dm79f37ae2b85061b5d0a280d4=
4d75f134" style=3D"font-size: 15px; font-family: Arial; color: rgb(0, =
175, 249); padding: 0px; text-decoration: none;" class=3D"">join the =
meeting</a>.</td></tr></tbody></table></td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1159px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 15px; font-family: Arial; color: rgb(102, 102, 102); padding: =
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style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1159px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 16px; font-family: Arial; color: rgb(102, 102, 102); padding: =
0px;" class=3D""><b class=3D"">Join by phone</b></td></tr><tr =
style=3D"line-height: 20px; margin: 0px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px;" =
class=3D""><b class=3D""><a =
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15px; font-family: Arial; color: rgb(0, 175, 249); padding: 0px; =
text-decoration: none;" class=3D"">1-650-479-3208</a></b>&nbsp;Call-in =
toll number (US/Canada)</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
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style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1159px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 13px; font-family: Arial; color: rgb(102, 102, 102); padding: =
0px;" class=3D""><a =
href=3D"https://collaborationhelp.cisco.com/article/WBX000029055" =
style=3D"font-size: 13px; font-family: Arial; color: rgb(0, 175, 249); =
padding: 0px; text-decoration: none;" class=3D"">Can't join the =
meeting?</a></td></tr></tbody></table><table style=3D"border-collapse: =
separate; border: 0px white; border-spacing: 0px; width: 1159px; =
max-width: 100%; min-width: 279px !important;" class=3D""><tbody =
class=3D""><tr style=3D"line-height: 10px;" class=3D""><td =
style=3D"word-wrap: break-word; word-break: normal; font-size: 15px; =
font-family: Arial; color: rgb(102, 102, 102); padding: 0px; height: =
10px;" class=3D"">&nbsp;</td></tr></tbody></table><table =
style=3D"border-collapse: separate; border: 0px white; border-spacing: =
0px; width: 1159px; max-width: 100%; min-width: 279px !important;" =
class=3D""><tbody class=3D""><tr style=3D"line-height: 20px;" =
class=3D""><td style=3D"word-wrap: break-word; word-break: normal; =
font-size: 12px; font-family: Arial; color: rgb(160, 160, 160); padding: =
0px;" class=3D"">IMPORTANT NOTICE: Please note that this Webex service =
allows audio and other information sent during the session to be =
recorded, which may be discoverable in a legal matter. By joining this =
session, you automatically consent to such recordings. If you do not =
consent to being recorded, discuss your concerns with the host or do not =
join the =
session.</td></tr></tbody></table></td></tr></tbody></table></td></tr></tb=
ody></table></div></blockquote></div></div></body></html>=

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From nobody Mon Sep 17 02:13:30 2018
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From: Carsten Bormann <cabo@tzi.org>
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Subject: Re: [core] Upcoming virtual interim meetings (Re: CoRE@IETF102: Summary)
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For the next two interims, we have the following agenda items right now:

2018-09-26 (Jaime is chairing)

=E2=80=94 draft-ietf-core-pubsub; compare with =
https://tools.ietf.org/html/draft-hartke-t2trg-data-hub-01, as well as =
https://tools.ietf.org/html/draft-bormann-t2trg-stp-01 (for queueing =
messages)

Objective: bring pubsub forward towards readiness for WGLC

2018-10-10 (both chairs present)

- Objectives: readying drafts for pre-Bangkok WGLCs, specifically:

   =E2=80=94 echo/request-tag =E2=80=94 discuss the reviews (we hope to =
have by then)
   =E2=80=94 multipart-ct: ready to go?
   - stateless

=E2=80=94 check CORECONF status, Objective: ready remaining documents =
for WGLC

- RD interop report (if it already happened) or announcement (if it =
didn=E2=80=99t)

Please send in additional topics (remember that we have only one hour =
per call, though).

If you do want to lead a slot, please holler now and send in slides by =
Monday before the meeting.

Gr=C3=BC=C3=9Fe, Carsten


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While there have not been many postings to the list supporting this, at =
the interims we also had good oral support, and there was no negative =
feedback.  So we have consensus to adopt.

Authors: please re-submit as draft-ietf-core-hop-limit-00.

Gr=C3=BC=C3=9Fe, Carsten


> On 10. Sep 2018, at 21:54, carsten bormann <cabo@tzi.org> wrote:
>=20
> It seems we have converged at draft-boucadair-core-hop-limit as the =
draft providing the hop limit function needed by DOTS, but we haven=E2=80=99=
t done the formal WG adoption yet.
>=20
> This is a formal call for adoption of this draft as a WG document of =
the CoRE WG.
> If you have read the draft and support adopting it, please say so.
> If you see a problem with adopting it as a WG document, please tell =
us.
> For both, remember that WG adoption does not mean that we already have =
consensus on all the details, just that this is the right working =
document to address the issue (and that we should address the issue in =
the first place).
> Please do mention any issues that you already know; these also can be =
brought up in Wednesday=E2=80=99s virtual interim Webex call.
>=20
> This formal WG adoption call runs until the end of September 17th.
> (Given the state of the discussion, we might then have a Working Group =
last call of an updated document right next.)
>=20
> Gr=C3=BC=C3=9Fe, Carsten
>=20
> _______________________________________________
> core mailing list
> core@ietf.org
> https://www.ietf.org/mailman/listinfo/core
>=20
>=20


From nobody Mon Sep 17 23:44:32 2018
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Subject: [core] I-D Action: draft-ietf-core-hop-limit-00.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Constrained RESTful Environments WG of the IETF.

        Title           : Constrained Application Protocol (CoAP) Hop Limit Option
        Authors         : Mohamed Boucadair
                          Tirumaleswar Reddy
                          Jon Shallow
	Filename        : draft-ietf-core-hop-limit-00.txt
	Pages           : 6
	Date            : 2018-09-17

Abstract:
   The presence of Constrained Application Protocol (CoAP) proxies may
   lead to infinite forwarding loops, which is undesirable.  To prevent
   and detect such loops, this document specifies the Hop-Limit CoAP
   option.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-core-hop-limit/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-core-hop-limit-00
https://datatracker.ietf.org/doc/html/draft-ietf-core-hop-limit-00


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: Klaus Hartke <klaus.hartke@ericsson.com>
To: Jim Schaad <ietf@augustcellars.com>, "draft-hartke-core-stateless@ietf.org" <draft-hartke-core-stateless@ietf.org>
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Hi authors,

Thanks for this useful document. 

I have no comments on sections 3 and 4 that read rather easily. 

Some comments on the other sections follow below: 

Section 1.1 

Introduce group request (GR)-message and response message in relation to
GR-client and GR-server to clarify text in section 2. To be used
consistently throughout the text. 

End page 3. The phrase on the use of DTLS seems a bit far-fetched; Do
you mean that multiple DTLS sessions are started for each group request
sent by a client? 

Group ID: s/a same Group Manager/a given Group Manager/ 

End section 1.1; remove: "by a different group member or by a
non-group-member" This only excludes itself. 

Section 2 

Where does the endpoint store all these contexts? I assume local storage
is used. 

Text substitution suggestions: 

s/Each endpoint in the group stores:/Each endpoint in a group makes use
of:/ 

s/endpoints in the group/endpoints in a given group/ 

s/The ID Context parameter stores the group ID/The ID Context parameter
contains the group ID/ 

The Sender context description is confusing. I understood that both a
client when sending a group request, and a receiver when sending a
response message use the sender context for sending the message. The
text seems to suggest that only a group request need a sender context
and not the response message. 

If the Sender context applies only to group request messages, the term
request context is more appropriate and distinguishes from the sender
context in OSCORE 

Same confusion about the recipient context; the text seems to exclude
that a group request client also needs a recipient context. 

Table 1:  why "each" Recipient context and not "each" sender context? 

Public key of the associated other endpoint: is this the group request
client endpoint or any endpoint sending to this recipient? 

Section 2.1:  should the section not refer to oscoap-joining draft in
ACE? 

Section 3 'kid' parameter value; Does this only apply to response
messages sent by group request servers? 

Section 5; I don't think that I understand the problem. One of the
conditions is that a client which is not part of a group cannot decrypt
the group messages, and a client that has left the group cannot decrypt
the group messages either. That constitutes already a pretty firm
synchronization. My assumption was that this would be effectuated by
distributing new master secret every time the group changes. In Appendix
C, you suggest the epoch in the GID (Chaging the epoch, the GID may
remain constant over group changes). My recommendation is to make the
epoch compulsory for synchronization purposes. 

During membership of a group, a GR-client can consecutively number its
messages starting at zero every time a new epoch is started (with a new
master secret as specified in section 2.1). See also remark on A.2. 

Section 6, 

what is the relation of section 6 with with oscoap-joining. Is
oscoap-joining required to validate all the requirements of section 6? 

Methods to handle loss of synchronization are not responsibility of GM
but responsibility of the sender of group request messages. No total
ordering on all messages is required, only partial ordering on the
messages of a given sender. I assume that the ordering of epochs is done
by GM. 

Trusted key repository: Also when the group manager makes use of an
additional secure storage device, it remains responsible for the key
repository. 

Acting as a network router is out of scope IMO. RFCs exist to create and
route group messages and it is immaterial which devices host the routing
agents. This is also a subject of appendix D; same remark applies there
as well. 

Autonomously and locally enforcing… ; what is the difference with bullet
2  of section 6? 

7.1 I don't understand the remark that all group members are trusted.
What does that mean? IMU, They have been authorized to join a group and
are trusted per definition. 

7.2 Case A and Case B refer to cases in OSCORE draft? 

7.3 Does it not need an explanation how one sender belonging to two
groups with the same GID can be distinguished by a receiver that is
member of these two groups as well? The text at the end of appendix C is
not very convincing. 

A.1 bullet 2; remove: "e.g. by grouping lights….."  (it is unknown how
large groups in one room can be, leave alone a floor) 

A.1 Establishments an management of security contexts: I hope that a
general key management scheme is not necessary to provide the GM with a
protocol to distribute new master secrets for the next group epoch. 

A.2 

Source Authentication, s/ensure/verify/ 

Message Integrity, s/ensure/verify/ 

Message ordering: Messages should be given a sequence number by the
sender, a new coap option could be defined. Total ordering of the
messages in a Group is not required. 

Appendix C: Could this text (or a variant) not become normative text to
provide simple source ordering. 

Appendix D: first three paragraphs double with Appendix A, just
differently formulated. Suggest to remove or better review separation
with appendix A. 

See router comment of section 6. 

Appendix D.1 is very informative but provides many choices. Oscoap join
should specify the choices. According to me much of the text of Appendix
D.1 should go to oscoap-join to motivate the choices made for oscoap
join. 

Appendix D.2. My suggestion is to make the GM the key repository, or
connect a key repository to it, that needs to be accessed through the
GM. 

Appendix D3. Should this not be normative text in oscoap-join? 

Appendix E. A relation between message freshness and message ordering is
suggested that I do not understand. When a sender sends only one message
ever, the ordering is assured, but freshness is not guaranteed on
reception. 

Suppose only ordering is guaranteed with sequence numbers in the
message; Losing messages can be detected. A procedure to receive lost
messages is indeed necessary. But this involves storage of messages at
the sender (how many?), and possibly re-encrypting to guarantee
freshness when they are repeated on loss detection. Hope this helps.

Greetings,

peter 
-- 
Peter van der Stok
vanderstok consultancy
mailto: consultancy@vanderstok.org, stokcons@bbhmail.nl
www: www.vanderstok.org [1]
tel NL: +31(0)492474673     F: +33(0)966015248 
_______________________________________________
Ace mailing list
Ace@ietf.org
https://www.ietf.org/mailman/listinfo/ace 

Links:
------
[1] http://www.vanderstok.org
--=_b147bef7e70fe55fb338ddf2290987b7
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=UTF-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3DUTF-8" /></head><body style=3D'font-size: 10pt; font-family: Verdana,Gen=
eva,sans-serif'>
<br /><!-- html ignored --><!-- head ignored --><!-- meta ignored -->Hi aut=
hors,<br /><br />
<p>Thanks for this useful document.</p>
<p>I have no comments on sections 3 and 4 that read rather easily.</p>
<p>Some comments on the other sections follow below:</p>
<p>Section 1.1</p>
<p>Introduce group request (GR)-message and response message in relation to=
 GR-client and GR-server to clarify text in section 2. To be used consisten=
tly throughout the text.</p>
<p>End page 3. The phrase on the use of DTLS seems a bit far-fetched; Do yo=
u mean that multiple DTLS sessions are started for each group request sent =
by a client?</p>
<p>Group ID: s/a same Group Manager/a given Group Manager/</p>
<p>End section 1.1; remove: &ldquo;by a different group member or by a non-=
group-member&rdquo; This only excludes itself.</p>
<p>Section 2</p>
<p>Where does the endpoint store all these contexts? I assume local storage=
 is used.</p>
<p>Text substitution suggestions:</p>
<p>s/Each endpoint in the group stores:/Each endpoint in a group makes use =
of:/</p>
<p>s/endpoints in the group/endpoints in a given group/</p>
<p>s/The ID Context parameter stores the group ID/The ID Context parameter =
contains the group ID/</p>
<p>The Sender context description is confusing. I understood that both a cl=
ient when sending a group request, and a receiver when sending a response m=
essage use the sender context for sending the message. The text seems to su=
ggest that only a group request need a sender context and not the response =
message.</p>
<p>If the Sender context applies only to group request messages, the term r=
equest context is more appropriate and distinguishes from the sender contex=
t in OSCORE</p>
<p>Same confusion about the recipient context; the text seems to exclude th=
at a group request client also needs a recipient context.</p>
<p>Table 1:&nbsp; why &ldquo;each&rdquo; Recipient context and not &ldquo;e=
ach&rdquo; sender context?</p>
<p>Public key of the associated other endpoint: is this the group request c=
lient endpoint or any endpoint sending to this recipient?</p>
<p>Section 2.1:&nbsp; should the section not refer to oscoap-joining draft =
in ACE?</p>
<p>Section 3 &lsquo;kid&rsquo; parameter value; Does this only apply to res=
ponse messages sent by group request servers?</p>
<p>Section 5; I don&rsquo;t think that I understand the problem. One of the=
 conditions is that a client which is not part of a group cannot decrypt th=
e group messages, and a client that has left the group cannot decrypt the g=
roup messages either. That constitutes already a pretty firm synchronizatio=
n. My assumption was that this would be effectuated by distributing new mas=
ter secret every time the group changes. In Appendix C, you suggest the epo=
ch in the GID (Chaging the epoch, the GID may remain constant over group ch=
anges). My recommendation is to make the epoch compulsory for synchronizati=
on purposes.</p>
<p>During membership of a group, a GR-client can consecutively number its m=
essages starting at zero every time a new epoch is started (with a new mast=
er secret as specified in section 2.1). See also remark on A.2.</p>
<p>Section 6,</p>
<p>what is the relation of section 6 with with oscoap-joining. Is oscoap-jo=
ining required to validate all the requirements of section 6?</p>
<p>Methods to handle loss of synchronization are not responsibility of GM b=
ut responsibility of the sender of group request messages. No total orderin=
g on all messages is required, only partial ordering on the messages of a g=
iven sender. I assume that the ordering of epochs is done by GM.</p>
<p>Trusted key repository: Also when the group manager makes use of an addi=
tional secure storage device, it remains responsible for the key repository=
=2E</p>
<p>Acting as a network router is out of scope IMO. RFCs exist to create and=
 route group messages and it is immaterial which devices host the routing a=
gents. This is also a subject of appendix D; same remark applies there as w=
ell.</p>
<p>Autonomously and locally enforcing&hellip; ; what is the difference with=
 bullet 2&nbsp; of section 6?</p>
<p>7.1 I don&rsquo;t understand the remark that all group members are trust=
ed. What does that mean? IMU, They have been authorized to join a group and=
 are trusted per definition.</p>
<p>7.2 Case A and Case B refer to cases in OSCORE draft?</p>
<p>7.3 Does it not need an explanation how one sender belonging to two grou=
ps with the same GID can be distinguished by a receiver that is member of t=
hese two groups as well? The text at the end of appendix C is not very conv=
incing.</p>
<p>A.1 bullet 2; remove: &ldquo;e.g. by grouping lights&hellip;..&rdquo;&nb=
sp; (it is unknown how large groups in one room can be, leave alone a floor=
)</p>
<p>A.1 Establishments an management of security contexts: I hope that a gen=
eral key management scheme is not necessary to provide the GM with a protoc=
ol to distribute new master secrets for the next group epoch.</p>
<p>A.2</p>
<p>Source Authentication, s/ensure/verify/</p>
<p>Message Integrity, s/ensure/verify/</p>
<p>Message ordering: Messages should be given a sequence number by the send=
er, a new coap option could be defined. Total ordering of the messages in a=
 Group is not required.</p>
<p><br /></p>
<p>Appendix C: Could this text (or a variant) not become normative text to =
provide simple source ordering.</p>
<p>Appendix D: first three paragraphs double with Appendix A, just differen=
tly formulated. Suggest to remove or better review separation with appendix=
 A.</p>
<p>See router comment of section 6.</p>
<p>Appendix D.1 is very informative but provides many choices. Oscoap join =
should specify the choices. According to me much of the text of Appendix D=
=2E1 should go to oscoap-join to motivate the choices made for oscoap join=
=2E</p>
<p>Appendix D.2. My suggestion is to make the GM the key repository, or con=
nect a key repository to it, that needs to be accessed through the GM.</p>
<p>Appendix D3. Should this not be normative text in oscoap-join?</p>
<p>Appendix E. A relation between message freshness and message ordering is=
 suggested that I do not understand. When a sender sends only one message e=
ver, the ordering is assured, but freshness is not guaranteed on reception=
=2E</p>
<p>Suppose only ordering is guaranteed with sequence numbers in the message=
; Losing messages can be detected. A procedure to receive lost messages is =
indeed necessary. But this involves storage of messages at the sender (how =
many?), and possibly re-encrypting to guarantee freshness when they are rep=
eated on loss detection.</p>
Hope this helps.<br /><br />Greetings,<br /><br />peter
<div>-- <br />
<div class=3D"pre" style=3D"margin: 0; padding: 0; font-family: monospace;"=
>Peter van der Stok<br /> vanderstok consultancy<br /> mailto: <a href=3D"m=
ailto:consultancy@vanderstok.org" rel=3D"noreferrer">consultancy@vanderstok=
=2Eorg</a>, <a href=3D"mailto:stokcons@bbhmail.nl" rel=3D"noreferrer">stokc=
ons@bbhmail.nl</a><br /> www: <a href=3D"http://www.vanderstok.org" target=
=3D"_blank" rel=3D"noreferrer">www.vanderstok.org</a><br /> tel NL: +31(0)4=
92474673 &nbsp;&nbsp;&nbsp;&nbsp;F: +33(0)966015248</div>
</div>
<!-- html ignored --><br />
<div class=3D"pre" style=3D"margin: 0; padding: 0; font-family: monospace">=
_______________________________________________<br /> Ace mailing list<br /=
><a href=3D"mailto:Ace@ietf.org" rel=3D"noreferrer">Ace@ietf.org</a><br /><=
a href=3D"https://www.ietf.org/mailman/listinfo/ace" target=3D"_blank" rel=
=3D"noreferrer">https://www.ietf.org/mailman/listinfo/ace</a></div>
</body></html>

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From nobody Thu Sep 20 10:56:22 2018
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From: Ken Bannister <kb2ma@runbox.com>
To: CORE <core@ietf.org>
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Date: Thu, 20 Sep 2018 17:55:41 +0000
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Subject: [core] RFC 8323 constrained implementation
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Is anyone aware of an embedded C (no malloc) implementation of CoAP over 
TCP (RFC 8323)?

Thanks,
Ken


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Subject: [core] Dynlink observation attributes
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Hello Michael,

as suggested in today's interim meeting, I'd like to get the discussion
on observation attributes going again.

To me, the takewaway point of today was that there can be various ways
of expressing the observation attributes; that we're happy with what the
attributes can do and their semantics, but that the current way of
persistently PUT parameters on a link is not ideal for the general use
case.

I've left the bulk of my original mail below because I still think it
gets across the message (though some may be preaching to the choir given
the above), and stripped unrelated points into a separate thread:

> Observation attributes
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> I'd like to refer back to one of my earlierst mails on this mailing
> list at [CA2013]. The answer to "why not just observe
> </temp?pmin=3D10&pmax=3D60&st=3D1> as it was in earlier drafts" about cac=
hing
> was not really satisfying, given that this scheme breaks caching just as
> the original but just worse (previously, a cache would just not have a
> response ready; now, it sees an observation and thinks the value is
> current where it's actually from an observation to a client that's not
> interested in details).
>=20
> The way of PUTting empty values onto query-parameter identified
> resources is incompatible with multiple observations.
>=20
> Moreover, its use is unclear to me from reading it. The sentence "These
> query parameters MUST be treated as resources that are read using GET
> and updated using PUT" seems to indicate that they are used like this:
>=20
> | GET /temp?pmin
> | 2.05 Content
> | Payload: "0"
>=20
> (or however undefined is expressed there)
>=20
> | PUT /temp?pmin
> | Payload: "10"
> | 2.04 Changed
>=20
> But "Multiple parameters MAY be updated at the same time by including
> the values in the query string of a PUT" makes it sound like it should
> be
>=20
> | PUT /temp?pmin=3D10&pmax=3D20
> | empty payload
> | 2.04 Changed
>=20
> -- are both permissible? And if only the latter: How is this accessed
> with GET? Examples might help, but explicit words would be good too.
>=20
> Another open question is how to turn those limits off again. Would I
> just DELETE the <?pmin> resources?=20
>=20
> This was all a whole lot clearer when one could observer
>=20
> | GET /temp?pmin=3D10&pmax=3D20
>=20
> and have those limits per observation without any new state introduced
> to the server -- a behavior I would still prefer to see there.
>=20
> [CA2013]: http://ietf.org/mail-archive/web/core/current/msg04270.html
>=20
> Observation attributes in bindings
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> There are two components in this document I percieve as relatively
> separate -- the link bindings, and the limiting attributes.
>=20
> Link bindings work well on their own.
>=20
> With in-query observation attributes, there would not be any need to
> define the attributes additionally as link attributes (where, judging
> from RD discussions, it can be confusing to have both).
>=20
> Especially troublesome about the attributes is that they are not target
> attributes, but link attributes. (All other common attributes in
> link-format documents are target attributes, with the exception of
> anchor=3D and rel=3D/rev=3D which are core to the web linking model). That
> means that using other web link formats (eg. CoRAL, RDF; don't know
> about HSML) will have a hard time expressing those. I think that
> non-target link attributes should be limited to data that is meaningful
> on the web linking level and not for arbitrary attributes.

One closing throught: In implementations, we're often thinking of
everything that has the same path as the same resource, and query
parameters just giving details on it. CoAP's REST model does not know
this distinction -- /temp is something different than /temp?pmin=3D10, and
only because we said </temp>;if=3D"core.s" we can conclude that it's
related to the /temp?pmin=3D10 resource.

Let us stick with this, and call /temp?pmin=3D10 a view on /temp, like
through a lens that blurs an image.

Best regards
Christian

--=20
This may seem a bit weird, but that's okay, because it is weird.
  -- perldata(1) about perl variables

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From: Christian =?iso-8859-1?Q?Ams=FCss?= <christian@amsuess.com>
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Subject: [core] (rest of) Re:  Review of dynlink
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To better keep track of the discussion, here's the portions of my
original review that are not taken to the new thread at [1]; unquoted
for readability:

----

Hello dynlink authors,

These are notes from reviewing the dynlink draft; sorry for not
assembling those earlier, I hope they are still appreciated.

The document I'm reading is is post-06 git version dc0bbaff1.

Mandatory and exhaustive bind attribute
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

I think that there are several bind methods missing:

* "Observe+Push". The device executing this binding has neither source
  nor destination resource locally, but will observe (or for a
  "Poll+Push", poll) the source and PUT to the destination.

  This is useful when two devices are to be connected, neither of which
  has a binding site, but a device between them (eg. a border proxy or
  home access point) does.

* "Native". Used for resources on the same server. Neither, or both, of
  observation and pushing are applicable here, but it's really up to the
  server whether it establishes either, short-circuits the resources in
  software or (in case of a gateway I worked on last year) configures
  the bus represented by the resources to link those.

* Possibly "On-Demand" (not fully thought-through). When the destination
  resource is queried, the binding site issues a request to the source
  resource (or uses a fresh cached state maybe) and only responds when
  that arrives, or establishes an observation when the destination is
  observed. (Note that an actuator resource behaves like the hardware
  has an observation on the resource, but that's not the case for all
  resources, and the client might even allow creation of destination
  resources).

In general, I don't think that a bind=3D attribute should be mandated. A
binding site with the source local and the destination remote will know
to PUT the data, and a site with the source remote will GET+Observe
anyway if it can, and fall back to polling if the observation is
declined.

It's useful to have the methods named and discussed, but I doubt the
need for them to be present in the actual transmitted data (especially
as link attributes, see observation attributes) -- and what would happen
to a `POST /bnd: <coap://example.com/s>;anchor=3D"/a";bind=3D"push"`? Is
that 4.00? That brings us to...

Error behavior of binding tables
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D

How would a binding site react to

* unknown/-implemented schemes?
* permanent or intermittent network unreachability?
* all kind of error codes, especially 4.01/.03?

I don't expect a full treatise of the ways a binding can go wrong in the
document, but at least the issue of creating a traffic storm in response
to an error, whether an error can make a binding just disappear, and
whether the binding site can indicate any error state of a binding
should be covered IMO.

Assorted
=3D=3D=3D=3D=3D=3D=3D=3D

* boundTo is capitalized differently.

* "The binding conditions are mapped as query string parameters (see
  Section 4)."
 =20
  Ie. by the time the binding is established, the binding site PUTs the
  parameters the destination resource? Would it need to do that whenever
  the observation is set up, or only once? (That's probably a point that
  could go to to the first section too: there's no text about
  persistence of that state. Is it soft state? How does the client
  know?)

* "A resource using an interface description defined in this
  specification and marked as Observable in its link description SHOULD
  support these observation parameters."

  The only interface description defined in this specification is
  core.bnd, and while it does make sense to observe a binding site for
  monitoring purposes, most of the observation attributes are
  nonsentical on a non-numerical resource. Could this be a leftover from
  when this was a single document with core-interfaces?

* links-json will hopefully pass some time soon. Can those formats be
  used with dynlinks (subject to advertisement in ct=3D and content format
  negotiation, of course)?

Summary
=3D=3D=3D=3D=3D=3D=3D

Many of the issues described with links were not present in the pre-2013
way of passing observation parameters as query parameters to that
observation; I recommend that that way be re-evaluated.

I see much value in having the both bindings and observation thresholds,
and the semantics of the threshold parameters (band etc) seem to be
mature by now, but I would ask for in-depth discussion of the above
points.

Best regards
Christian


[1]: https://mailarchive.ietf.org/arch/msg/core/jA_zWgxgd01fvwiTIgAyZTTb5HY

--=20
This may seem a bit weird, but that's okay, because it is weird.
  -- perldata(1) about perl variables

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From: Christian =?iso-8859-1?Q?Ams=FCss?= <christian@amsuess.com>
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Subject: [core] Short review of SenML fetch/patch
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Hello authors,

as requested during yesterday's interim meeting, I've had a look at
senml-fetch again:

Fetch
=3D=3D=3D=3D=3D

Fetching by time
----------------

Being able to pick aparticular timestamp is an oddly specific
application; my impression of general SenML data sets is that it will be
hard to predict which point in time should have a datum if that record
is not already known. Unless there are good (and argued for) use cases,
I suggest that the topic of fetching time series points be explored
comprehensively in a separate document, possibly hooking into
draft-bormann-t2trg-stp.


Using SenML to fetch
--------------------

SenML requires to have a value (or sum) on every record, the payload of
the fetch request therefore can't use any of the defined SenML mime
types but would need to specify their own. I'm unsure on whether adding
a field like "fetch_":1 to the first record (a mandatory-to-decode
custom field) would be sufficient to work around that constraint.

Otherwise, it might be an option to update RFC8428 to say that some of
those limitations (also the later "v":null) may be overridden in
applications like this where it is made sure (eg. by never using those
freedoms in Content or PUT payloads) that no generic SenML processor
ever gets its hands on the document.

The payload sent in as a FETCH payload is not actually sensor data, it's
a list of names (or, provided they're viewed as URIs, which I recommend)
links. We already have a way to transmit a list of links in CoRE
(actually 3 with links-json). I don't object to introducing another
(given the above, might be called application/links+senml+{cbor,json}?)
especially to reduce parsing complexity, but do suggest that FETCHing
SenML data be done with a list of identifiers no matter how they are
transported, and the recommended way can well be a SenML-names-only
payload (but would not preclude others).


Patch
=3D=3D=3D=3D=3D

"value field with value null": There has been some backpressure against
having variable-type fields in SenML back when its JSON/CBOR structure
was last changed; having a "v":null in there could be problematic (esp.
as its JSON type is fixed to Number in Table 2 of RFC8428). I suggest
having a explicit "delete value" field, eg. "vdel":true.


How would base values work with patch? I figure that it's always the
resolved record that matter, but that should be explicit. In connection
with a "vdel" (or "v":null if it turns out it's OK for it to stay like
that), it might make sense to allow that too (where a "v":n would
override "vdel" or "v":null from an offset of zero) to allow for
efficient batch removal of values.


Security considerations
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

"potentially allow retrieving or changing many resources at once" makes
it sound like FETCH and PATCH could reach out to different resources.
They don't (conceptually), they only manipulate what's inside the target
resource (which typically is an aggregation of other resources, as in a
core-interfaces batch). Suggested replacement:

   In FETCH and iPATCH requests, the client can pass arbitrary names to
   the target resource for manipulation. The resource implementer must
   take care to only allow access to names that are actually part of (or
   accessible through) the target resource.
  =20
   If the client is not allowed to do a GET or PUT on the full target
   resource (and thus all the names accessible through it), access
   control rules must be evaluated for each record in the pack.

(It's fine if someone goes ahead and defines a /senml resource on their
device that is a gate to "everything and anything that can be addressed
in SenML", but that shouldn't be the default assumption).


Best regards
Christian

--=20
You don't become great by trying to be great. You become great by
wanting to do something, and then doing it so hard that you become great
in the process.
  -- Marie Curie (as quoted by Randall Munroe)

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Date: Thu, 27 Sep 2018 12:43:39 +0200
From: Christian =?iso-8859-1?Q?Ams=FCss?= <christian@amsuess.com>
To: core@ietf.org
Message-ID: <20180927104338.GB5321@hephaistos.amsuess.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/core/ZNv9ugJ1I0zgYlV_K1-oOUJ0Ys8>
Subject: [core] pre-draft: Dereference Link type ("redirection")
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Hello CoRE,

there have been some occasions on which redirection hase come up
invarious forms. A corner use case for that popped up again when
reviewing the senml-fetch draft.

I don't plan on pushing this, as I personally have no use cases for it,
but I'd rather have some place where to spool any demand for redirection
and other forms of indirection, so that if and when there comes actual
demand, there's something to start with.

An initial pre-draft is attached ("pre-draft" because its style is
probably too tongue-in-cheek for a draft upload), comments are welcome.

Best regards
Christian

--=20
Most people would leave. Not us. We're Vikings. We have stubbornness issues.
  -- Hiccup, son of Stoic

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  /*]]>*/</style>
  <meta name=3D"viewport" content=3D"initial-scale=3D1.0">


  <link href=3D"#rfc.toc" rel=3D"Contents">
<link href=3D"#rfc.section.1" rel=3D"Chapter" title=3D"1 Introduction">
<link href=3D"#rfc.section.2" rel=3D"Chapter" title=3D"2 The Dereference Li=
nk type">
<link href=3D"#rfc.section.2.1" rel=3D"Chapter" title=3D"2.1 Comparison to =
media-type specific inclusion">
<link href=3D"#rfc.section.3" rel=3D"Chapter" title=3D"3 Use cases">
<link href=3D"#rfc.section.3.1" rel=3D"Chapter" title=3D"3.1 Redirection">
<link href=3D"#rfc.section.3.2" rel=3D"Chapter" title=3D"3.2 Firmware uploa=
ds">
<link href=3D"#rfc.section.3.3" rel=3D"Chapter" title=3D"3.3 Parametrized S=
enML FETCH">
<link href=3D"#rfc.section.4" rel=3D"Chapter" title=3D"4 Security considera=
tions">
<link href=3D"#rfc.references" rel=3D"Chapter" title=3D"5 References">
<link href=3D"#rfc.references.1" rel=3D"Chapter" title=3D"5.1 Normative Ref=
erences">
<link href=3D"#rfc.references.2" rel=3D"Chapter" title=3D"5.2 Informative R=
eferences">
<link href=3D"#rfc.appendix.A" rel=3D"Chapter" title=3D"A Examples">
<link href=3D"#rfc.authors" rel=3D"Chapter">


  <meta name=3D"generator" content=3D"xml2rfc version 2.9.8 - https://tools=
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  <link rel=3D"schema.dct" href=3D"http://purl.org/dc/terms/" />

  <meta name=3D"dct.creator" content=3D"Ams&#252;ss, C." />
  <meta name=3D"dct.identifier" content=3D"urn:ietf:id:draft-amsuess-core-d=
ereference-type-latest" />
  <meta name=3D"dct.issued" scheme=3D"ISO8601" content=3D"2018-09-27" />
  <meta name=3D"dct.abstract" content=3D"[ See introduction ]" />
  <meta name=3D"description" content=3D"[ See introduction ]" />

</head>

<body>

  <table class=3D"header">
    <tbody>
   =20
    	<tr>
<td class=3D"left">CoRE</td>
<td class=3D"right">C. Ams&#252;ss</td>
</tr>
<tr>
<td class=3D"left">Internet-Draft</td>
<td class=3D"right">September 27, 2018</td>
</tr>
<tr>
<td class=3D"left">Expires: March 31, 2019</td>
<td class=3D"right"></td>
</tr>

    =09
    </tbody>
  </table>

  <p class=3D"title">Expressing indirection in a dereferencing content type=
<br />
  <span class=3D"filename">draft-amsuess-core-dereference-type-latest</span=
></p>
 =20
  <h1 id=3D"rfc.abstract"><a href=3D"#rfc.abstract">Abstract</a></h1>
<p>[ See introduction ]</p>
<h1 id=3D"rfc.status"><a href=3D"#rfc.status">Status of This Memo</a></h1>
<p>This Internet-Draft is submitted in full conformance with the provisions=
 of BCP 78 and BCP 79.</p>
<p>Internet-Drafts are working documents of the Internet Engineering Task F=
orce (IETF).  Note that other groups may also distribute working documents =
as Internet-Drafts.  The list of current Internet-Drafts is at https://data=
tracker.ietf.org/drafts/current/.</p>
<p>Internet-Drafts are draft documents valid for a maximum of six months an=
d may be updated, replaced, or obsoleted by other documents at any time.  I=
t is inappropriate to use Internet-Drafts as reference material or to cite =
them other than as "work in progress."</p>
<p>This Internet-Draft will expire on March 31, 2019.</p>
<h1 id=3D"rfc.copyrightnotice"><a href=3D"#rfc.copyrightnotice">Copyright N=
otice</a></h1>
<p>Copyright (c) 2018 IETF Trust and the persons identified as the document=
 authors.  All rights reserved.</p>
<p>This document is subject to BCP 78 and the IETF Trust's Legal Provisions=
 Relating to IETF Documents (https://trustee.ietf.org/license-info) in effe=
ct on the date of publication of this document.  Please review these docume=
nts carefully, as they describe your rights and restrictions with respect t=
o this document.  Code Components extracted from this document must include=
 Simplified BSD License text as described in Section 4.e of the Trust Legal=
 Provisions and are provided without warranty as described in the Simplifie=
d BSD License.</p>
<h1 id=3D"rfc.section.1">
<a href=3D"#rfc.section.1">1.</a> <a href=3D"#introduction" id=3D"introduct=
ion">Introduction</a>
</h1>
<p id=3D"rfc.section.1.p.1">The topic of providing a content format that in=
dicates that a particular URI should be dereferenced instead of using the p=
ayload itself has come up time and again in CoRE [citation needed].</p>
<p id=3D"rfc.section.1.p.2">Nobody has done anything about it. [TDB: Check =
whether that&#8217;s actually the case.]</p>
<p id=3D"rfc.section.1.p.3">Until now.</p>
<h1 id=3D"rfc.section.2">
<a href=3D"#rfc.section.2">2.</a> <a href=3D"#the-dereference-link-type" id=
=3D"the-dereference-link-type">The Dereference Link type</a>
</h1>
<p id=3D"rfc.section.2.p.1">The Dereference Link type is a media type for u=
se with RESTful systems that carries a very particular piece of information=
: That a representation of the requested resource is available at a given l=
ocation.</p>
<p id=3D"rfc.section.2.p.2">The location of that representation is expresse=
d in an <a href=3D"#RFC6690" class=3D"xref">[RFC6690]</a> link format docum=
ent that contains only a single link whose target is expressed as a URI (ie=
=2E not a relative reference).  The link MAY contain target attributes, whi=
ch the client MAY ignore.</p>
<p id=3D"rfc.section.2.p.3">[ TBD: Detailed deliberations on whether to use=
 link-format, just a plain URI, links-json or what so not &#8211; and wheth=
er a relative refrence can make sense. ]</p>
<p id=3D"rfc.section.2.p.4">A Dereference Link always indicates semantic eq=
uivalence: It indicates that any information derived from its link target c=
ould also have been obtained from the requested resource.  It does not mean=
 that any resource representation obtained of the target resource could be =
literally substituted for it.</p>
<p id=3D"rfc.section.2.p.5">This specification does not prescribe any behav=
ior to recipients of a Dereference Link, it is up to application descriptio=
ns to explore its security implications and to describe what a recipient ma=
y or may not do about it.</p>
<h1 id=3D"rfc.section.2.1">
<a href=3D"#rfc.section.2.1">2.1.</a> <a href=3D"#comparison-to-media-type-=
specific-inclusion" id=3D"comparison-to-media-type-specific-inclusion">Comp=
arison to media-type specific inclusion</a>
</h1>
<p id=3D"rfc.section.2.1.p.1">Various media types contain built-in faciliti=
es to express the same intent as a Derefere Link:</p>
<p id=3D"rfc.section.2.1.p.2">A HTML document can contain an <samp>&lt;ifra=
me&gt;</samp> tag that is displayed full-screen.</p>
<p id=3D"rfc.section.2.1.p.3">An SVG document can use the <samp>&lt;image&g=
t;</samp> tag to include another SVG file at the current location.</p>
<p id=3D"rfc.section.2.1.p.4">The C preprocessor directive <samp>#include</=
samp> allows sourcing in code from a different file.  This is limited to lo=
cal file systems, but preserves the semantics of the included file: If the =
included file contains an <samp>#include</samp> itself, its argument is int=
erpreted relative to the included file&#8217;s location.</p>
<p id=3D"rfc.section.2.1.p.5">LaTeX&#8217;s <samp>\input</samp> command doe=
s something differetn than the Dereference Link type: it includes a literal=
 copy of the target file in the outer file&#8217;s source code, and any rel=
ative references in there are interpreted relative to the outer document.</=
p>
<h1 id=3D"rfc.section.3">
<a href=3D"#rfc.section.3">3.</a> <a href=3D"#use-cases" id=3D"use-cases">U=
se cases</a>
</h1>
<h1 id=3D"rfc.section.3.1">
<a href=3D"#rfc.section.3.1">3.1.</a> <a href=3D"#redirection" id=3D"redire=
ction">Redirection</a>
</h1>
<p id=3D"rfc.section.3.1.p.1">People requested that CoAP have redirection &=
#8211; be served:</p>
<pre>
GET coap://example.com/weather

2.05 Content
Content-Format: application/dereference+link-format
Payload:
  &lt;coap://example.net/weather-in-vienna&gt;

GET coap://example.net/weather-in-vienna

2.05 Content
Content-Format: application/senml+json
Payload:
  [{"n": "urn:example:weather:VIE:temperature", "v": 16.5, "u": "Cel"}]
</pre>
<p id=3D"rfc.section.3.1.p.2">Also works for POST operations:</p>
<pre>
POST coap://node.example.com/create-long-report

2.05 Content (sent immediately)
Content-Format: application/dereference+link-format
Payload:
  &lt;coap://node.example.com/report-spool/123&gt;

GET coap://node.example.com/report-spool/123

5.03 I'm Still Busy With That

=2E..

GET coap://node.example.com/report-spool/123

2.05 Here You Go
=2E..
</pre>
<h1 id=3D"rfc.section.3.2">
<a href=3D"#rfc.section.3.2">3.2.</a> <a href=3D"#firmware-uploads" id=3D"f=
irmware-uploads">Firmware uploads</a>
</h1>
<p id=3D"rfc.section.3.2.p.1">Pushing a firmware upload using a close data =
source:</p>
<pre>
PUT coap://node1.example.com/firmware
Content-Format: application/dereference+link-format
Payload:
  &lt;coap://gateway.example.com/files/fw01234.bin&gt;

(Server goes there and fetches its firmware update)

2.04 Changed
</pre>
<p id=3D"rfc.section.3.2.p.2">Note that different application specification=
s might disagree on whether the server returns success immediately or wheth=
er it needs to obtain a full copy before doing so.</p>
<h1 id=3D"rfc.section.3.3">
<a href=3D"#rfc.section.3.3">3.3.</a> <a href=3D"#parametrized-senml-fetch"=
 id=3D"parametrized-senml-fetch">Parametrized SenML FETCH</a>
</h1>
<p id=3D"rfc.section.3.3.p.1">A batch of SenML values can be accessed with =
a FETCH operation according to <a href=3D"#I-D.keranen-core-senml-fetch" cl=
ass=3D"xref">[I-D.keranen-core-senml-fetch]</a> by sending a list of names =
to the batch and receiving a subset of its data.</p>
<p id=3D"rfc.section.3.3.p.2">If one agrees that a list of names and a list=
 of resource links are interchangable, a server might support more elaborat=
e queries using a filter language it has already built in:</p>
<pre>
FETCH coap://node1.example.com/bigbatch/
Content-Format: application/dereference+link-format
Payload:
  &lt;coap://node1.example.com/.well-known/core?if=3Dcore.s&amp;rt=3Dtemper=
ature&gt;;ct=3D"40"

2.05 Content
Content-Format: application/senml+json
Payload:
  [{"bn": "coap://node1.example.com/s/", "bu": "degC",
    "n": "1/temp", "v": 16.4},
   {"n": "3/temp", "v": 20.3},
   {"n": "6/t-core", "v": 42.5}]
</pre>
<p id=3D"rfc.section.3.3.p.3">The hint that <samp>.well-known/core</samp> h=
as a representation in application/link-format (<samp>ct=3D"40"</samp>) is =
probably needless here, given that the device will hopefully know by itself=
 and might not even trigger a CoAP request to the resource it hosts itself =
if it can utilize its intrinsic knowledge in a more optimized way.</p>
<h1 id=3D"rfc.section.4">
<a href=3D"#rfc.section.4">4.</a> <a href=3D"#security-considerations" id=
=3D"security-considerations">Security considerations</a>
</h1>
<p id=3D"rfc.section.4.p.1">All kinds of things can go wrong with this.</p>
<p id=3D"rfc.section.4.p.2">Therefore, a recipient of a Derefere Link MUST =
NOT act on it unless it is following a concrete specification that has its =
own security considerations and policies on when a link should be followed.=
</p>
<h1 id=3D"rfc.references">
<a href=3D"#rfc.references">5.</a> References</h1>
<h1 id=3D"rfc.references.1">
<a href=3D"#rfc.references.1">5.1.</a> Normative References</h1>
<table><tbody>
<tr>
<td class=3D"reference"><b id=3D"RFC6690">[RFC6690]</b></td>
<td class=3D"top">
<a>Shelby, Z.</a>, "<a href=3D"https://tools.ietf.org/html/rfc6690">Constra=
ined RESTful Environments (CoRE) Link Format</a>", RFC 6690, DOI 10.17487/R=
FC6690, August 2012.</td>
</tr>
<tr>
<td class=3D"reference"><b id=3D"RFC6838">[RFC6838]</b></td>
<td class=3D"top">
<a>Freed, N.</a>, <a>Klensin, J.</a> and <a>T. Hansen</a>, "<a href=3D"http=
s://tools.ietf.org/html/rfc6838">Media Type Specifications and Registration=
 Procedures</a>", BCP 13, RFC 6838, DOI 10.17487/RFC6838, January 2013.</td>
</tr>
</tbody></table>
<h1 id=3D"rfc.references.2">
<a href=3D"#rfc.references.2">5.2.</a> Informative References</h1>
<table><tbody><tr>
<td class=3D"reference"><b id=3D"I-D.keranen-core-senml-fetch">[I-D.keranen=
-core-senml-fetch]</b></td>
<td class=3D"top">
<a>Keranen, A.</a> and <a>M. Mohajer</a>, "<a href=3D"https://tools.ietf.or=
g/html/draft-keranen-core-senml-fetch-02">FETCH &amp; PATCH with Sensor Mea=
surement Lists (SenML)</a>", Internet-Draft draft-keranen-core-senml-fetch-=
02, July 2018.</td>
</tr></tbody></table>
<h1 id=3D"rfc.appendix.A">
<a href=3D"#rfc.appendix.A">Appendix A.</a> <a href=3D"#examples" id=3D"exa=
mples">Examples</a>
</h1>
<p id=3D"rfc.section.A.p.1">data:application/dereference;http://www.example=
=2Ecom treated like http://www.example.com (if dereferencing allowed!)</p>
<h1 id=3D"rfc.authors"><a href=3D"#rfc.authors">Author's Address</a></h1>
<div class=3D"avoidbreak">
  <address class=3D"vcard">
	<span class=3D"vcardline">
	  <span class=3D"fn">Christian Ams&#252;ss</span>=20
	  <span class=3D"n hidden">
		<span class=3D"family-name">Ams&#252;ss</span>
	  </span>
	</span>
	<span class=3D"org vcardline"></span>
	<span class=3D"adr">
	  <span class=3D"vcardline">Hollandstr. 12/4</span>

	  <span class=3D"vcardline">
		<span class=3D"locality"></span>=20
		<span class=3D"region"></span>
		<span class=3D"code">1020</span>
	  </span>
	  <span class=3D"country-name vcardline">Austria</span>
	</span>
	<span class=3D"vcardline">Phone: +43-664-9790639</span>

<span class=3D"vcardline">EMail: <a href=3D"mailto:christian@amsuess.com">c=
hristian@amsuess.com</a></span>

  </address>
</div>
 =20
  <hr class=3D"noprint" />
  <h1 class=3D"np" id=3D"rfc.toc"><a href=3D"#rfc.toc">Table of Contents</a=
></h1>
  <ul class=3D"toc">

  	<li>1.   <a href=3D"#rfc.section.1">Introduction</a>
</li>
<li>2.   <a href=3D"#rfc.section.2">The Dereference Link type</a>
</li>
<ul><li>2.1.   <a href=3D"#rfc.section.2.1">Comparison to media-type specif=
ic inclusion</a>
</li>
</ul><li>3.   <a href=3D"#rfc.section.3">Use cases</a>
</li>
<ul><li>3.1.   <a href=3D"#rfc.section.3.1">Redirection</a>
</li>
<li>3.2.   <a href=3D"#rfc.section.3.2">Firmware uploads</a>
</li>
<li>3.3.   <a href=3D"#rfc.section.3.3">Parametrized SenML FETCH</a>
</li>
</ul><li>4.   <a href=3D"#rfc.section.4">Security considerations</a>
</li>
<li>5.   <a href=3D"#rfc.references">References</a>
</li>
<ul><li>5.1.   <a href=3D"#rfc.references.1">Normative References</a>
</li>
<li>5.2.   <a href=3D"#rfc.references.2">Informative References</a>
</li>
</ul><li>Appendix A.   <a href=3D"#rfc.appendix.A">Examples</a>
</li>
<li><a href=3D"#rfc.authors">Author's Address</a>
</li>


  </ul>

 =20

</body>
</html>

--jho1yZJdad60DJr+
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="draft-amsuess-core-dereference-type.txt"





CoRE                                                          C. Amsuess
Internet-Draft                                        September 27, 2018
Expires: March 31, 2019


         Expressing indirection in a dereferencing content type
               draft-amsuess-core-dereference-type-latest

Abstract

   [ See introduction ]

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 31, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.








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1.  Introduction

   The topic of providing a content format that indicates that a
   particular URI should be dereferenced instead of using the payload
   itself has come up time and again in CoRE [citation needed].

   Nobody has done anything about it.  [TDB: Check whether that's
   actually the case.]

   Until now.

2.  The Dereference Link type

   The Dereference Link type is a media type for use with RESTful
   systems that carries a very particular piece of information: That a
   representation of the requested resource is available at a given
   location.

   The location of that representation is expressed in an [RFC6690] link
   format document that contains only a single link whose target is
   expressed as a URI (ie. not a relative reference).  The link MAY
   contain target attributes, which the client MAY ignore.

   [ TBD: Detailed deliberations on whether to use link-format, just a
   plain URI, links-json or what so not - and whether a relative
   refrence can make sense. ]

   A Dereference Link always indicates semantic equivalence: It
   indicates that any information derived from its link target could
   also have been obtained from the requested resource.  It does not
   mean that any resource representation obtained of the target resource
   could be literally substituted for it.

   This specification does not prescribe any behavior to recipients of a
   Dereference Link, it is up to application descriptions to explore its
   security implications and to describe what a recipient may or may not
   do about it.

2.1.  Comparison to media-type specific inclusion

   Various media types contain built-in facilities to express the same
   intent as a Derefere Link:

   A HTML document can contain an "<iframe>" tag that is displayed full-
   screen.

   An SVG document can use the "<image>" tag to include another SVG file
   at the current location.



Amsuess                  Expires March 31, 2019                 [Page 2]

Internet-DraftExpressing indirection in a dereferencing coSeptember 2018


   The C preprocessor directive "#include" allows sourcing in code from
   a different file.  This is limited to local file systems, but
   preserves the semantics of the included file: If the included file
   contains an "#include" itself, its argument is interpreted relative
   to the included file's location.

   LaTeX's "\input" command does something differetn than the
   Dereference Link type: it includes a literal copy of the target file
   in the outer file's source code, and any relative references in there
   are interpreted relative to the outer document.

3.  Use cases

3.1.  Redirection

   People requested that CoAP have redirection - be served:

 GET coap://example.com/weather

 2.05 Content
 Content-Format: application/dereference+link-format
 Payload:
   <coap://example.net/weather-in-vienna>

 GET coap://example.net/weather-in-vienna

 2.05 Content
 Content-Format: application/senml+json
 Payload:
   [{"n": "urn:example:weather:VIE:temperature", "v": 16.5, "u": "Cel"}]

   Also works for POST operations:



















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   POST coap://node.example.com/create-long-report

   2.05 Content (sent immediately)
   Content-Format: application/dereference+link-format
   Payload:
     <coap://node.example.com/report-spool/123>

   GET coap://node.example.com/report-spool/123

   5.03 I'm Still Busy With That

   ...

   GET coap://node.example.com/report-spool/123

   2.05 Here You Go
   ...

3.2.  Firmware uploads

   Pushing a firmware upload using a close data source:

   PUT coap://node1.example.com/firmware
   Content-Format: application/dereference+link-format
   Payload:
     <coap://gateway.example.com/files/fw01234.bin>

   (Server goes there and fetches its firmware update)

   2.04 Changed

   Note that different application specifications might disagree on
   whether the server returns success immediately or whether it needs to
   obtain a full copy before doing so.

3.3.  Parametrized SenML FETCH

   A batch of SenML values can be accessed with a FETCH operation
   according to [I-D.keranen-core-senml-fetch] by sending a list of
   names to the batch and receiving a subset of its data.

   If one agrees that a list of names and a list of resource links are
   interchangable, a server might support more elaborate queries using a
   filter language it has already built in:







Amsuess                  Expires March 31, 2019                 [Page 4]

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FETCH coap://node1.example.com/bigbatch/
Content-Format: application/dereference+link-format
Payload:
  <coap://node1.example.com/.well-known/core?if=core.s&rt=temperature>;ct="40"

2.05 Content
Content-Format: application/senml+json
Payload:
  [{"bn": "coap://node1.example.com/s/", "bu": "degC",
    "n": "1/temp", "v": 16.4},
   {"n": "3/temp", "v": 20.3},
   {"n": "6/t-core", "v": 42.5}]

   The hint that ".well-known/core" has a representation in application/
   link-format ("ct="40"") is probably needless here, given that the
   device will hopefully know by itself and might not even trigger a
   CoAP request to the resource it hosts itself if it can utilize its
   intrinsic knowledge in a more optimized way.

4.  Security considerations

   All kinds of things can go wrong with this.

   Therefore, a recipient of a Derefere Link MUST NOT act on it unless
   it is following a concrete specification that has its own security
   considerations and policies on when a link should be followed.

5.  References

5.1.  Normative References

   [RFC6690]  Shelby, Z., "Constrained RESTful Environments (CoRE) Link
              Format", RFC 6690, DOI 10.17487/RFC6690, August 2012,
              <https://www.rfc-editor.org/info/rfc6690>.

   [RFC6838]  Freed, N., Klensin, J., and T. Hansen, "Media Type
              Specifications and Registration Procedures", BCP 13,
              RFC 6838, DOI 10.17487/RFC6838, January 2013,
              <https://www.rfc-editor.org/info/rfc6838>.

5.2.  Informative References

   [I-D.keranen-core-senml-fetch]
              Keranen, A. and M. Mohajer, "FETCH & PATCH with Sensor
              Measurement Lists (SenML)", draft-keranen-core-senml-
              fetch-02 (work in progress), July 2018.





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Appendix A.  Examples

   data:application/dereference;http://www.example.com treated like
   http://www.example.com (if dereferencing allowed!)

Author's Address

   Christian Amsuess
   Hollandstr. 12/4
   1020
   Austria

   Phone: +43-664-9790639
   Email: christian@amsuess.com





































Amsuess                  Expires March 31, 2019                 [Page 6]

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From nobody Thu Sep 27 23:45:39 2018
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Date: Wed, 26 Sep 2018 18:19:03 +0200
From: Christian =?iso-8859-1?Q?Ams=FCss?= <christian@amsuess.com>
To: core@ietf.org, dnssd@ietf.org
Cc: Hauke Petersen <hauke.petersen@fu-berlin.de>, Carsten Bormann <cabo@tzi.org>, Peter van der Stok <stokcons@bbhmail.nl>, michael.koster@smartthings.com, kerlyn@ieee.org, Ivaylo Petrov <ivaylo@ackl.io>, Jim Schaad <ietf@augustcellars.com>, Matthias Kovatsch <matthias.kovatsch@siemens.com>
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Subject: [core] Second Resource Directory plug test
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Hello groups and people interested in Resource Directory
interoperability,

there will be a second plug test on CoRE Resource Directory
implementations in about two weeks, please enter your preferred dates at
[1] if you want to participate; a date will be picked on October 2nd.

The test specification is under preparation and can be viewed at [2] for
the time being. A final version of the test specification, along with
the draft version to be used ([3] with editorial changes will be -15),
will be sent with the date announcement mail.

The test specification covers basic RD registration and the
administrative interface; we'll be happy to accomodate implementations
that provide only a subset of the described functionality. Also,
participants are welcome to try out additional Resource Directory
extensions like the DNS-SD mapping after covering the test specs.


Followup mails will go to the mailing lists that recieve this mail as
well as anyone entered in the Doodle; please forward this to potentially
interested parties. If you or they want to participate in the plug test
anonymously, please contact me directly; otherwise, it will be handled
as a public IETF event with names and email addresses sent out via
mailing lists.

Best regards
Christian

[1]: https://doodle.com/poll/9r6g34nv3vs4br6r
[2]: http://htmlpreview.github.io/?https://github.com/core-wg/resource-dire=
ctory/master/interop-RD-20180910.html
[3]: https://core-wg.github.io/resource-directory/draft-ietf-core-resource-=
directory.html

--=20
We are dreamers, shapers, singers, and makers.
  -- Elric

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From nobody Fri Sep 28 14:14:14 2018
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CC: core-chairs@ietf.org, Carsten Bormann <cabo@tzi.org>, draft-ietf-core-too-many-reqs@ietf.org, core@ietf.org, alexey.melnikov@isode.com, cabo@tzi.org
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Date: Fri, 28 Sep 2018 14:14:05 -0700
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Subject: [core] Last Call: <draft-ietf-core-too-many-reqs-04.txt> (Too Many Requests Response Code for the Constrained Application Protocol) to Proposed Standard
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The IESG has received a request from the Constrained RESTful Environments WG
(core) to consider the following document: - 'Too Many Requests Response Code
for the Constrained Application
   Protocol'
  <draft-ietf-core-too-many-reqs-04.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2018-10-12. Exceptionally, comments may be
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Abstract


   A Constrained Application Protocol (CoAP) server can experience
   temporary overload because one or more clients are sending requests
   to the server at a higher rate than the server is capable or willing
   to handle.  This document defines a new CoAP Response Code for a
   server to indicate that a client should reduce the rate of requests.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-core-too-many-reqs/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-core-too-many-reqs/ballot/


No IPR declarations have been submitted directly on this I-D.




