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From: "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
To: "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: Presentation Slides
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From nobody Sat Nov  8 09:01:49 2014
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From: Daryl Malas <D.Malas@cablelabs.com>
To: "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: [CDNi] Presentation Slides
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All,

We need all of the presentation slides by Sunday (tomorrow), noon.
Remember, our working group meets on Monday this time around.

Regards,

Daryl

On 11/6/14, 10:49 AM, "Francois Le Faucheur (flefauch)"
<flefauch@cisco.com> wrote:

>Hello,
>
>Please send asap to Daryl and I your draft slides for Monday=B9s meeting.
>
>As usual:
>	* include slide number at the bottom of each slide
>	* send us a PDF version (and a PPT version if possible so we can embed
>suggestions/comments if needed on draft versions).
>
>Cheers
>
>Francois
>_______________________________________________
>CDNi mailing list
>CDNi@ietf.org
>https://www.ietf.org/mailman/listinfo/cdni


From nobody Sat Nov  8 11:12:31 2014
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From: Jan Seedorf <Jan.Seedorf@neclab.eu>
To: "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: Review of the CDNI metadata draft
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As promised, I reviewed the -08 version of the metadata draft. Here are my =
comments:


n  In general, the draft reads well and the concepts are well-described and=
 clearly understandable (I briefly checked all the detailed object specific=
ations and found no errors); the draft is in a very mature state and indeed=
 seems ready for publication soon; also, the example in section 6 is very c=
lear; I just have a couple of detailed comments below

n  Section 1.2: it talks about capabilities (which are later on explained i=
n section 5) but there is no reference to the FCI documents; I think you sh=
ould add some text and refs on how the metadata capabilities relate to the =
CDNI FCI

n  Section 5: this text needs to be revised according to the latest decisio=
n we have made regarding the definition of MI FCI objects being outside of =
the metadata draft; but this decision has been announced on the mailing lis=
t after the -08 version was published, so obviously it could not have been =
addressed

n  Section 8 - Security Considerations: this section needs to be improved i=
n my view; it is not very clear about the difference between integrity and =
confidentiality (e.g. talks about using encryption to provide integrity, bu=
t usually digital signatures or HMACs are used for that); also the term "pr=
ivate" is used referring to dCDNs information (and not to end users), this =
needs to be clarified better; finally, among all the threats mentioned, sev=
eral key ones are missing, such as an attacker modifying unprotected CDNI m=
etadata in order to change restrictions etc. such that unauthorized end use=
rs may access content they are not supposed to (from the content provider p=
erspective this seems to be an important threat regarding CDNI)

n  TLS usage: from the attacker model described in section 8, it seems clea=
r that TLS is strongly advised and would fulfill the security requirements;=
 yet, in section 1.2 it reads like supported CDNI MI over TLS needs further=
 specifications, is this true?

n  I found several typos, but instead of listing them here I will pass on m=
y printout with the marks to the authors on-site at IETF-91


-          Jan

=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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Dr. Jan Seedorf
Senior Researcher
NEC Europe Ltd., NEC Laboratories Europe, Network Division Kurfuerstenanlag=
e 36, D-69115 Heidelberg Tel.     +49 (0)6221 4342-221
Fax:     +49 (0)6221 4342-155
e-mail:  jan.seedorf@neclab.eu<mailto:jan.seedorf@neclab.eu>
=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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
NEC Europe Ltd, Registered Office: Athene, Odyssey Business Park, West End =
 Road, London, HA4 6QE, GB, Registered in England 2832014


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</head>
<body lang=3D"DE" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">As promised, I reviewed the -08=
 version of the metadata draft. Here are my comments:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Win=
gdings"><span style=3D"mso-list:Ignore">n<span style=3D"font:7.0pt &quot;Ti=
mes New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">In general, the draft r=
eads well and the concepts are well-described and clearly understandable (I=
 briefly checked all the detailed object specifications and found no errors=
); the draft is in a very mature state
 and indeed seems ready for publication soon; also, the example in section =
6 is very clear; I just have a couple of detailed comments below<o:p></o:p>=
</span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Win=
gdings"><span style=3D"mso-list:Ignore">n<span style=3D"font:7.0pt &quot;Ti=
mes New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Section 1.2: it talks a=
bout capabilities (which are later on explained in section 5) but there is =
no reference to the FCI documents; I think you should add some text and ref=
s on how the metadata capabilities
 relate to the CDNI FCI<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Win=
gdings"><span style=3D"mso-list:Ignore">n<span style=3D"font:7.0pt &quot;Ti=
mes New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Section 5: this text ne=
eds to be revised according to the latest decision we have made regarding t=
he definition of MI FCI objects being outside of the metadata draft; but th=
is decision has been announced on
 the mailing list after the -08 version was published, so obviously it coul=
d not have been addressed<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Win=
gdings"><span style=3D"mso-list:Ignore">n<span style=3D"font:7.0pt &quot;Ti=
mes New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Section 8 &#8211; Secur=
ity Considerations: this section needs to be improved in my view; it is not=
 very clear about the difference between integrity and confidentiality (e.g=
. talks about using encryption to provide
 integrity, but usually digital signatures or HMACs are used for that); als=
o the term &#8220;private&#8221; is used referring to dCDNs information (an=
d not to end users), this needs to be clarified better; finally, among all =
the threats mentioned, several key ones are
 missing, such as an attacker modifying unprotected CDNI metadata in order =
to change restrictions etc. such that unauthorized end users may access con=
tent they are not supposed to (from the content provider perspective this s=
eems to be an important threat regarding
 CDNI)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Win=
gdings"><span style=3D"mso-list:Ignore">n<span style=3D"font:7.0pt &quot;Ti=
mes New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">TLS usage: from the att=
acker model described in section 8, it seems clear that TLS is strongly adv=
ised and would fulfill the security requirements; yet, in section 1.2 it re=
ads like supported CDNI MI over TLS
 needs further specifications, is this true?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Win=
gdings"><span style=3D"mso-list:Ignore">n<span style=3D"font:7.0pt &quot;Ti=
mes New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">I found several typos, =
but instead of listing them here I will pass on my printout with the marks =
to the authors on-site at IETF-91<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:20.25pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo3">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Jan<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dr. Jan Seedorf<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Senior Researcher<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">NEC Europe Ltd., NEC Laboratori=
es Europe, Network Division Kurfuerstenanlage 36, D-69115 Heidelberg Tel.&n=
bsp;&nbsp;&nbsp;&nbsp; &#43;49 (0)6221 4342-221<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Fax:&nbsp;&nbsp;&nbsp;&nbsp; &#=
43;49 (0)6221 4342-155<o:p></o:p></span></p>
<p class=3D"MsoNormal">e-mail:&nbsp; <a href=3D"mailto:jan.seedorf@neclab.e=
u"><span style=3D"color:blue">jan.seedorf@neclab.eu</span></a><o:p></o:p></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">NEC Europe Ltd, Registered Offi=
ce: Athene, Odyssey Business Park, West End&nbsp; Road, London, HA4 6QE, GB=
, Registered in England 2832014<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</body>
</html>

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From nobody Sun Nov  9 18:41:22 2014
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From: "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
To: "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: Draft presentation slides uploaded
Thread-Index: AQHP/I/OBCMLOCpkfkqalC8+hMPO9Q==
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CDNI presenters,

Slides have been uploaded on IETF-91 Materials site:
https://datatracker.ietf.org/meeting/91/materials.html

Please check you see what you expect.
Cheers

Francois

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<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space;" class=3D"">
CDNI presenters,
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Slides have been uploaded on IETF-91 Materials site:</div>
<div class=3D""><a href=3D"https://datatracker.ietf.org/meeting/91/material=
s.html" class=3D"">https://datatracker.ietf.org/meeting/91/materials.html</=
a></div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Please check you see what you expect.</div>
<div class=3D"">Cheers</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Francois</div>
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From nobody Sun Nov  9 19:29:35 2014
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Subject: Re: [CDNi] review comments to draft-ietf-cdni-metadata-08
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Linda,

I thought it would be worthwhile to post a summary of our hallway =
conversation just now on your question below for the benefit of the =
wider WG and to close this review comment.

You are essentially asking whether it would be possible to represent the =
data structures used by the CDNI Metadata draft in other formats, such =
as XML.

As we discussed just now, it is perfectly possible to represent the CDNI =
metadata data structures in other formats, but after some debate within =
the WG consensus was to specify the interfaces using JSON, which is what =
is specified in the Metadata document you kindly reviewed for us.

Regards
Ben

On 30 Oct 2014, at 15:53, Linda Dunbar <linda.dunbar@huawei.com> wrote:

> Ben,=20
>=20
> Your draft showed JSON model. The same information can be represented =
by other models, like XML or YANG.=20
>=20
> Therefore, I think it is better to have a section describing the =
information model, and have another section showing JSON data model.=20
>=20
> Linda=20
> -----Original Message-----
> From: Ben Niven-Jenkins [mailto:ben@niven-jenkins.co.uk]=20
> Sent: Tuesday, October 28, 2014 6:10 PM
> To: Linda Dunbar
> Cc: cdni@ietf.org; draft-ietf-cdni-metadata@tools.ietf.org
> Subject: Re: [CDNi] review comments to draft-ietf-cdni-metadata-08
>=20
> Linda,
>=20
> On 28 Oct 2014, at 22:22, Linda Dunbar <linda.dunbar@huawei.com> =
wrote:
>=20
>> Ben, Rob, Matt, and Kevin,
>>=20
>> Is section 3 meant for "Information Model"?
>>=20
>> I think there should be a section to describe the information model =
(or UML) for the CDNi Meta data before the actual data model.
>=20
> Could you expand a bit on what improvement you think including an =
information model would add to the document?
>=20
> I don't recall coming across something like that in other protocols =
specifications.
>=20
> Thanks
> Ben
>=20
>>=20
>> Linda
>=20


From nobody Mon Nov 10 05:12:24 2014
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: "draft-ietf-cdni-control-triggers@tools.ietf.org" <draft-ietf-cdni-control-triggers@tools.ietf.org>
Thread-Topic: [CDNi] Start of Working Group Last Call on "draft-ietf-cdni-control-triggers-04"
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Date: Mon, 10 Nov 2014 13:12:16 +0000
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Subject: Re: [CDNi] Start of Working Group Last Call on "draft-ietf-cdni-control-triggers-04"
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--_000_EE89EE3E66034DDFA3FF12B6B2DAB0A9ciscocom_--


From nobody Mon Nov 10 15:40:06 2014
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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 Content Delivery Networks Interconnection Working Group of the IETF.

        Title           : Request Routing Redirection Interface for CDN Interconnection
        Authors         : Ben Niven-Jenkins
                          Ray van Brandenburg
	Filename        : draft-ietf-cdni-redirection-05.txt
	Pages           : 29
	Date            : 2014-11-10

Abstract:
   The Request Routing Interface comprises of (1) the asynchronous
   advertisement of footprint and capabilities by a downstream CDN that
   allows a upstream CDN to decide whether to redirect particular user
   requests to that downstream CDN; and (2) the synchronous operation of
   an upstream CDN requesting whether a downstream CDN is prepared to
   accept a user request and of a downstream CDN responding with how to
   actually redirect the user request.  This document describes an
   interface for the latter part, i.e. the CDNI Request Routing
   Redirection interface.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-cdni-redirection/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-cdni-redirection-05

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-cdni-redirection-05


Please note that it may take a couple of minutes from the time of submission
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From nobody Mon Nov 10 15:41:34 2014
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Colleagues,

This update just contains a small number of editorial changes the =
editors noticed when preparing for IETF91.

Regards
Ben

On 10 Nov 2014, at 23:39, internet-drafts@ietf.org wrote:

>=20
> A New Internet-Draft is available from the on-line Internet-Drafts =
directories.
> This draft is a work item of the Content Delivery Networks =
Interconnection Working Group of the IETF.
>=20
>        Title           : Request Routing Redirection Interface for CDN =
Interconnection
>        Authors         : Ben Niven-Jenkins
>                          Ray van Brandenburg
> 	Filename        : draft-ietf-cdni-redirection-05.txt
> 	Pages           : 29
> 	Date            : 2014-11-10
>=20
> Abstract:
>   The Request Routing Interface comprises of (1) the asynchronous
>   advertisement of footprint and capabilities by a downstream CDN that
>   allows a upstream CDN to decide whether to redirect particular user
>   requests to that downstream CDN; and (2) the synchronous operation =
of
>   an upstream CDN requesting whether a downstream CDN is prepared to
>   accept a user request and of a downstream CDN responding with how to
>   actually redirect the user request.  This document describes an
>   interface for the latter part, i.e. the CDNI Request Routing
>   Redirection interface.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-cdni-redirection/
>=20
> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-ietf-cdni-redirection-05
>=20
> A diff from the previous version is available at:
> http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-cdni-redirection-05
>=20
>=20
> 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.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni


From nobody Mon Nov 10 16:23:49 2014
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From: "Kent Leung (kleung)" <kleung@cisco.com>
To: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Hi Matt. Just wondering if this supports the case when uCDN wants the dCDN =
to perform rate pacing only when delivering over a mobile network but use "=
normal" delivery over other access networks?

Kent

-----Original Message-----
From: CDNi [mailto:cdni-bounces@ietf.org] On Behalf Of Matt Caulfield (mcau=
lfie)
Sent: Monday, October 27, 2014 2:03 PM
To: cdni@ietf.org
Subject: [CDNi] FW: New Version Notification for draft-caulfield-cdni-rate-=
pacing-02.txt

This new version of the rate pacing draft incorporates comments from Franco=
is sent prior to the London meeting (March 2014).

Cheers,
Matt

-----Original Message-----
From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]=20
Sent: Monday, October 27, 2014 4:58 PM
To: Matt Caulfield (mcaulfie); Matt Caulfield (mcaulfie)
Subject: New Version Notification for draft-caulfield-cdni-rate-pacing-02.t=
xt


A new version of I-D, draft-caulfield-cdni-rate-pacing-02.txt
has been successfully submitted by Matt Caulfield and posted to the
IETF repository.

Name:		draft-caulfield-cdni-rate-pacing
Revision:	02
Title:		CDNI Rate Pacing
Document date:	2014-10-27
Group:		Individual Submission
Pages:		8
URL:            http://www.ietf.org/internet-drafts/draft-caulfield-cdni-ra=
te-pacing-02.txt
Status:         https://datatracker.ietf.org/doc/draft-caulfield-cdni-rate-=
pacing/
Htmlized:       http://tools.ietf.org/html/draft-caulfield-cdni-rate-pacing=
-02
Diff:           http://www.ietf.org/rfcdiff?url2=3Ddraft-caulfield-cdni-rat=
e-pacing-02

Abstract:
   Rate pacing is a class of network traffic shaping which limits the
   transmission rate of data over a network.  This document defines CDNI
   extensions for downstream CDNs to support rate pacing on behalf of
   upstream CDNs.


                                                                           =
      =20


Please note that it may take a couple of minutes from the time of submissio=
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The IETF Secretariat

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From nobody Mon Nov 10 16:26:18 2014
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From: Kevin Ma J <kevin.j.ma@ericsson.com>
To: "Kent Leung (kleung)" <kleung@cisco.com>, "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Subject: Re: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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could do it with different mobile/non-mobile URIs?
with the pacing metadata only on the mobile URIs?

> -----Original Message-----
> From: CDNi [mailto:cdni-bounces@ietf.org] On Behalf Of Kent Leung (kleung=
)
> Sent: Monday, November 10, 2014 7:24 PM
> To: Matt Caulfield (mcaulfie); cdni@ietf.org
> Subject: Re: [CDNi] New Version Notification for draft-caulfield-cdni-rat=
e-
> pacing-02.txt
>=20
> Hi Matt. Just wondering if this supports the case when uCDN wants the dCD=
N
> to perform rate pacing only when delivering over a mobile network but use
> "normal" delivery over other access networks?
>=20
> Kent
>=20
> -----Original Message-----
> From: CDNi [mailto:cdni-bounces@ietf.org] On Behalf Of Matt Caulfield
> (mcaulfie)
> Sent: Monday, October 27, 2014 2:03 PM
> To: cdni@ietf.org
> Subject: [CDNi] FW: New Version Notification for draft-caulfield-cdni-rat=
e-
> pacing-02.txt
>=20
> This new version of the rate pacing draft incorporates comments from
> Francois sent prior to the London meeting (March 2014).
>=20
> Cheers,
> Matt
>=20
> -----Original Message-----
> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> Sent: Monday, October 27, 2014 4:58 PM
> To: Matt Caulfield (mcaulfie); Matt Caulfield (mcaulfie)
> Subject: New Version Notification for draft-caulfield-cdni-rate-pacing-
> 02.txt
>=20
>=20
> A new version of I-D, draft-caulfield-cdni-rate-pacing-02.txt
> has been successfully submitted by Matt Caulfield and posted to the
> IETF repository.
>=20
> Name:		draft-caulfield-cdni-rate-pacing
> Revision:	02
> Title:		CDNI Rate Pacing
> Document date:	2014-10-27
> Group:		Individual Submission
> Pages:		8
> URL:            http://www.ietf.org/internet-drafts/draft-caulfield-cdni-
> rate-pacing-02.txt
> Status:         https://datatracker.ietf.org/doc/draft-caulfield-cdni-rat=
e-
> pacing/
> Htmlized:       http://tools.ietf.org/html/draft-caulfield-cdni-rate-paci=
ng-
> 02
> Diff:           http://www.ietf.org/rfcdiff?url2=3Ddraft-caulfield-cdni-r=
ate-
> pacing-02
>=20
> Abstract:
>    Rate pacing is a class of network traffic shaping which limits the
>    transmission rate of data over a network.  This document defines CDNI
>    extensions for downstream CDNs to support rate pacing on behalf of
>    upstream CDNs.
>=20
>=20
>=20
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> The IETF Secretariat
>=20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni
>=20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni


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From: "Kent Leung (kleung)" <kleung@cisco.com>
To: Kevin Ma J <kevin.j.ma@ericsson.com>, "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Subject: Re: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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OK. That's one way to accomplish that. Should that be the only way?

Kent

-----Original Message-----
From: Kevin Ma J [mailto:kevin.j.ma@ericsson.com]=20
Sent: Monday, November 10, 2014 4:26 PM
To: Kent Leung (kleung); Matt Caulfield (mcaulfie); cdni@ietf.org
Subject: RE: New Version Notification for draft-caulfield-cdni-rate-pacing-=
02.txt

could do it with different mobile/non-mobile URIs?
with the pacing metadata only on the mobile URIs?

> -----Original Message-----
> From: CDNi [mailto:cdni-bounces@ietf.org] On Behalf Of Kent Leung=20
> (kleung)
> Sent: Monday, November 10, 2014 7:24 PM
> To: Matt Caulfield (mcaulfie); cdni@ietf.org
> Subject: Re: [CDNi] New Version Notification for=20
> draft-caulfield-cdni-rate- pacing-02.txt
>=20
> Hi Matt. Just wondering if this supports the case when uCDN wants the=20
> dCDN to perform rate pacing only when delivering over a mobile network=20
> but use "normal" delivery over other access networks?
>=20
> Kent
>=20
> -----Original Message-----
> From: CDNi [mailto:cdni-bounces@ietf.org] On Behalf Of Matt Caulfield
> (mcaulfie)
> Sent: Monday, October 27, 2014 2:03 PM
> To: cdni@ietf.org
> Subject: [CDNi] FW: New Version Notification for=20
> draft-caulfield-cdni-rate- pacing-02.txt
>=20
> This new version of the rate pacing draft incorporates comments from=20
> Francois sent prior to the London meeting (March 2014).
>=20
> Cheers,
> Matt
>=20
> -----Original Message-----
> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> Sent: Monday, October 27, 2014 4:58 PM
> To: Matt Caulfield (mcaulfie); Matt Caulfield (mcaulfie)
> Subject: New Version Notification for=20
> draft-caulfield-cdni-rate-pacing- 02.txt
>=20
>=20
> A new version of I-D, draft-caulfield-cdni-rate-pacing-02.txt
> has been successfully submitted by Matt Caulfield and posted to the=20
> IETF repository.
>=20
> Name:		draft-caulfield-cdni-rate-pacing
> Revision:	02
> Title:		CDNI Rate Pacing
> Document date:	2014-10-27
> Group:		Individual Submission
> Pages:		8
> URL:            http://www.ietf.org/internet-drafts/draft-caulfield-cdni-
> rate-pacing-02.txt
> Status:         https://datatracker.ietf.org/doc/draft-caulfield-cdni-rat=
e-
> pacing/
> Htmlized:       http://tools.ietf.org/html/draft-caulfield-cdni-rate-paci=
ng-
> 02
> Diff:           http://www.ietf.org/rfcdiff?url2=3Ddraft-caulfield-cdni-r=
ate-
> pacing-02
>=20
> Abstract:
>    Rate pacing is a class of network traffic shaping which limits the
>    transmission rate of data over a network.  This document defines CDNI
>    extensions for downstream CDNs to support rate pacing on behalf of
>    upstream CDNs.
>=20
>=20
>=20
>=20
>=20
> Please note that it may take a couple of minutes from the time of=20
> submission until the htmlized version and diff are available at tools.iet=
f.org.
>=20
> The IETF Secretariat
>=20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni
>=20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni


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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>, "Kent Leung (kleung)" <kleung@cisco.com>
Thread-Topic: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Date: Tue, 11 Nov 2014 14:31:58 +0000
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From: Kevin Ma J <kevin.j.ma@ericsson.com>
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From: "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
To: "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: Liaison Statement on URI Signing for MPEG-DASH
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Date: Tue, 11 Nov 2014 23:17:01 +0000
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--_000_EC00C70EC176455B8FE028A359C05A72ciscocom_
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Hello,

Here is the pointer to the liaison statement from MPEG related to URI signi=
ng that was discussed during our meeting Yesterday.

https://datatracker.ietf.org/liaison/1342/

Cheers

Francois


--_000_EC00C70EC176455B8FE028A359C05A72ciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space;" class=3D"">
<div class=3D"">Hello,</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Here is the pointer to the liaison statement from MPEG rela=
ted to URI signing that was discussed during our meeting Yesterday.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D""><a href=3D"https://datatracker.ietf.org/liaison/1342/" clas=
s=3D"">https://datatracker.ietf.org/liaison/1342/</a></div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Cheers</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Francois</div>
<div class=3D""><br class=3D"">
</div>
</body>
</html>

--_000_EC00C70EC176455B8FE028A359C05A72ciscocom_--


From nobody Wed Nov 12 07:28:44 2014
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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: Kevin Ma J <kevin.j.ma@ericsson.com>, "mal.hubert@bt.com" <mal.hubert@bt.com>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>, "Kent Leung (kleung)" <kleung@cisco.com>
Thread-Topic: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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From nobody Wed Nov 12 18:37:02 2014
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To: Francois Le Faucher <flefauch@cisco.com>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Francois, Colleagues,

On 11 Nov 2014, at 23:17, Francois Le Faucheur (flefauch) =
<flefauch@cisco.com> wrote:

> Hello,
>=20
> Here is the pointer to the liaison statement from MPEG related to URI =
signing that was discussed during our meeting Yesterday.
>=20
> https://datatracker.ietf.org/liaison/1342/

I read the liaison statement from MPEG.

If I understand it correctly MPEG have a use case where they want to =
present something similar to a CDN authorisation token (the URI =
signature in draft-ietf-cdni-uri-signing) and have the delivery node =
(could be a server or a CDN, etc) take some action based on the presence =
and validity of such a token.

At that level it seems very similar to a CDN authorisation token and so =
it may be that there is significant reuse between =
draft-ietf-cdni-uri-signing & what MPEG are thinking of.

It is difficult to say more, as the actual use case is not clear to me - =
e.g. the liaison says "the mechanisms provided by URI signing can also =
be applied to allow for other use cases, e.g. to prevent a client from =
skipping pre-roll and mid-roll advertisement"

I am struggling to understand how MPEG envision that use case being =
implemented, as skipping adverts is a client function not a server =
function AIUI.

It seems to me that we may be able to help MPEG here and we may already =
have something of use to them (or most of something that might only =
require some small tweaks), but without more details from MPEG of their =
use case(s) and how they envision the "call flow" working it is hard to =
say more.

Maybe the next step should be to respond to MPEG asking for further =
details on their use case so we can better assess the re-usability (and =
applicability) of draft-ietf-cdni-uri-signing for their use case(s).

Ben

>=20
> Cheers
>=20
> Francois
>=20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni


From nobody Wed Nov 12 18:39:43 2014
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From: "Ali C. Begen (abegen)" <abegen@cisco.com>
To: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Cc: "cdni@ietf.org" <cdni@ietf.org>, "Thomas, E.D.R. \(Emmanuel\)" <emmanuel.thomas@tno.nl>
Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Well if you dont mind, I am copying Emmanuel in case he wants to respond. h=
e may comment on the mpeg stuff.

> On Nov 12, 2014, at 4:36 PM, Ben Niven-Jenkins <ben@niven-jenkins.co.uk> =
wrote:
>=20
> Francois, Colleagues,
>=20
> On 11 Nov 2014, at 23:17, Francois Le Faucheur (flefauch) <flefauch@cisco=
.com> wrote:
>=20
>> Hello,
>>=20
>> Here is the pointer to the liaison statement from MPEG related to URI si=
gning that was discussed during our meeting Yesterday.
>>=20
>> https://datatracker.ietf.org/liaison/1342/
>=20
> I read the liaison statement from MPEG.
>=20
> If I understand it correctly MPEG have a use case where they want to pres=
ent something similar to a CDN authorisation token (the URI signature in dr=
aft-ietf-cdni-uri-signing) and have the delivery node (could be a server or=
 a CDN, etc) take some action based on the presence and validity of such a =
token.
>=20
> At that level it seems very similar to a CDN authorisation token and so i=
t may be that there is significant reuse between draft-ietf-cdni-uri-signin=
g & what MPEG are thinking of.
>=20
> It is difficult to say more, as the actual use case is not clear to me - =
e.g. the liaison says "the mechanisms provided by URI signing can also be a=
pplied to allow for other use cases, e.g. to prevent a client from skipping=
 pre-roll and mid-roll advertisement"
>=20
> I am struggling to understand how MPEG envision that use case being imple=
mented, as skipping adverts is a client function not a server function AIUI=
.
>=20
> It seems to me that we may be able to help MPEG here and we may already h=
ave something of use to them (or most of something that might only require =
some small tweaks), but without more details from MPEG of their use case(s)=
 and how they envision the "call flow" working it is hard to say more.
>=20
> Maybe the next step should be to respond to MPEG asking for further detai=
ls on their use case so we can better assess the re-usability (and applicab=
ility) of draft-ietf-cdni-uri-signing for their use case(s).
>=20
> Ben
>=20
>>=20
>> Cheers
>>=20
>> Francois
>>=20
>> _______________________________________________
>> CDNi mailing list
>> CDNi@ietf.org
>> https://www.ietf.org/mailman/listinfo/cdni
>=20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni


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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, Francois Le Faucher <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk>
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, Francois Le Faucher <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From: Kevin Ma J <kevin.j.ma@ericsson.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, Francois Le Faucher <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Thu, 13 Nov 2014 16:57:54 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From: Kevin Ma J <kevin.j.ma@ericsson.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, Francois Le Faucher <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Thu, 13 Nov 2014 17:08:07 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From nobody Thu Nov 13 15:44:24 2014
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From: "B.Khasnabish@ieee.org" <vumip1@gmail.com>
To: "cdni@ietf.org" <cdni@ietf.org>
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Subject: [CDNi] Fwd: updated Cloud Reference Framework draft (draft-khasnabish-cloud-reference-framework-07.txt)
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--047d7bae47a259f7890507c6178d
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Dear All,

We have recently updated the Cloud Reference
Framework (CRF) draft
(draft-khasnabish-cloud-reference-framework-07.txt,
http://datatracker.ietf.org/doc/draft-khasnabish-cloud-reference-framework/
).

PLEASE note that Sec. 4 of that draft discusses Inter-Cloud Framework
which may be helpful for CDNI media-cloud framework discussion.

Kindly provide your thoughts and suggestions ASAP.

Many thanks in advance.

Best.
Bhumip and the other
CRF draft Authors

--047d7bae47a259f7890507c6178d
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div style=3D"font-family:georgia,serif;font-size:large" c=
lass=3D"gmail_default"><span lang=3D"EN">Dear All,</span></div><div style=
=3D"font-family:georgia,serif;font-size:large" class=3D"gmail_default"><spa=
n lang=3D"EN"></span>=C2=A0</div><div style=3D"font-family:georgia,serif;fo=
nt-size:large" class=3D"gmail_default"><span lang=3D"EN">We have recently u=
pdated the Cloud Reference <br>Framework (CRF) draft<br>(draft-khasnabish-c=
loud-reference-framework-07.txt, <br><a href=3D"http://datatracker.ietf.org=
/doc/draft-khasnabish-cloud-reference-framework/" target=3D"_blank">http://=
datatracker.ietf.org/doc/draft-khasnabish-cloud-reference-framework/</a>).<=
/span></div><div style=3D"font-family:georgia,serif;font-size:large" class=
=3D"gmail_default"><span lang=3D"EN"></span>=C2=A0</div><div style=3D"font-=
family:georgia,serif;font-size:large" class=3D"gmail_default"><span lang=3D=
"EN">PLEASE note that Sec. 4 of that draft discusses Inter-Cloud Framework =
<br>which may be helpful for CDNI media-cloud framework discussion.</span><=
/div><div style=3D"font-family:georgia,serif;font-size:large" class=3D"gmai=
l_default"><span lang=3D"EN"></span>=C2=A0</div><div style=3D"font-family:g=
eorgia,serif;font-size:large" class=3D"gmail_default"><span lang=3D"EN">Kin=
dly provide your thoughts and suggestions ASAP.</span></div><div style=3D"f=
ont-family:georgia,serif;font-size:large" class=3D"gmail_default"><span lan=
g=3D"EN"></span>=C2=A0</div><div style=3D"font-family:georgia,serif;font-si=
ze:large" class=3D"gmail_default"><span lang=3D"EN">Many thanks in advance.=
</span></div><div style=3D"font-family:georgia,serif;font-size:large" class=
=3D"gmail_default"><span lang=3D"EN"></span>=C2=A0</div><div style=3D"font-=
family:georgia,serif;font-size:large" class=3D"gmail_default"><span lang=3D=
"EN">Best.</span></div><div style=3D"font-family:georgia,serif;font-size:la=
rge" class=3D"gmail_default"><span lang=3D"EN">Bhumip and the other</span><=
/div><div style=3D"font-family:georgia,serif;font-size:large" class=3D"gmai=
l_default"><span lang=3D"EN">CRF draft Authors</span></div>
</div>

--047d7bae47a259f7890507c6178d--


From nobody Thu Nov 13 19:14:30 2014
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From: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
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Subject: [CDNi] (Not) Skipping adverts
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Ray, Colleagues,

I think it's worth separating out the two use cases you outline below, =
hence changing the subject line.

See inline...

On 13 Nov 2014, at 07:08, Brandenburg, R. (Ray) van =
<ray.vanbrandenburg@tno.nl> wrote:

> Hi Ben,
>=20
> I=92ve been part of some of the discussion in MPEG, and I understand =
the=20
> MPEG use cases to be the following:
>=20
> The primary use case is to apply access control, as covered by the =
current=20
> URI signing draft, to segmented content. Due to the manifest/MPD, =
regular=20
> URI signing as specified in our draft does not work, since there is no=20=

> redirect involved. However, by adding some features to the current =
draft=20
> (e.g signed cookies or chained requests), we might be able to have the=20=

> same mechanism work for HTTP adaptive streaming content as well.=20

I'll respond to this point by replying to your other e-mail.
=20
> Regarding preventing the client from skipping pre-roll ads, I think =
what=20
> is meant there is that if you have a mechanism that allows the =
server/CDN=20
> to reject certain requests based on a set of (signed) parameters in =
the=20
> HTTP request, one could use these same mechanisms for other purposes =
as=20
> well. For example, by adding valid-from and segment-pattern =
enforcement=20
> attributes, one could make the CDN reject any request for specific=20
> segments until a give (relative) point in time, thereby preventing the=20=

> client from obtaining any contents segments until the pre-roll =
segments=20
> have been downloaded/watched.=20

I don't completely understand how that is envisioned to work, but I =
don't think it will actually achieve what people might think it will and =
it potentially places additional complexity on the delivery server =
(origin, surrogate, CDN, etc) for no reason.

Unless I've misunderstood (which I may well have), I think preventing =
skipping of adverts is a policy level choice that exists at a layer =
above the delivery of the content itself.

E.g. just because something is delivered (i.e. the server sends the =
bytes), doesn't enforce that those bytes were rendered on the screen.

It would seem to me that the only way to enforce play out is to have a =
player that understands (somehow) the content provider's policy with =
respect to adverts and enforces that policy locally. Any other solution =
is unlikely to be able to enforce that policy in all cases (at least for =
HTTP adaptive streaming as currently defined).

Ben
=20
>=20
> I have had some off-list discussion with Kent on the merits of various=20=

> solution directions during the past few months. I will share those in =
a=20
> mail to the list later today.
>=20
> Best regards,
>=20
> Ray=20
>=20
>=20
>=20
> On 13/11/14 02:36, "Ben Niven-Jenkins" <ben@niven-jenkins.co.uk> =
wrote:
>=20
>> Francois, Colleagues,
>>=20
>> On 11 Nov 2014, at 23:17, Francois Le Faucheur (flefauch)=20
>> <flefauch@cisco.com> wrote:
>>=20
>>> Hello,
>>>=20
>>> Here is the pointer to the liaison statement from MPEG related to =
URI=20
>>> signing that was discussed during our meeting Yesterday.
>>>=20
>>> https://datatracker.ietf.org/liaison/1342/
>>=20
>> I read the liaison statement from MPEG.
>>=20
>> If I understand it correctly MPEG have a use case where they want to=20=

>> present something similar to a CDN authorisation token (the URI =
signature=20
>> in draft-ietf-cdni-uri-signing) and have the delivery node (could be =
a=20
>> server or a CDN, etc) take some action based on the presence and =
validity=20
>> of such a token.
>>=20
>> At that level it seems very similar to a CDN authorisation token and =
so=20
>> it may be that there is significant reuse between=20
>> draft-ietf-cdni-uri-signing & what MPEG are thinking of.
>>=20
>> It is difficult to say more, as the actual use case is not clear to =
me -=20
>> e.g. the liaison says "the mechanisms provided by URI signing can =
also be=20
>> applied to allow for other use cases, e.g. to prevent a client from=20=

>> skipping pre-roll and mid-roll advertisement"
>>=20
>> I am struggling to understand how MPEG envision that use case being=20=

>> implemented, as skipping adverts is a client function not a server=20
>> function AIUI.
>>=20
>> It seems to me that we may be able to help MPEG here and we may =
already=20
>> have something of use to them (or most of something that might only=20=

>> require some small tweaks), but without more details from MPEG of =
their=20
>> use case(s) and how they envision the "call flow" working it is hard =
to=20
>> say more.
>>=20
>> Maybe the next step should be to respond to MPEG asking for further=20=

>> details on their use case so we can better assess the re-usability =
(and=20
>> applicability) of draft-ietf-cdni-uri-signing for their use case(s).
>>=20
>> Ben
>>=20
>>>=20
>>> Cheers
>>>=20
>>> Francois
>>>=20
>>> _______________________________________________
>>> CDNi mailing list
>>> CDNi@ietf.org
>>> https://www.ietf.org/mailman/listinfo/cdni
>>=20
>> _______________________________________________
>> CDNi mailing list
>> CDNi@ietf.org
>> https://www.ietf.org/mailman/listinfo/cdni
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From nobody Thu Nov 13 19:42:56 2014
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From: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
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To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
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Subject: [CDNi] Authorisation tokens (was Re: Liaison Statement on URI Signing for MPEG-DASH)
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Ray, Colleagues,

I think what you're suggesting here is changing the scope of the =
document from how to sign a particular URL to describing how to mint (& =
possibly present) an "authorisation token" that authorises the client =
the be able to retrieve the content from 1 or more URLs.

I have no objection to that, but just want to make sure we're all on the =
same page.

More inline...

On 13 Nov 2014, at 16:18, Brandenburg, R. (Ray) van =
<ray.vanbrandenburg@tno.nl> wrote:

> Hi all,
>=20
> As I mentioned in my previous mail, as authors of the URI signing =
draft,=20
> Kent, Francois and I have been discussing how to deal with the request=20=

> from MPEG. Now that we=92ve somewhat converged on a possible solution=20=

> direction, we would like to ask the WG for an opinion.=20
>=20
> The main problem at hand is the fact that in both DASH as well as =
other=20
> HTTP adaptive streaming content (e.g. HLS or Smooth Streaming), a=20
> manifest/MPD is used. Due to this manifest, content requests do not go=20=

> through a redirect from content provider to CDN and can therefore not =
be=20
> signed/validated.=20

Can you expand a bit more on this. i.e. I am not seeing the relevance of =
the manifest and how it prevents "signing/validation"?

Are you saying content providers do not want to create per-user =
manifests or something else?

> The general solution direction we=92ve been discussing is setting up a =
sort=20
> of authorization chain, from the initial request for the manifest/MPD =
to=20
> every individual segment request. The idea is that when the UA is=20
> initially redirected to the CDN, e.g. for the initial manifest =
request, it=20
> receives some kind of token. It can then use this token for the first=20=

> segment request, after which it receives a second token for the second=20=

> segment, and so on. By limiting the validity time of each token using =
a=20
> method similar to that of the Expiry Time Enforcement Attribute in the=20=

> current URI signing draft, one can limit the vulnerability of the UA=20=

> handing out the token to other malicious UAs.

Why have the complexity of an authorisation chain? If you had an =
authorisation token that authorised access to multiple URLs with a =
single expiry time, would that be sufficient?

> One of the things we=92ve been debating is what is the best way to =
implement=20
> this token. Basically, we=92ve explored two solutions for this:=20
>=20
> 1. Cookie-based. In this case the token is implemented as a cookie. =
The=20
> advantage of this solution is that the client doesn=92t have to be =
adapted=20
> and it is therefore not limited to DASH but also works for e.g. HLS. =
The=20
> downside of this solution is that it doesn=92t work if the manifest is=20=

> delivered out-of-band, e.g via the Content Provider.=20

When you say out of band, do you really mean that the manifest is served =
from a different domain to the video chunks?

> 2. Header-query-string based. In this case, instead of sending the =
token=20
> as a Set-Cookie header, it is returned to the UA as a another custom =
HTTP=20
> header. The client then extracts the value of the HTTP header and =
places=20
> it into the URL query string of the next segment request (as indicated =
by=20
> the MPD). MPEG DASH already provides the necessary mechanisms for=20
> signalling this. The advantage of this mechanism is that it is =
potentially=20
> more flexible. The downside is that it requires changes to the client =
and=20
> will therefore only work for DASH clients.

I think there may be other solutions that provide the flexibility you =
desire, without requiring custom client logic as required by having a =
special HTTP header.

Once I have a better idea of the scenario you are envisaging, i.e. =
answers to my questions above, I may be able to suggest a 3rd way.

> Another topic we=92ve been discussing is how to signal the set of =
segments=20
> for which a particular token is valid. Here we=92ve discussed the=20
> possibility of adding a segment-pattern enforcement attribute. This =
way it=20
> would be possible to for example signal that a specific token is only=20=

> valid for segments belonging to the same content item, or even of a=20
> specific quality. The main question here is how to best signal such a=20=

> segment pattern. One possibility here is to use URI templates.=20

URI templates are one way, something like the PatternMatch in the =
metadata document is another (simpler but less expressive) way.

Ben

>=20
> Since this has turned into quite a lengthy mail, I think I=92ll leave =
some=20
> of the other questions for later.=20
>=20
> What do you guys think? Is this a topic that we should be tackling at =
all?=20
> And if so, what do you think of the proposed solution directions?
>=20
> Best regards,
>=20
> Ray
>=20
>=20
>=20
>=20
>=20
> On 13/11/14 07:08, "Brandenburg, R. (Ray) van" =
<ray.vanbrandenburg@tno.nl>=20
> wrote:
>=20
>> Hi Ben,
>>=20
>> I=92ve been part of some of the discussion in MPEG, and I understand =
the=20
>> MPEG use cases to be the following:
>>=20
>> The primary use case is to apply access control, as covered by the=20
>> current=20
>> URI signing draft, to segmented content. Due to the manifest/MPD, =
regular=20
>> URI signing as specified in our draft does not work, since there is =
no=20
>> redirect involved. However, by adding some features to the current =
draft=20
>> (e.g signed cookies or chained requests), we might be able to have =
the=20
>> same mechanism work for HTTP adaptive streaming content as well.=20
>>=20
>> Regarding preventing the client from skipping pre-roll ads, I think =
what=20
>> is meant there is that if you have a mechanism that allows the =
server/CDN=20
>> to reject certain requests based on a set of (signed) parameters in =
the=20
>> HTTP request, one could use these same mechanisms for other purposes =
as=20
>> well. For example, by adding valid-from and segment-pattern =
enforcement=20
>> attributes, one could make the CDN reject any request for specific=20
>> segments until a give (relative) point in time, thereby preventing =
the=20
>> client from obtaining any contents segments until the pre-roll =
segments=20
>> have been downloaded/watched.=20
>>=20
>> I have had some off-list discussion with Kent on the merits of =
various=20
>> solution directions during the past few months. I will share those in =
a=20
>> mail to the list later today.
>>=20
>> Best regards,
>>=20
>> Ray=20
>>=20
>>=20
>>=20
>> On 13/11/14 02:36, "Ben Niven-Jenkins" <ben@niven-jenkins.co.uk> =
wrote:
>>=20
>>> Francois, Colleagues,
>>>=20
>>> On 11 Nov 2014, at 23:17, Francois Le Faucheur (flefauch)=20
>>> <flefauch@cisco.com> wrote:
>>>=20
>>>> Hello,
>>>>=20
>>>> Here is the pointer to the liaison statement from MPEG related to =
URI=20
>>>> signing that was discussed during our meeting Yesterday.
>>>>=20
>>>> https://datatracker.ietf.org/liaison/1342/
>>>=20
>>> I read the liaison statement from MPEG.
>>>=20
>>> If I understand it correctly MPEG have a use case where they want to=20=

>>> present something similar to a CDN authorisation token (the URI=20
>>> signature=20
>>> in draft-ietf-cdni-uri-signing) and have the delivery node (could be =
a=20
>>> server or a CDN, etc) take some action based on the presence and=20
>>> validity=20
>>> of such a token.
>>>=20
>>> At that level it seems very similar to a CDN authorisation token and =
so=20
>>> it may be that there is significant reuse between=20
>>> draft-ietf-cdni-uri-signing & what MPEG are thinking of.
>>>=20
>>> It is difficult to say more, as the actual use case is not clear to =
me -=20
>>> e.g. the liaison says "the mechanisms provided by URI signing can =
also=20
>>> be=20
>>> applied to allow for other use cases, e.g. to prevent a client from=20=

>>> skipping pre-roll and mid-roll advertisement"
>>>=20
>>> I am struggling to understand how MPEG envision that use case being=20=

>>> implemented, as skipping adverts is a client function not a server=20=

>>> function AIUI.
>>>=20
>>> It seems to me that we may be able to help MPEG here and we may =
already=20
>>> have something of use to them (or most of something that might only=20=

>>> require some small tweaks), but without more details from MPEG of =
their=20
>>> use case(s) and how they envision the "call flow" working it is hard =
to=20
>>> say more.
>>>=20
>>> Maybe the next step should be to respond to MPEG asking for further=20=

>>> details on their use case so we can better assess the re-usability =
(and=20
>>> applicability) of draft-ietf-cdni-uri-signing for their use case(s).
>>>=20
>>> Ben
>>>=20
>>>>=20
>>>> Cheers
>>>>=20
>>>> Francois
>>>>=20
>>>> _______________________________________________
>>>> CDNi mailing list
>>>> CDNi@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/cdni
>>>=20
>>> _______________________________________________
>>> CDNi mailing list
>>> CDNi@ietf.org
>>> https://www.ietf.org/mailman/listinfo/cdni
>> This message may contain information that is not intended for you. If =
you=20
>> are not the addressee or if this message was sent to you by mistake, =
you=20
>> are requested to inform the sender and delete the message. TNO =
accepts no=20
>> liability for the content of this e-mail, for the manner in which you =
use=20
>> it and for damage of any kind resulting from the risks inherent to =
the=20
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>> _______________________________________________
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>> https://www.ietf.org/mailman/listinfo/cdni
> This message may contain information that is not intended for you. If =
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you are requested to inform the sender and delete the message. TNO =
accepts no liability for the content of this e-mail, for the manner in =
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: Kevin Ma J <kevin.j.ma@ericsson.com>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, Francois Le Faucher <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Fri, 14 Nov 2014 07:25:03 +0000
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <E3479D38-1AB8-40E7-8D52-77D1FC94B995@tno.nl> <A419F67F880AB2468214E154CB8A55629D430F@eusaamb103.ericsson.se>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From nobody Thu Nov 13 23:33:25 2014
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
Thread-Topic: Authorisation tokens (was Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH)
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Date: Fri, 14 Nov 2014 07:33:19 +0000
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <E3479D38-1AB8-40E7-8D52-77D1FC94B995@tno.nl> <23B35B9C-2060-4FD6-9B2C-7D1E615CCCAD@niven-jenkins.co.uk>
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Subject: Re: [CDNi] Authorisation tokens (was Re: Liaison Statement on URI Signing for MPEG-DASH)
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
Thread-Topic: (Not) Skipping adverts
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Date: Fri, 14 Nov 2014 07:35:40 +0000
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <0BC660AA-F671-45A6-8492-41D28CDA0150@niven-jenkins.co.uk>
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Subject: Re: [CDNi] (Not) Skipping adverts
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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Fri, 14 Nov 2014 15:55:54 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
Thread-Topic: (Not) Skipping adverts
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Date: Fri, 14 Nov 2014 16:02:34 +0000
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Subject: Re: [CDNi] (Not) Skipping adverts
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From: Kevin Ma J <kevin.j.ma@ericsson.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, Francois Le Faucher <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Sat, 15 Nov 2014 22:30:12 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From nobody Sat Nov 15 23:37:11 2014
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Sun, 16 Nov 2014 07:37:01 +0000
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <E3479D38-1AB8-40E7-8D52-77D1FC94B995@tno.nl> <166EBB70C264A9479E459B01B1BA6C926D62FDF4@xmb-aln-x03.cisco.com>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From nobody Sat Nov 15 23:54:34 2014
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: Kevin Ma J <kevin.j.ma@ericsson.com>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, Francois Le Faucher <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Sun, 16 Nov 2014 07:54:26 +0000
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <E3479D38-1AB8-40E7-8D52-77D1FC94B995@tno.nl> <A419F67F880AB2468214E154CB8A55629D430F@eusaamb103.ericsson.se> <84915754-06B7-4AFD-8E5B-E0518B86F7E4@tno.nl> <A419F67F880AB2468214E154CB8A55629E529F@eusaamb103.ericsson.se>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
Thread-Index: AQHP/gWZcjC4WeJbFUStxfdC8RpP1JxePdmAgABL0wCAAJm0gIABI9xwgAMBhYCAAQvfwA==
Date: Mon, 17 Nov 2014 05:46:19 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From nobody Mon Nov 17 02:27:48 2014
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Mon, 17 Nov 2014 10:27:36 +0000
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <E3479D38-1AB8-40E7-8D52-77D1FC94B995@tno.nl> <166EBB70C264A9479E459B01B1BA6C926D62FDF4@xmb-aln-x03.cisco.com> <3A7EDCDD-7C42-4D82-88DE-E81A0EB65EB5@tno.nl> <166EBB70C264A9479E459B01B1BA6C926D641A55@xmb-aln-x03.cisco.com>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From nobody Mon Nov 17 03:21:58 2014
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To: Linda Dunbar <linda.dunbar@huawei.com>
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Cc: "draft-ietf-cdni-metadata@tools.ietf.org" <draft-ietf-cdni-metadata@tools.ietf.org>, "cdni@ietf.org" <cdni@ietf.org>
Subject: Re: [CDNi] review comments to draft-ietf-cdni-metadata-08
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Linda,

My responses are inline below...

On 30 Oct 2014, at 21:05, Linda Dunbar <linda.dunbar@huawei.com> wrote:

> Ben,
> =20
> Thanks for the reply.
> =20
> More suggestions inserted below:
> =20
> -----Original Message-----
> From: Ben Niven-Jenkins [mailto:ben@niven-jenkins.co.uk]=20
> Sent: Tuesday, October 28, 2014 6:29 PM
> To: Linda Dunbar
> Cc: cdni@ietf.org; draft-ietf-cdni-metadata@tools.ietf.org
> Subject: Re: [CDNi] review comments to draft-ietf-cdni-metadata-08
> =20
> Linda,
> =20
> On 28 Oct 2014, at 20:46, Linda Dunbar <linda.dunbar@huawei.com> =
wrote:
> =20
> > Ben, Rob, Matt, and Kevin,
> >=20
> > This draft is long and defined a lot of terms: Host Index, Host =
Match, host-meta-data, Path Match, path-meta-data, =
generic-metadata-objects, etc.
> > Is the intent of the draft to define the proper data structure for =
dCDN to request content from upstream CDN?
> =20
> No. The intent is to define data structures for describing how to =
deliver content, as well as policies for where is allowed to receive it, =
etc.
> =20
> [Linda] It would make the document easier to read if you add this =
statement to the Introduction Section.

The introduction already says:
   The CDNI metadata associated with a piece of content (or with a set
   of content) provides a downstream CDN with sufficient information for
   servicing content requests on behalf of an upstream CDN in accordance
   with the policies defined by the upstream CDN.

and then says later on:
   Specifically, this document specifies:

   o  A data structure for mapping content requests and redirection
      requests to CDNI Metadata objects (Section 3 and Section 4.1).

   o  An initial set of CDNI Generic Metadata objects (Section 4.2).

   o  A RESTful web service for the transfer of CDNI Metadata
      (Section 6).

which I think covers what I say above. Can you suggest specific text =
changes you think would address your concern?
=20
> The current Abstract section says that the draft also describes the =
=93Protocol for exchange Metadata=94. I would suggest Section 5 =
(Leverage existing protocol) to simply =93Protocols for exchanging =
Metadata=94.  In the content, you can say why you need to leverage the =
existing protocols.

Section 5 doesn't talk about leveraging existing protocols. Section 2 =
mentions it as part of giving the high level design principles the =
authors tried to follow.

Section 2 already says
   Leveraging existing protocols avoids reinventing common mechanisms
   such as data structure encoding (e.g., JSON) and data transport
   (e.g., HTTP).

but that is really just background information. Section 6 specifies the =
metadata exchange protocol (the metadata interface itself) in detail.

> The details of how to obtain the content is only one part of =
describing how to deliver the content.
> =20
> > Is the following correct?
> >=20
> > host-meta-data =3D=3D =93IP addresses=94?
> =20
> host-meta-data isn't used in the document. I'm assuming you are asking =
what the value of the host-metadata property is?
> =20
> It is a link to a URI that returns a HostMetadata object which is a =
JSON object describing the default CDNI Metadata objects for content =
served from that host.
> =20
> [Linda] Is there any significance to emphasize on the =93Link to a =
URI=94 instead simple the =93URI=94?
> Do you mean the value of =93HostMetadata=94 is a link to a URI?


The value of the host-metadata property is a HostMetadata object or a =
Link object pointing to a HostMetadata object. The Link object contains =
the URI and the media type of the HostMetadata object. The Link object =
(what I refer to as "a link" in my previous e-mail) is described in =
Section 4.3.1.

Regards
Ben

> =20
> =20
> Thanks, Linda
> =20
> =20


From nobody Mon Nov 17 04:51:42 2014
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Subject: Re: [CDNi] Review of the CDNI metadata draft
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Hi Jan,

Thank you for your review, see inline for my responses to your =
individual points.

On 8 Nov 2014, at 19:12, Jan Seedorf <Jan.Seedorf@neclab.eu> wrote:

> As promised, I reviewed the -08 version of the metadata draft. Here =
are my comments:
> =20
> n  In general, the draft reads well and the concepts are =
well-described and clearly understandable (I briefly checked all the =
detailed object specifications and found no errors); the draft is in a =
very mature state and indeed seems ready for publication soon; also, the =
example in section 6 is very clear; I just have a couple of detailed =
comments below
> n  Section 1.2: it talks about capabilities (which are later on =
explained in section 5) but there is no reference to the FCI documents; =
I think you should add some text and refs on how the metadata =
capabilities relate to the CDNI FCI


The intent of Section 1.2 is to outline what is possible with the =
metadata described in the document.

If you could propose specific text you would like to see that would be =
helpful, as I'm not exactly sure what extra to write given my =
understanding of the recent agreement in the WG to not talk about FCI =
specifically but to leave that to separate document(s)?


> n  Section 5: this text needs to be revised according to the latest =
decision we have made regarding the definition of MI FCI objects being =
outside of the metadata draft; but this decision has been announced on =
the mailing list after the -08 version was published, so obviously it =
could not have been addressed

Currently Section 5 mentions that a uCDN having knowledge of what =
optional a dCDN supports might be useful and a vague reference that the =
FCI may be used to advertise such knowledge.

Section 5, as written, doesn't seem to be in conflict with the recent =
agreement in the WG regarding FCI from what I can see, unless you are =
suggesting we reference a different document to the generic CDNI =
Framework document?=20

Are there specific text changes you could propose that would address =
what you think is missing or needs re-writing?
=20
> n  Section 8 =96 Security Considerations: this section needs to be =
improved in my view; it is not very clear about the difference between =
integrity and confidentiality (e.g. talks about using encryption to =
provide integrity, but usually digital signatures or HMACs are used for =
that); also the term =93private=94 is used referring to dCDNs =
information (and not to end users), this needs to be clarified better; =
finally, among all the threats mentioned, several key ones are missing, =
such as an attacker modifying unprotected CDNI metadata in order to =
change restrictions etc. such that unauthorized end users may access =
content they are not supposed to (from the content provider perspective =
this seems to be an important threat regarding CDNI)

I'll respond to your comments above in a separate e-mail once I've had a =
chance to re-look at that section.

> n  TLS usage: from the attacker model described in section 8, it seems =
clear that TLS is strongly advised and would fulfill the security =
requirements; yet, in section 1.2 it reads like supported CDNI MI over =
TLS needs further specifications, is this true?

We discussed this at the microphone in Hawaii. The text in Section 1.2 =
is trying to outline what protocols can be supported for delivery and =
acquisition by a dCDN using the CDNI Metadata objects specified in the =
document.

It is not meant to be interpreted as a statement for whether or not to =
use TLS for securing the exchange of metadata objects across the CDNI =
Metadata interface itself.

I've tried to re-word the second half of Section 1.2 to make it clearer =
that it is talking about delivery & acquisition of content by the dCDN, =
what I have come up with is the following:

   The set of metadata specified in this document, covering the initial
   capabilities above, is only able to support CDN interconnection for
   the delivery of content by a dCDN using HTTPv1.1 and for a dCDN to be
   able to acquire content from a uCDN using either HTTPv1.1 or HTTPv1.1
   over TLS.

   Supporting CDN interconnection for the delivery of content using
   unencrypted HTTPv2.0 (as well as for a dCDN to acquire content using
   unencrypted HTTPv2.0 or HTTPv2.0 over TLS) requires the registration
   of these protocol names in the CDNI Metadata Protocol Sub-Registry.

   Supporting CDN interconnection for the delivery of content using
   HTTPv1.1 over TLS or HTTPv2.0 over TLS requires specifying additional
   metadata objects to carry the properties required to establish a TLS
   session, for example metadata to describe the certificate to use as
   part of the TLS handshake.

Does the new wording above address your comment?

Regards
Ben

> n  I found several typos, but instead of listing them here I will pass =
on my printout with the marks to the authors on-site at IETF-91
> =20
> -          Jan
> =20
> =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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Dr. Jan Seedorf
> Senior Researcher
> NEC Europe Ltd., NEC Laboratories Europe, Network Division =
Kurfuerstenanlage 36, D-69115 Heidelberg Tel.     +49 (0)6221 4342-221
> Fax:     +49 (0)6221 4342-155
> e-mail:  jan.seedorf@neclab.eu
> =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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> NEC Europe Ltd, Registered Office: Athene, Odyssey Business Park, West =
End  Road, London, HA4 6QE, GB, Registered in England 2832014
> =20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni


From nobody Mon Nov 17 09:58:55 2014
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Subject: [CDNi] Security Considerations for Metadata spec (Re: Review of the CDNI metadata draft)
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Jan,

On 8 Nov 2014, at 19:12, Jan Seedorf <Jan.Seedorf@neclab.eu> wrote:

> n  Section 8 =96 Security Considerations: this section needs to be =
improved in my view; it is not very clear about the difference between =
integrity and confidentiality (e.g. talks about using encryption to =
provide integrity, but usually digital signatures or HMACs are used for =
that); also the term =93private=94 is used referring to dCDNs =
information (and not to end users), this needs to be clarified better; =
finally, among all the threats mentioned, several key ones are missing, =
such as an attacker modifying unprotected CDNI metadata in order to =
change restrictions etc. such that unauthorized end users may access =
content they are not supposed to (from the content provider perspective =
this seems to be an important threat regarding CDNI)

Taking a look at Section 8 again and also using the Security =
Considerations section of the Logging interface as a guide, I suggest we =
re-write Section 8 of the Metadata specification to be much more inline =
with section 7 & in particular section 7.1 of the logging interface:
http://tools.ietf.org/html/draft-ietf-cdni-logging-13#page-46

I think basing off sections 7/7.1 would give us a good general =
description and then we can include specific issues that may occur if =
for e.g. mutual authentication or message integrity are not used, if you =
think that is also required?

Similarly fir privacy, some of the general text in Section 7.3 of the =
logging draft looks a good base to reuse and then we can talk a little =
about the fact that metadata contains content provider policy and other =
configuration they may not want exposed.

If the outline above sounds like it is on the right path to addressing =
your comments, I'll work with my co-authors to produce some proposed =
text we can review with you further.

Ben




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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Subject: Re: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Tue, 18 Nov 2014 21:16:40 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From: Xinwang <xin.huawei.wang@huawei.com>
To: "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: Liaison Statement on URI Signing for MPEG-DASH
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Date: Wed, 19 Nov 2014 05:26:17 +0000
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--_000_338D2A5749A11545BFB2D09A333491BE1808B4B8SJCEML701CHMchi_
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Hi everyone,

This is  Xin Wang. I just managed to join this reflector (thanks to Ray Bra=
ndenburg's encouragement). I am one of the coordinators of the URI Signing =
Core Experiment (CE) at MPEG DASH - the other is Emmanuel Thomas from TNO; =
we drafted the liaison statement on URI signing from MPEG DASH to IETF CDNi=
.

Lately, I have been monitoring this thread in the reflector archive, and se=
e a few questions and issues that I may be able to help clarifying.

Let me start with the latest one on whether the DASH manifest MPD contains =
absolute URLs for segments. In general, MPD supports listing all absolute U=
RLs, but also provides more compact forms, URL templates, to allow the DASH=
 client to construct absolute URLs for requesting segments; namely, a URL t=
emplate is a URL containing some specific identifiers that can be substitut=
ed by dynamic values assigned to segments to create a list of segment URLs.=
 For example, the following URL template

http://cdn1.example.com/aMovie/video/$Number$.mp4v

has an identifier $Number$ that can be substituted by actual segment number=
s (by the DASH client), to create a list (or range) of segment URLs, like

http://cdn1.example.com/aMovie/video/1.mp4v
http://cdn1.example.com/aMovie/video/2.mp4v
...

Clearly, this kind of URL templates have their advantages over listing abso=
lute URLs, especially when dealing with long or live content (where listing=
 all absolute URLs in advance is either inefficient or not feasible).

So, when coming to URI signing, we also need to consider how to deal with t=
he URL template case.

This is long enough for my first post to this reflector, so I stop here tod=
ay. I look forward to working with you all on this URI signing task.

Best,

-- Xin

--_000_338D2A5749A11545BFB2D09A333491BE1808B4B8SJCEML701CHMchi_
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi everyone,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This is&nbsp; Xin Wang. I just managed to join this =
reflector (thanks to Ray Brandenburg&#8217;s encouragement). I am one of th=
e coordinators of the URI Signing Core Experiment (CE) at MPEG DASH &#8211;=
 the other is Emmanuel Thomas from TNO; we drafted
 the liaison statement on URI signing from MPEG DASH to IETF CDNi. <o:p></o=
:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Lately, I have been monitoring this thread in the re=
flector archive, and see a few questions and issues that I may be able to h=
elp clarifying.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Let me start with the latest one on whether the DASH=
 manifest MPD contains absolute URLs for segments. In general, MPD supports=
 listing all absolute URLs, but also provides more compact forms, URL templ=
ates, to allow the DASH client to
 construct absolute URLs for requesting segments; namely, a URL template is=
 a URL containing some specific identifiers that can be
<span lang=3D"EN-GB">substituted by dynamic values assigned to segments to =
create a list of segment URLs. For example, the following URL template<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"font-size:8.0pt;font-f=
amily:&quot;Courier New&quot;;color:black"><a href=3D"http://cdn1.example.c=
om/aMovie/video/$Number$.mp4v">http://cdn1.example.com/aMovie/video/$Number=
$.mp4v</a>
</span><span lang=3D"EN-GB"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">has an identifier $Number$ that can be substituted b=
y actual segment numbers (by the DASH client), to create a list (or range) =
of segment URLs, like<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"font-size:8.0pt;font-f=
amily:&quot;Courier New&quot;;color:black"><a href=3D"http://cdn1.example.c=
om/aMovie/video/1.mp4v">http://cdn1.example.com/aMovie/video/1.mp4v</a>
</span><span lang=3D"EN-GB"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"font-size:8.0pt;font-f=
amily:&quot;Courier New&quot;;color:black"><a href=3D"http://cdn1.example.c=
om/aMovie/video/2.mp4v">http://cdn1.example.com/aMovie/video/2.mp4v</a>
</span><span lang=3D"EN-GB"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">&#8230;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">Clearly, this kind of URL templates have their advan=
tages over listing absolute URLs, especially when dealing with long or live=
 content (where listing all absolute URLs in advance is either inefficient =
or not feasible).
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">So, when coming to URI signing, we also need to cons=
ider how to deal with the URL template case.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This is long enough for my first post to this reflec=
tor, so I stop here today. I look forward to working with you all on this U=
RI signing task.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Best,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">-- Xin<o:p></o:p></p>
</div>
</body>
</html>

--_000_338D2A5749A11545BFB2D09A333491BE1808B4B8SJCEML701CHMchi_--


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From: <mal.hubert@bt.com>
To: <mcaulfie@cisco.com>, <flefauch@cisco.com>
Date: Wed, 19 Nov 2014 10:02:11 +0000
Thread-Topic: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Subject: Re: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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From nobody Wed Nov 19 06:35:34 2014
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Wed, 19 Nov 2014 14:35:22 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "mal.hubert@bt.com" <mal.hubert@bt.com>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Date: Wed, 19 Nov 2014 15:29:17 +0000
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Subject: Re: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Date: Wed, 19 Nov 2014 16:04:22 +0000
Thread-Topic: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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From: "Flinck, Hannu (NSN - FI/Espoo)" <hannu.flinck@nsn.com>
To: "ext mal.hubert@bt.com" <mal.hubert@bt.com>, "mcaulfie@cisco.com" <mcaulfie@cisco.com>, "flefauch@cisco.com" <flefauch@cisco.com>
Thread-Topic: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Subject: Re: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "Flinck, Hannu (NSN - FI/Espoo)" <hannu.flinck@nsn.com>, "ext mal.hubert@bt.com" <mal.hubert@bt.com>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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Subject: Re: [CDNi] New Version Notification for draft-caulfield-cdni-rate-pacing-02.txt
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From: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
Thread-Index: AQHP/gWZcjC4WeJbFUStxfdC8RpP1JxePdmAgABL0wCAAJm0gIABI9xwgAMBhYCAAQvfwIAAth8AgAHg72CAAYj1AP//qtLg
Date: Wed, 19 Nov 2014 16:25:04 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From nobody Thu Nov 20 01:43:38 2014
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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Thu, 20 Nov 2014 09:43:30 +0000
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From: "Flinck, Hannu (NSN - FI/Espoo)" <hannu.flinck@nsn.com>
To: "ext Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, "ext mal.hubert@bt.com" <mal.hubert@bt.com>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
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From: Kevin Ma J <kevin.j.ma@ericsson.com>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>, "Matt Caulfield (mcaulfie)" <mcaulfie@cisco.com>, Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From nobody Thu Nov 20 15:50:34 2014
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <E3479D38-1AB8-40E7-8D52-77D1FC94B995@tno.nl> <166EBB70C264A9479E459B01B1BA6C926D62FDF4@xmb-aln-x03.cisco.com> <3A7EDCDD-7C42-4D82-88DE-E81A0EB65EB5@tno.nl> <166EBB70C264A9479E459B01B1BA6C926D641A55@xmb-aln-x03.cisco.com> <FCC100FC8D6B034CB88CD8173B2DA1582029F8C4@EXC-MBX03.tsn.tno.nl>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Ray,

I haven't caught up with the whole thread yet, but wanted to respond to =
a couple things you say below.

On 17 Nov 2014, at 10:27, Brandenburg, R. (Ray) van =
<ray.vanbrandenburg@tno.nl> wrote:

> From: Matt Caulfield (mcaulfie) [mailto:mcaulfie@cisco.com]=20
>> From: Brandenburg, R. (Ray) van [mailto:ray.vanbrandenburg@tno.nl]I =
don=92t necessarily think this method is superior to the Cookie-method.
>> Both have their pros and cons. The problem with the Cookie method is=20=

>> that it doesn=92t work when the manifest is served by the Content=20
>> Provider (which can be quite a common case). The problem with the=20
>> header-query-string method is that it only works for DASH clients, =
and=20
>> not for standard HLS clients.
>=20
> In the case where the manifest is served by the Content Provider and =
the segments are served by the CDN, wouldn't the MPD need to contain =
absolute URLs? Meaning that segment URLs would go through regular =
request routing and URI signing?
>=20
> [Ray] Yes, it would contain absolute URLs. It would be possible for =
the CSP to sign these URLs, however, that would mean signing them with =
an expiration time of at least the length of the content item.

Isn't that the same for the case where both the manifest & content is =
served by the dCDN? The Content Provider only gets one chance to sign a =
cookie in that case too?

I also don't understand why the Content Provider delivering the manifest =
and the dCDN delivering the content results in the Content Provider =
having to sign the individual URLs in the manifest.

AFAIK (I haven't tested it), the Content Provider can deliver the =
manifest from manifest.video.example.com and deliver the content via the =
uCDN/dCDN by using URLs pointing to chunks.video.example.com and share =
cookies across the domains by setting the token in a cookie with a =
Domain attribute of ".video.example.com".

Alternatively the Content Provider could use CORS to enable cookie =
sharing across domains.

> For an MPD of a 90min movie, that would mean expiration times of at =
least 90mins, which would reduce, if not negate altogether, the =
effectiveness of signing the URLs in the first place.

There are other approaches to avoid long expiration times, e.g defining =
the semantics of the token so that it expiration applies to TCP =
connection setup and so multiple requests are allowed on a persistent =
connection past the expiration time of the token.=20

Ben=


From nobody Sat Nov 22 10:35:49 2014
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Date: Sat, 22 Nov 2014 18:35:40 +0000
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <E3479D38-1AB8-40E7-8D52-77D1FC94B995@tno.nl> <23B35B9C-2060-4FD6-9B2C-7D1E615CCCAD@niven-jenkins.co.uk> <6E6846B6-2902-4C31-8119-5AF5E5FA9F24@tno.nl>
To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
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Subject: Re: [CDNi] Authorisation tokens (was Re: Liaison Statement on URI Signing for MPEG-DASH)
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Ray,

On 14 Nov 2014, at 07:33, Brandenburg, R. (Ray) van =
<ray.vanbrandenburg@tno.nl> wrote:

> Hi Ben,
>=20
> On 14/11/14 03:42, "Ben Niven-Jenkins" <ben@niven-jenkins.co.uk> =
wrote:
>=20
>> Ray, Colleagues,
>>=20
>> I think what you're suggesting here is changing the scope of the =
document=20
>> from how to sign a particular URL to describing how to mint (& =
possibly=20
>> present) an "authorisation token" that authorises the client the be =
able=20
>> to retrieve the content from 1 or more URLs.
>=20
> I think it depends on your definition. Effectively, the method of =
signing=20
> a particular URL and =91minting=92 a token are quite similar. The only=20=

> difference is that one is placed in the query string of the =
redirection=20
> URL, and the other is placed in the Set-Cookie field of a returned 200 =
OK.=20

Agreed. In my mind both are authorisation tokens, the method they are =
presented differs (query string vs cookie) and the scope differs (single =
URL vs >1 URL).

Ben


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From: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
To: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
Thread-Topic: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Date: Mon, 24 Nov 2014 08:29:18 +0000
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References: <EC00C70E-C176-455B-8FE0-28A359C05A72@cisco.com> <4C639B2E-E1B8-4B42-8F76-D98697E7CE5D@niven-jenkins.co.uk> <60396378-BBFF-4926-8141-990141163B1E@tno.nl> <E3479D38-1AB8-40E7-8D52-77D1FC94B995@tno.nl> <166EBB70C264A9479E459B01B1BA6C926D62FDF4@xmb-aln-x03.cisco.com> <3A7EDCDD-7C42-4D82-88DE-E81A0EB65EB5@tno.nl> <166EBB70C264A9479E459B01B1BA6C926D641A55@xmb-aln-x03.cisco.com> <FCC100FC8D6B034CB88CD8173B2DA1582029F8C4@EXC-MBX03.tsn.tno.nl> <BF9B6C96-E8BA-4ABA-AC58-76A673232BB3@niven-jenkins.co.uk>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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From: "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
To: "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: Draft Minutes uploaded for IETF-91 CDNI WG Meeting 
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Hello,

Draft minutes have been uploaded:
http://www.ietf.org/proceedings/91/minutes/minutes-91-cdni

Please pass on any comments/corrections.

Happy Thanksgiving for those living in North America.

Francois & Daryl

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e-break: after-white-space;" class=3D"">
<div class=3D"">Hello,</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Draft minutes have been uploaded:</div>
<div class=3D""><a href=3D"http://www.ietf.org/proceedings/91/minutes/minut=
es-91-cdni" class=3D"">http://www.ietf.org/proceedings/91/minutes/minutes-9=
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<div class=3D"">Please pass on any comments/corrections.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Happy Thanksgiving for those living in North America.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Francois &amp; Daryl</div>
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--_000_03247379C0F04F5EAD06996C891873D1ciscocom_--


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From: "Francois Le Faucheur (flefauch)" <flefauch@cisco.com>
To: "draft-ietf-cdni-redirection@tools.ietf.org" <draft-ietf-cdni-redirection@tools.ietf.org>
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From nobody Fri Nov 28 14:33:35 2014
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From: Kevin Ma J <kevin.j.ma@ericsson.com>
To: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>, "cdni@ietf.org" <cdni@ietf.org>
Thread-Topic: [CDNi] I-D Action: draft-ietf-cdni-redirection-05.txt
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Subject: Re: [CDNi] I-D Action: draft-ietf-cdni-redirection-05.txt
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Hi Ben/Ray,

  Per the chairs' request, I've reviewed the latest doc; comments/questions=
 below.

thanx.

--  Kevin J. Ma

General:

- There is a lot of mixed use of "Upstream CDN" vs. "uCDN" and
  "Downstream CDN" vs. "dCDN".  To make the document consistent,
  I would change all instances of the former to the latter.

- There is inconsistent use of "a RI" vs. "an RI".  The latter seems
  more natural to me, but it would be good to make it consistent.

- There are a number of places where commas might help readability,
  e.g., "For example " -> "For example, ", "i.e." -> "i.e.,", "e.g." -> "e.=
g.,"

- There are a number of somewhat long sentences that could be broken up
  or punctuated for readability, e.g.:

  "For example, a dCDN may know that it will always select
   the same Surrogates for a given set of User Agent IP addresses and in
   order to reduce request volume across the RI or to remove the
   additional latency associated with an RI request, the dCDN may wish
   to indicate that set of User Agent IP addresses to the uCDN in the
   initial RI response."

  to something like:

  "For example, a dCDN may know that it will always select
   the same Surrogates for a given set of User Agent IP addresses; in
   order to reduce request volume across the RI, or to remove the
   additional latency associated with an RI request, the dCDN may wish
   to indicate that set of User Agent IP addresses to the uCDN, in the
   initial RI response."

Section 3:

- RI is necessary for recursive redirection, but interconnection could
  still occur with interactive redirection?  Might want to rephrase this:

    "main building blocks required in order to interconnect"

- I would split this into a second sentence starting with "Depending"=20

    "and depending on the returned Redirection Target"

- "in dCDN or another CDN" -> "in the dCDN or another CDN"

- I think that this:

  "that will be using a
   redirection protocol (DNS or HTTP) which may or may not be the
   same as the original redirection protocol."

  is trying to say the following:

  "that may use a different redirection protocol (DNS or HTTP)
   than the one specified in the RI request."

  Is that the only time the RI would ever point to a request router?

- this can be simplified:

  "To enable communication
   over the Redirection Interface, the two interconnected CDNs need to
   know the end point (URI) in the other CDN to query.  For example, an
   Upstream CDN needs to know the URI (end point) in a Downstream CDN to
   send its CDNI request routing queries to."

  to this:

  "To enable communication
   over the Redirection Interface, the uCDN needs to know the URI (end
   point) in the dCDN to which it may CDNI send request routing queries."

- "CDNI control interface" -> "CDNI Control interface"

- Is the following statement true?  I thought the idea of advertising
  support for redirection mode was so that a given CDN did not have to
  support both mechanisms?

  "CDNI solutions are required to support both of the request routing
   mechanisms illustrated in section 2.1 of [RFC7336], namely Iterative
   Request Redirection and Recursive Request Redirection."

  When using the RI, it doesn't matter if the dCDNs support either;
  they could support neither.  As long as the uCDN supported one, the
  other, or both, and the dCDNs returned surrogate addresses over the
  RI, then, it should just work?

- I think this can be simplified:

  "Therefore, the Redirection Interface is only relevant in the case of
   Recursive Request Redirection and so this document will not discuss
   Iterative Request Redirection further."

  to say:

  "This document will therefore only focus on Recursive Request Redirection=
."

- "it is down to the uCDN" -> "it is up to the uCDN"

- "or otherwise reject the" -> "or otherwise rejects the"

- "However the Redirection Interface" -> "However. the RI"

- I think it would be useful to list the actual requirements
  (i assume this is referring to GEN-11 and RI-5) and
  possibly have a reference to the requirements RFC7337.

  "Also, according to the CDNI generic and request routing interface
   requirements, the CDNI solution shall support mechanisms to prevent
   and detect RI request loops"
=20
  e.g.:

  "CDNI requirements GEN-11 and RI-5 [RFC7337] specify that=20
   the CDNI solution shall support mechanisms to prevent
   and detect RI request loops"

Section 4:

- "for brevity, only" -> "for brevity; only"

- "either DNS request or HTTP request" -> "either DNS or HTTP"
  "it recognizes" -> "recognizes"
  "or that CDN B is one" -> "CDN B may be one"

- "is well formed, etc." -> "is well formed,"

Section 4.1:

- "ought to" -> "SHOULD" ?

- Could add subsections to separate request and response text.

- "return additional policy to" -> "return additional policy information to=
"
  "the Upstream CDN to help the Upstream CDN" -> "the uCDN to help it"

- This is a little confusing as to whether the indication is in the
  HTTP header or if the response is in the HTTP header.  I assume we
  mean the former, so perhaps rearranging this:

  "An indication of the cacheability of the response carried in the
   HTTP response headers

  to something like this:

  "Cacheability indicators signaled via HTTP response headers"

  Similarly, this:

  "The scope of the response (if it is cacheable) carried within the
   body of the HTTP response."

  could be changes to something like this:

  "The scope signaled in the HTTP response body."

  Might want to add a reference to Section 4.8.

- Is the scope only signaled when the response cacheable?
  Is the scope only allowed to be signaled when the response is cacheable?
  The scope only really makes sense when it's cacheable, but is it an
  error to send a scope if the response is not cacheable?

Section 4.2:

- This might be clearer if directed specifically at the table:

  "The following top level keys are defined along with whether they are
   applicable to RI requests, RI responses or to both RI requests and
   responses:"

  maybe something like:

  "The following table defines the top level keys, along with whether
   they are applicable to RI requests, RI responses, or both:"

  The table itself might be easier to understand, however, if it was
  split into two separate tables, one for request keys and another for
  response keys, rather than having to parse the description text.

- In the table, cdn-path is listed as "Both", however, the description
  talks about "this request".  Presumably, the list is present in the
  response, containing the final list of CDN Provider IDs as known to
  the respondent, associated with the request to which it is
  responding?  Might want to make that more explicit.

- "crudely" -> "coarsely"

- Though the cdn-path MAY be reflected back, are the transit CDNs
  allowed to remove themselves (and all further dCDNs) from the chain
  as they respond, or are they required to maintain the full chain, if
  they choose to include cdn-path in the response.

  Similarly, is any CDN in the chain allowed to remove cdn-path from
  the response, even if further downstream CDNs have included it
  (i.e., the ultimate CDN decided to reflect)?

Section 4.4.1:

- What is the use case for the dns-only flag?  Is it intended to
  improve delivery performance?  Would it be configured by the
  content owner to enforce request routing properties?

- If dns-only is set to true, and the transit CDN does not support DNS
  redirection, is it always safe to propagate the request (assuming
  the hop count and loop detection don't error out)?  Presumably there
  is eventually either a dCDN that supports DNS or an error?

  It's not clear to me how this flag should be used (see also
  questions on next section)?  If the authoritative CDN is returning
  the DNS resolution to the UA, but the address provided by the dCDN
  is a CNAME, does the dCDN have to honor that flag in subsequent DNS
  queries to the dCDN?

Section 4.4.2:

- These might be clearer with the surrogate/request router as the object:

  "o  The IP address(es) of (or the CNAME of) the RT (if the dCDN is
      performing DNS based redirection directly to a surrogate); or

   o  The IP address(es) of (or the CNAME of) a RT which is a Request
      Router (if the dCDN is performing HTTP based redirection)."

  maybe something like:

  "o  The IP address(es) of (or the CNAME of) the dCDN surrogate as
      the RT (if the dCDN is allowing the uCDN to perform DNS redirection);=
 or

   o  The IP address(es) of (or the CNAME of) the dCDN request router
      as the RT (if the dCDN will perform request redirection itself)."

- If the dCDN returned a CNAME to be resolved by its request router,
  could the dCDN at that point choose to do either DNS or HTTP
  redirection, or is the dCDN, at the time of the RI request,
  promising not to do HTTP redirection when resolving the CNAME?

  "o  The IP address(es) of (or the CNAME of) a RT which is a Request
      Router (if the dCDN is performing HTTP based redirection).  A dCDN
      MUST NOT return a RT which is a Request Router if the dns-only key
      is set to True in the RI request."

- Can we add the units for "ttl" to the description?  Should be seconds?

  This is the TTL for the DNS response?  Is there an implied scope for
  the RI response?  Should the uCDN not try to glean anything from it?
  Either way, we might want to explicitly state whether or not the
  uCDN can use that information (especially if the information
  conflicts with the scope information in the HTTP response headers of
  the RI response).

Section 4.5.1:

- For "cs-uri", is this the RFC2616 Request-URI from the HTTP request,
  or is this the RFC7230 Effective Request URI?  Could/Should/Would
  the uCDN ever transform the URI to make it understandable to the dCDN?

- "User Agent's DNS query/request." -> "User Agent's HTTP request."

Section 4.5.2:

- I think this is confusing because the dCDN is not performing HTTP
  redirection so much as it is allowing the uCDN to perform HTTP
  redirection; the dCDN is just responding to the RI request?

  "o  A URL pointing to the selected RT (if the dCDN is performing HTTP
      based redirection directly to a surrogate); or"

  Perhaps it would be more clear with something like:

  "o  A URL pointing to the selected surrogate as the RT (if the dCDN
      is allowing the uCDN to directly address the surrogate); or"

  If the dCDN returns a URL with a DNS name rather than an IP address,
  then the dCDN may still do DNS redirection?  There's no way to tell
  from the URL returned via the RI whether the dCDN is doing any
  further redirection (DNS or HTTP)?

- This could be modified like the one in 4.4.2:

  "o  A URL pointing to a RT which is a Request Router (if the dCDN is
      not redirecting the User Agent directly to a surrogate)."

  to something like:

  "o  The IP address(es) of the dCDN request router
      as the RT (if the dCDN will perform request redirection itself)."

- Why is there a special case for "sc(cache-control)" in the table?
  It is not mandatory and already covered by "sc(<headername>)"?

  This is the cacheability of the HTTP response.  Is there an implied
  scope for the RI response?  Should the uCDN not try to glean
  anything from it?  Either way, we might want to explicitly state
  whether or not the uCDN can use that information (especially if the
  information conflicts with the scope information in the HTTP
  response headers of the RI response).

- "some or all" -> "any or all"

Section 4.6:

- "except for the c-ip field" -> "except for the c-ip field,"

Section 4.7:

- "for a dCDN not being able" -> "for a dCDN to be unable"

- "diagnostics of issues" -> "diagnosis of issues"

- "The resolution of such issues is outside the scope of this
   document and this document therefore does not specify the consequent
   actions a uCDN should take upon receiving a particular error code." ->

  "The resolution of such issues is outside the scope of this
   document; this document does not specify any consequent
   actions a uCDN should take upon receiving a particular error code."

- Are error-codes generally vendor implementation/deployment dependent?

  "A three-digit numeric code defined by the server"

  Should there be a registry for all error codes?
  If the registry is mandatory, and/or if conflicts are disallowed,
  might want to note that.  If we are allowing vendors to define
  overlapping error codes at will, is it just left up to the uCDN to
  figure out what to do with them?

- Depending on the answer to the dns-only question above, should there
  also be an error code for "dCDN does not support DNS redirection and
  does not want to give a surrogate address and dns-only set to true"?
  Would that just be a 500?

- Is it valid for the dCDN to set the Cache-Control header for an
  error response, e.g., out of capacity for the next 20 min?

- Is it necessary to have both of these requirements?  If the transit
  CDNs never forward to looped dCDNs, the dCDNs should never be able
  to detect a loop (assuming a uCDN doesn't sent to itself)?

  "When receiving RI requests a dCDN MUST check
   the cdn-path and reject any RI requests which already contain the
   downstream CDN's Provider ID in the cdn-path.  Transit CDNs MUST
   check the cdn-path and not cascade the RI request to downstream CDNs
   that are already listed in cdn-path."

  I don't see any harm in listing both checks, just to be safe, but I
  didn't know if I was missing something?

- Why aren't the 502 and 503 errors a MUST?

  "If a downstream CDN receives a RI request whose cdn-path already
   contains that downstream CDN's Provider ID the downstream CDN SHOULD
   send a RI response with an error code of 502."

  "If a downstream CDN receives a RI request where the number of CDN
   Provider IDs in cdn-path is greater than max-hops, the downstream CDN
   SHOULD send a RI response with an error code of 503."

- "As well as loops with the RI itself, there" -> "There"

Section 5:

- Should we make TLS a MUST?  Using similar text to the triggers draft?

> -----Original Message-----
> From: CDNi [mailto:cdni-bounces@ietf.org] On Behalf Of Ben Niven-Jenkins
> Sent: Monday, November 10, 2014 6:41 PM
> To: cdni@ietf.org
> Subject: Re: [CDNi] I-D Action: draft-ietf-cdni-redirection-05.txt
>=20
> Colleagues,
>=20
> This update just contains a small number of editorial changes the editors
> noticed when preparing for IETF91.
>=20
> Regards
> Ben
>=20
> On 10 Nov 2014, at 23:39, internet-drafts@ietf.org wrote:
>=20
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> > This draft is a work item of the Content Delivery Networks Interconnect=
ion
> Working Group of the IETF.
> >
> >        Title           : Request Routing Redirection Interface for CDN
> Interconnection
> >        Authors         : Ben Niven-Jenkins
> >                          Ray van Brandenburg
> > 	Filename        : draft-ietf-cdni-redirection-05.txt
> > 	Pages           : 29
> > 	Date            : 2014-11-10
> >
> > Abstract:
> >   The Request Routing Interface comprises of (1) the asynchronous
> >   advertisement of footprint and capabilities by a downstream CDN that
> >   allows a upstream CDN to decide whether to redirect particular user
> >   requests to that downstream CDN; and (2) the synchronous operation of
> >   an upstream CDN requesting whether a downstream CDN is prepared to
> >   accept a user request and of a downstream CDN responding with how to
> >   actually redirect the user request.  This document describes an
> >   interface for the latter part, i.e. the CDNI Request Routing
> >   Redirection interface.
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-cdni-redirection/
> >
> > There's also a htmlized version available at:
> > http://tools.ietf.org/html/draft-ietf-cdni-redirection-05
> >
> > A diff from the previous version is available at:
> > http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-cdni-redirection-05
> >
> >
> > 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/
> >
> > _______________________________________________
> > CDNi mailing list
> > CDNi@ietf.org
> > https://www.ietf.org/mailman/listinfo/cdni
>=20
> _______________________________________________
> CDNi mailing list
> CDNi@ietf.org
> https://www.ietf.org/mailman/listinfo/cdni


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<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In Honolulu, I volunteered to review draft-ietf-cdni=
-redirection-05. I have done this, and think the draft is in good shape, an=
d technically quite sound. Below follow more detailed comments.<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Best regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Bert<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">---<o:p></o:p></p>
<p class=3D"MsoNormal">(BG1) In section 4.2: &quot;The cdn-path MAY be refl=
ected back in RI responses, although doing so would expose information to t=
he uCDN that a dCDN may not wish to expose (for example, the existence of b=
usiness relationships between a dCDN and
 other CDNs).&quot; The information in the cdn-path can be forwarded from a=
 dCDN to another dCDN though. Why is it not a problem that the second dCDN =
acquires such information from the first?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG2) In section 4.4.1, the bullet list specifies fi=
ve information points that need to be passed from the uCDN to the dCDN. The=
 IP address or prefix of the UA is also listed, but in the following table,=
 the related field &quot;c-subnet&quot; is not
 mandatory. Why is it not mandatory?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG3) Related to (BG2): It seems better to combine t=
he text &quot;This dns dictionary MUST contain the following keys: resolver=
-ip, qtype, qclass, qname and the value of each MUST be the value of the ap=
propriate part of the User Agent's DNS
 query/request&quot; with the bullet list at the start of section 4.4.1, as=
 the information seems to be double. This comment also applies to section 4=
.5.1.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG4) In section 4.4.2: &quot;The dns dictionary MAY=
 include both 'a' and 'aaaa' keys. If the dns dictionary contains a cname k=
ey it MUST NOT contain either an a or aaaa key.&quot; Why? It makes sense t=
o not do a DNS lookup for a cname if the related
 IP address is already available in the response, but why mandate the absen=
ce of cname in that case?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG5) Do the 'a' and 'aaaa' fields point at the same=
 RTs?&nbsp; (I notice in the examples that the number of elements in the 'a=
' and 'aaaa' fields are equal, which may mean that for each element in a th=
ere is a related element in 'aaaa'.) I
 guess this is not the case, but want to make sure.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG6) Table in section 4.5.1: &quot;cs-uri&quot;, &q=
uot;The URI requested by the UA&quot;. This URI is called URL elsewhere. Un=
ify the wording.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG7) Section 4.5.1: &quot;In the case where the Use=
r Agent request includes multiple HTTP header fields with the same field-na=
me, it is up to the uCDN to determine how to handle this. One option would =
be to only send the contents of the first
 occurrence of that HTTP Header in the User Agent Request. Another would be=
 to combine the different HTTP Headers into a single value according to Sec=
tion 3.2.2 of [RFC7230].&quot; The text in RFC 7230 says that such combined=
 header field is semantically equivalent
 to the separated headers fields. However, here we allow different handling=
 for such equivalent encodings. Maybe we should mandate that the Headers ne=
ed to be combined into a single value, or at least use a SHOULD?<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG8) In sections 4.5.1 and 4.5.2, there is mentioni=
ng of the keys &quot;sc(&lt;headername&gt;)&quot; and &quot;cs(&lt;headerna=
me&gt;)&quot;. Are these the same? If so, use a single key. If not, explain=
 their difference. (Maybe this has something to do with the direction
 server-&gt;client, client-&gt;server.)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG9) Related to (BG8): in the last line on page 16,=
 should &quot;cs(&lt;headername&gt;)&quot; be &quot;sc(&lt;headername&gt;)&=
quot;?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG10) I propose to modify first sentence in section=
 4.6, &quot;RI responses may be cacheable and may be reused by the uCDN in =
response to User Agent requests without the uCDN issuing another RI request=
 to the dCDN if the RI response is considered
 cachable &amp; not stale according to the standard HTTP Cache-Control, etc=
 mechanisms.&quot; as follows: &quot;RI responses may be cacheable. As long=
 as a cached RI response is not stale according to standard HTTP Cache-Cont=
rol or other applicable mechanisms, it may be
 reused by the uCDN in response to User Agent requests without sending anot=
her RI request to the dCDN.&quot;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG11) Section 4.6 contains the following text: &quo=
t;(except for the c-ip field provided the User Agent's c-ip is covered by t=
he scope in the original RI response)&quot;. The scope dictionary (&quot;ip=
range&quot;) is only defined later, making the sentence
 confusing. Maybe reword as follows: &quot;(except for the c-ip field provi=
ded that the User Agent's c-ip is covered by the scope in the original RI r=
esponse, as elaborated upon below)&quot;.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG12) The second example on page 9 in has two &quot=
;max-age&quot; fields: one in the header (&quot;max-age=3D60&quot;) and one=
 in the body (&quot;max-age=3D30&quot;). The former must be meant for the u=
CDN, whereas the latter is meant for the UA. Maybe it would be good
 to add the following text after &quot;Example of HTTP redirection response=
 from Section 4.5.2 that is cacheable by the uCDN for 60 seconds and can be=
 returned to any User Agent with an IPv4 address in 198.51.100.0/24.&quot;:=
 &quot;Notice that the response to the UA is only
 valid for 30 seconds, whereas the uCDN can cache the RI response for 60 se=
conds.&quot;
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG13) In the second table in section 4.7, on page 2=
2, there is the text &quot;&lt;reason&gt;&quot; for codes 100, 400, and 500=
. From the IANA considerations section, it later becomes clear that this &q=
uot;&lt;reason&gt;&quot; is actually the value of the &quot;reason&quot; st=
ring
 in the error information. However, that is not clear from the table. I thi=
nk it would be good to clarify this already in section 4.7.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">(BG14) In section 4.8, there is the following text (=
A) about the max-hops value: &quot;Transit CDNs MUST NOT propagate to any d=
ownstream CDNs if the number of CDN Provider IDs in cdn-path is equal to or=
 greater than max-hops.&quot; In addition, there
 is the text (B): &quot;If a downstream CDN receives a RI request where the=
 number of CDN Provider IDs in cdn-path is greater than max-hops, the downs=
tream CDN SHOULD send a RI response with an error code of 503.&quot;. Text =
(B) seems to indicate that the values of max-hops
 / cdn-path are checked upon receipt of the message, not before sending it.=
 Thus, if max-hops =3D 1, the first dCDN can propagate the RI request, but =
the second cannot. That means that in text (A), the cdn-path is evaluated _=
before_ the dCDN adds its own Provider
 ID. I propose to write this explicitly, and thus rephrase (A) as follows: =
&quot;Transit CDNs MUST NOT propagate to any downstream CDNs if the number =
of CDN Provider IDs in cdn-path (before adding its own Provider ID) is equa=
l to or greater than max-hops.&quot;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center"><span=
 style=3D"font-size:10.0pt">
<hr size=3D"2" width=3D"100%" align=3D"center">
</span></div>
<p class=3D"MsoNormal">Bert Greevenbosch<o:p></o:p></p>
<p class=3D"MsoNormal">Huawei Technologies Co., Ltd.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">bert.greevenbosch@huawei.com<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Huawei Industrial Base F1-8<o:p></o:p></p>
<p class=3D"MsoNormal">Bantian, Longgang District<o:p></o:p></p>
<p class=3D"MsoNormal">Shenzhen 518129<o:p></o:p></p>
<p class=3D"MsoNormal">P.R. China<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">http://www.huawei.com<o:p></o:p></p>
<div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center"><span=
 style=3D"font-size:10.0pt">
<hr size=3D"2" width=3D"100%" align=3D"center">
</span></div>
<p class=3D"MsoNormal"><span lang=3D"ZH-CN" style=3D"font-size:7.5pt;font-f=
amily:=BB=AA=CE=C4=CF=B8=BA=DA;color:gray">=B1=BE=D3=CA=BC=FE=BC=B0=C6=E4=
=B8=BD=BC=FE=BA=AC=D3=D0=BB=AA=CE=AA=B9=AB=CB=BE=B5=C4=B1=A3=C3=DC=D0=C5=CF=
=A2=A3=AC=BD=F6=CF=DE=D3=DA=B7=A2=CB=CD=B8=F8=C9=CF=C3=E6=B5=D8=D6=B7=D6=D0=
=C1=D0=B3=F6=B5=C4=B8=F6=C8=CB=BB=F2=C8=BA=D7=E9=A1=A3=BD=FB</span><span st=
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=B7=A2=A3=A9=B1=BE=D3=CA=BC=FE=D6=D0</span><br>
<span lang=3D"ZH-CN">=B5=C4=D0=C5=CF=A2=A1=A3=C8=E7=B9=FB=C4=FA=B4=ED=CA=D5=
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From nobody Sun Nov 30 06:54:08 2014
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To: "Brandenburg, R. (Ray) van" <ray.vanbrandenburg@tno.nl>
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Subject: Re: [CDNi] Liaison Statement on URI Signing for MPEG-DASH
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Ray,

See inline...

On 24 Nov 2014, at 08:29, Brandenburg, R. (Ray) van =
<ray.vanbrandenburg@tno.nl> wrote:

> On 20/11/14 23:50, "Ben Niven-Jenkins" <ben@niven-jenkins.co.uk> =
wrote:
>=20
>> Ray,
>>=20
>> I haven't caught up with the whole thread yet, but wanted to respond =
to a=20
>> couple things you say below.
>>=20
>> On 17 Nov 2014, at 10:27, Brandenburg, R. (Ray) van=20
>> <ray.vanbrandenburg@tno.nl> wrote:
>>=20
>>> From: Matt Caulfield (mcaulfie) [mailto:mcaulfie@cisco.com]=20
>>>> From: Brandenburg, R. (Ray) van [mailto:ray.vanbrandenburg@tno.nl]I=20=

>>>> don=92t necessarily think this method is superior to the =
Cookie-method.
>>>> Both have their pros and cons. The problem with the Cookie method =
is=20
>>>> that it doesn=92t work when the manifest is served by the Content=20=

>>>> Provider (which can be quite a common case). The problem with the=20=

>>>> header-query-string method is that it only works for DASH clients, =
and=20
>>>> not for standard HLS clients.
>>>=20
>>> In the case where the manifest is served by the Content Provider and=20=

>>> the segments are served by the CDN, wouldn't the MPD need to contain=20=

>>> absolute URLs? Meaning that segment URLs would go through regular=20
>>> request routing and URI signing?
>>>=20
>>> [Ray] Yes, it would contain absolute URLs. It would be possible for =
the=20
>>> CSP to sign these URLs, however, that would mean signing them with =
an=20
>>> expiration time of at least the length of the content item.
>>=20
>> Isn't that the same for the case where both the manifest & content is=20=

>> served by the dCDN? The Content Provider only gets one chance to sign =
a=20
>> cookie in that case too?
>=20
> The initial cookie yes. But the dCDN has the chance of=20
> refreshing/resigning the cookie every time a new request comes in.=20

I'm struggling a little to get a picture of how you imagine this =
working?

If the dCDN is seeing a valid (token in a) cookie and then setting a new =
(token in a) cookie to effectively extend the validity of authorisation =
to access the content, it is not clear to me how that is in practice any =
different to setting a single cookie with a long expiration time.

Could you explain a bit what the difference are?

>> I also don't understand why the Content Provider delivering the =
manifest=20
>> and the dCDN delivering the content results in the Content Provider=20=

>> having to sign the individual URLs in the manifest.
>>=20
>> AFAIK (I haven't tested it), the Content Provider can deliver the=20
>> manifest from manifest.video.example.com and deliver the content via =
the=20
>> uCDN/dCDN by using URLs pointing to chunks.video.example.com and =
share=20
>> cookies across the domains by setting the token in a cookie with a =
Domain=20
>> attribute of ".video.example.com".
>=20
> I believe most browser implementations reject cross-domain cookies, =
unless=20
> using CORS.=20

What I described are not really cross-domain cookies, the situation I =
describe above is allowed by RFC6265 for instance and is not the same as =
say manifest.bar.com trying to set a cookie for chunks.foo.com

Having said that I have no idea whether browsers typically have a =
stricter policy than specified in RFC6265 but I have seen references on =
various help websites (e.g. stack overflow) suggesting what I describe =
above as being allowed by browsers.

>> Alternatively the Content Provider could use CORS to enable cookie=20
>> sharing across domains.
>=20
> I haven=92t thought of using CORS before. In theory I guess it should =
be=20
> possible. Do you have any idea on whether such a mechanism is used in=20=

> practice by players/CDNs?

We have customers that use CORS as part of their video services/players =
(where we are the CDN) but I am not in a position to share many details. =
I have seen CORS used to deliver video to Chromecast devices.

>>> For an MPD of a 90min movie, that would mean expiration times of at=20=

>>> least 90mins, which would reduce, if not negate altogether, the=20
>>> effectiveness of signing the URLs in the first place.
>>=20
>> There are other approaches to avoid long expiration times, e.g =
defining=20
>> the semantics of the token so that it expiration applies to TCP=20
>> connection setup and so multiple requests are allowed on a persistent=20=

>> connection past the expiration time of the token.=20
>=20
> Hmm, yes, that would probably work, although it would give issues in =
case=20
> of dropped TCP connections. It does sound a bit like a cross-layer=20
> violation. Are you aware of any implementations that work like this?

I am not aware of any implementations that work like that.

Another way to minimise the possible exposure of a long expiration time =
would be to "lock" the token to the client's IP address, although that =
is not perfect in all cases either.

Ben

>=20
> Ray
>=20
>>=20
>> Ben
> This message may contain information that is not intended for you. If =
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