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From: <mohamed.boucadair@orange.com>
To: ADD Mailing list <add@ietf.org>
CC: "Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com)" <TirumaleswarReddy_Konda@McAfee.com>, "Dan Wing <dan@danwing.org> (dan@danwing.org)" <dan@danwing.org>
Thread-Topic: I-D Action: draft-btw-add-home-00.txt
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Hi all,=20

We submitted this new I-D.

Comments and suggestions are welcome.

Cheers,
Med

-----Message d'origine-----
De=A0: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] De la part de in=
ternet-drafts@ietf.org
Envoy=E9=A0: mercredi 4 mars 2020 09:09
=C0=A0: i-d-announce@ietf.org
Objet=A0: I-D Action: draft-btw-add-home-00.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.


        Title           : DoH/DoT Deployment Considerations for Home Networ=
ks
        Authors         : Mohamed Boucadair
                          Tirumaleswar Reddy
                          Dan Wing
	Filename        : draft-btw-add-home-00.txt
	Pages           : 17
	Date            : 2020-03-04

Abstract:
   This document discusses DoT/DoH deployment considerations for home
   networks.  It particularly sketches the required steps to use DoT/DoH
   capabilities provided by local networks.

   One of the goals of this document is to assess to what extent
   existing tools can be used to provide a DoT/DoH service.  As an
   outcome, new DHCP and Router Advertisement Options are specified in
   order to convey a DNS Authentication Domain Name.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-btw-add-home/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-btw-add-home-00
https://datatracker.ietf.org/doc/html/draft-btw-add-home-00


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

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


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From: Tommy Jensen <Jensen.Thomas@microsoft.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, ADD Mailing list <add@ietf.org>
CC: "Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com)" <TirumaleswarReddy_Konda@McAfee.com>, "Dan Wing <dan@danwing.org> (dan@danwing.org)" <dan@danwing.org>
Thread-Topic: I-D Action: draft-btw-add-home-00.txt
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Subject: Re: [Add] I-D Action: draft-btw-add-home-00.txt
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Hey Med,

Thanks for sharing. Based on Section 10, it seems the intent of this draft =
is to ensure use of DoT/DoH servers is prohibited until the user sees and a=
grees to a privacy policy (exception: the device is configured ahead of tim=
e by an admin to trust the given server). Is that accurate?

If this is the case, I would be opposed to this version of the draft. While=
 I agree users and admins should have more control over their DNS queries, =
blocking Internet access on DNS server approval for home users (with no ent=
erprise admin to do the hard work for them) seems like a deal breaker for O=
S vendors. I wouldn't block an HTTPS connection until the user reviews the =
certificate chain either. Having this information available to decorate Int=
ernet connection UI seems wise but blocking connectivity on approval is too=
 heavy handed for the general use case for OSes.

Other feedback:

  *   I see you're using "Do53" and referring to RFC8499. That RFC doesn't =
specify whether "Do53" or "classic DNS" or something else is the appropriat=
e term. There is a draft<https://tools.ietf.org/html/draft-hoffman-dns-term=
inology-ter-02> to address this by defining "classic DNS" but it expired. P=
robably time for us to revisit that and formalize a term we can all use.

  *   Section 1:
     *   s/sotrage/storage
     *   s/resolexpervers/resolvers

Thanks,
Tommy

________________________________
From: Add <add-bounces@ietf.org> on behalf of mohamed.boucadair@orange.com =
<mohamed.boucadair@orange.com>
Sent: Wednesday, March 4, 2020 1:52 AM
To: ADD Mailing list <add@ietf.org>
Cc: Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com) <Tirumal=
eswarReddy_Konda@McAfee.com>; Dan Wing <dan@danwing.org> (dan@danwing.org) =
<dan@danwing.org>
Subject: [EXTERNAL] [Add] TR: I-D Action: draft-btw-add-home-00.txt

Hi all,

We submitted this new I-D.

Comments and suggestions are welcome.

Cheers,
Med

-----Message d'origine-----
De : I-D-Announce [mailto:i-d-announce-bounces@ietf.org] De la part de inte=
rnet-drafts@ietf.org
Envoy=E9 : mercredi 4 mars 2020 09:09
=C0 : i-d-announce@ietf.org
Objet : I-D Action: draft-btw-add-home-00.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.


        Title           : DoH/DoT Deployment Considerations for Home Networ=
ks
        Authors         : Mohamed Boucadair
                          Tirumaleswar Reddy
                          Dan Wing
        Filename        : draft-btw-add-home-00.txt
        Pages           : 17
        Date            : 2020-03-04

Abstract:
   This document discusses DoT/DoH deployment considerations for home
   networks.  It particularly sketches the required steps to use DoT/DoH
   capabilities provided by local networks.

   One of the goals of this document is to assess to what extent
   existing tools can be used to provide a DoT/DoH service.  As an
   outcome, new DHCP and Router Advertisement Options are specified in
   order to convey a DNS Authentication Domain Name.


The IETF datatracker status page for this draft is:
https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatra=
cker.ietf.org%2Fdoc%2Fdraft-btw-add-home%2F&amp;data=3D02%7C01%7CJensen.Tho=
mas%40microsoft.com%7C5f21d93bdb3949ebf5d608d7c021c80a%7C72f988bf86f141af91=
ab2d7cd011db47%7C1%7C0%7C637189123649108842&amp;sdata=3DF8pys3zEoy0vOGnOgT7=
8LOJIbKzaNlMgtDconAJ2hLQ%3D&amp;reserved=3D0

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<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Hey Med,</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Thanks for sharing. Based on Section 10, it seems the intent of this draft =
is to ensure use of DoT/DoH servers is prohibited until the user sees and a=
grees to a privacy policy (exception: the device is configured ahead of tim=
e by an admin to trust the given
 server). Is that accurate?</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
If this is the case, I would be opposed to this version of the draft. While=
 I agree users and admins should have more control over their DNS queries, =
blocking Internet access on DNS server approval for home users (with no ent=
erprise admin to do the hard work
 for them) seems like a deal breaker for OS vendors. I wouldn't block an HT=
TPS connection until the user reviews the certificate chain either. Having =
this information available to decorate Internet connection UI seems wise bu=
t blocking connectivity on approval
 is too heavy handed for the general use case for OSes.</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Other feedback:</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<ul>
<li>I see you're using &quot;Do53&quot; and referring to RFC8499. That RFC =
doesn't specify whether &quot;Do53&quot; or &quot;classic DNS&quot; or some=
thing else is the appropriate term. There is a
<a href=3D"https://tools.ietf.org/html/draft-hoffman-dns-terminology-ter-02=
" title=3D"https://tools.ietf.org/html/draft-hoffman-dns-terminology-ter-02=
" style=3D"">
draft</a> to address this by defining &quot;classic DNS&quot; but it expire=
d. Probably time for us to revisit that and formalize a term we can all use=
.</li></ul>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<ul>
<li>Section 1:&nbsp;</li><ul>
<li>s/sotrage/storage</li><li>s/resolexpervers/resolvers<br>
</li></ul>
</ul>
<div>Thanks,</div>
<div>Tommy</div>
<div><br>
</div>
</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Add &lt;add-bounces@i=
etf.org&gt; on behalf of mohamed.boucadair@orange.com &lt;mohamed.boucadair=
@orange.com&gt;<br>
<b>Sent:</b> Wednesday, March 4, 2020 1:52 AM<br>
<b>To:</b> ADD Mailing list &lt;add@ietf.org&gt;<br>
<b>Cc:</b> Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com) &=
lt;TirumaleswarReddy_Konda@McAfee.com&gt;; Dan Wing &lt;dan@danwing.org&gt;=
 (dan@danwing.org) &lt;dan@danwing.org&gt;<br>
<b>Subject:</b> [EXTERNAL] [Add] TR: I-D Action: draft-btw-add-home-00.txt<=
/font>
<div>&nbsp;</div>
</div>
<div class=3D"BodyFragment"><font size=3D"2"><span style=3D"font-size:11pt;=
">
<div class=3D"PlainText">Hi all, <br>
<br>
We submitted this new I-D.<br>
<br>
Comments and suggestions are welcome.<br>
<br>
Cheers,<br>
Med<br>
<br>
-----Message d'origine-----<br>
De&nbsp;: I-D-Announce [<a href=3D"mailto:i-d-announce-bounces@ietf.org">ma=
ilto:i-d-announce-bounces@ietf.org</a>] De la part de internet-drafts@ietf.=
org<br>
Envoy=E9&nbsp;: mercredi 4 mars 2020 09:09<br>
=C0&nbsp;: i-d-announce@ietf.org<br>
Objet&nbsp;: I-D Action: draft-btw-add-home-00.txt<br>
<br>
<br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Title&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : DoH/DoT Deployment Considerations for H=
ome Networks<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Authors&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; : Mohamed Boucadair<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Tirumaleswar Reddy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Dan Wing<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Filename&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; : draft-btw-add-home-00.txt<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Pages&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 17<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Date&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 2020-03-04<br>
<br>
Abstract:<br>
&nbsp;&nbsp; This document discusses DoT/DoH deployment considerations for =
home<br>
&nbsp;&nbsp; networks.&nbsp; It particularly sketches the required steps to=
 use DoT/DoH<br>
&nbsp;&nbsp; capabilities provided by local networks.<br>
<br>
&nbsp;&nbsp; One of the goals of this document is to assess to what extent<=
br>
&nbsp;&nbsp; existing tools can be used to provide a DoT/DoH service.&nbsp;=
 As an<br>
&nbsp;&nbsp; outcome, new DHCP and Router Advertisement Options are specifi=
ed in<br>
&nbsp;&nbsp; order to convey a DNS Authentication Domain Name.<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
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From: "Deen, Glenn" <Glenn_Deen@comcast.com>
To: ADD Mailing list <add@ietf.org>
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From: Paul Hoffman <paul.hoffman@icann.org>
To: "Deen, Glenn" <Glenn_Deen@comcast.com>
CC: ADD Mailing list <add@ietf.org>
Thread-Topic: [Ext] [Add] ADD Planning for IETF107
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Date: Sat, 7 Mar 2020 00:34:51 +0000
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Subject: Re: [Add] [Ext]  ADD Planning for IETF107
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FWIW, I consider draft-ietf-dnsop-resolver-information and =
draft-sah-resinfo-doh to be as much about discovery of secure resolvers =
as they are about resolver information. That is, if you know the address =
of your current resolver, you can ask it "are you my secure resolver" =
using those protocols.

Separately, I don't understand the inclusion of =
draft-arkko-abcd-distributed-resolver-selection in the agenda for this =
WG. The document gives its scope as:
   This memo discusses whether DNS clients can improve their privacy
   through the potential use of a set of multiple recursive resolver
   services.=20
This doesn't seem like it is about resolver discovery or resolver =
information, but instead about resolver assignment (probably by an =
application or OS). I like many of the ideas in the draft, but they =
don't seem to be home here.

--Paul Hoffman



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To: Paul Hoffman <paul.hoffman@icann.org>
CC: ADD Mailing list <add@ietf.org>, "Deen, Glenn" <Glenn_Deen@comcast.com>
Thread-Topic: [Add] ADD Planning for IETF107
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From: <mohamed.boucadair@orange.com>
To: Tommy Jensen <Jensen.Thomas@microsoft.com>, ADD Mailing list <add@ietf.org>
CC: "Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com)" <TirumaleswarReddy_Konda@McAfee.com>, "Dan Wing <dan@danwing.org> (dan@danwing.org)" <dan@danwing.org>
Thread-Topic: I-D Action: draft-btw-add-home-00.txt
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Subject: Re: [Add] I-D Action: draft-btw-add-home-00.txt
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Hi Tommy,

Thank you for the comments.

Please see inline.

Cheers,
Med

De : Tommy Jensen [mailto:Jensen.Thomas@microsoft.com]
Envoy=E9 : vendredi 6 mars 2020 19:03
=C0 : BOUCADAIR Mohamed TGI/OLN; ADD Mailing list
Cc : Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com); Dan Wi=
ng <dan@danwing.org> (dan@danwing.org)
Objet : Re: I-D Action: draft-btw-add-home-00.txt

Hey Med,

Thanks for sharing. Based on Section 10,
[Med] I guess you meant the Security section.

it seems the intent of this draft is to ensure use of DoT/DoH servers is pr=
ohibited until the user sees and agrees to a privacy policy (exception: the=
 device is configured ahead of time by an admin to trust the given server).=
 Is that accurate?

[Med] The draft discusses many options under which the DNS client auto-upgr=
ades to use a discovered local DoH/DoT server without seeking for the user =
consent, but we have one particular case (called out in the security consid=
erations Section) in which some 'input' is required to avoid a misuse of th=
e service. That input can be a global configuration parameter, an explicit =
consent, a default, etc.

We need collectively to think about the exact behavior to follow. For examp=
le, it does not make sense to seek for the user consent to upgrade to DoT/D=
oH while that same server is used for Do53.

If this is the case, I would be opposed to this version of the draft. While=
 I agree users and admins should have more control over their DNS queries, =
blocking Internet access on DNS server approval for home users (with no ent=
erprise admin to do the hard work for them) seems like a deal breaker for O=
S vendors. I wouldn't block an HTTPS connection until the user reviews the =
certificate chain either. Having this information available to decorate Int=
ernet connection UI seems wise but blocking connectivity on approval is too=
 heavy handed for the general use case for OSes.

Other feedback:

  *   I see you're using "Do53" and referring to RFC8499. That RFC doesn't =
specify whether "Do53" or "classic DNS" or something else is the appropriat=
e term. There is a draft<https://tools.ietf.org/html/draft-hoffman-dns-term=
inology-ter-02> to address this by defining "classic DNS" but it expired. P=
robably time for us to revisit that and formalize a term we can all use.
[Med] Agree Do53 is not defined in RFC8499. It is defined in the dnsop I-D =
cited in Section 2.
   This document makes use of the terms defined in [RFC8499<https://tools.i=
etf.org/html/rfc8499>] and
  [I-D.ietf-dnsop-terminology-ter<https://tools.ietf.org/html/draft-btw-add=
-home-01#ref-I-D.ietf-dnsop-terminology-ter>].
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  *   Section 1:

     *   s/sotrage/storage
     *   s/resolexpervers/resolvers
[Med] Thank you for catching those. We have already fixed them in -01: http=
s://tools.ietf.org/html/draft-btw-add-home.
Thanks,
Tommy

________________________________
From: Add <add-bounces@ietf.org> on behalf of mohamed.boucadair@orange.com =
<mohamed.boucadair@orange.com>
Sent: Wednesday, March 4, 2020 1:52 AM
To: ADD Mailing list <add@ietf.org>
Cc: Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com) <Tirumal=
eswarReddy_Konda@McAfee.com>; Dan Wing <dan@danwing.org> (dan@danwing.org) =
<dan@danwing.org>
Subject: [EXTERNAL] [Add] TR: I-D Action: draft-btw-add-home-00.txt

Hi all,

We submitted this new I-D.

Comments and suggestions are welcome.

Cheers,
Med

-----Message d'origine-----
De : I-D-Announce [mailto:i-d-announce-bounces@ietf.org] De la part de inte=
rnet-drafts@ietf.org
Envoy=E9 : mercredi 4 mars 2020 09:09
=C0 : i-d-announce@ietf.org
Objet : I-D Action: draft-btw-add-home-00.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.


        Title           : DoH/DoT Deployment Considerations for Home Networ=
ks
        Authors         : Mohamed Boucadair
                          Tirumaleswar Reddy
                          Dan Wing
        Filename        : draft-btw-add-home-00.txt
        Pages           : 17
        Date            : 2020-03-04

Abstract:
   This document discusses DoT/DoH deployment considerations for home
   networks.  It particularly sketches the required steps to use DoT/DoH
   capabilities provided by local networks.

   One of the goals of this document is to assess to what extent
   existing tools can be used to provide a DoT/DoH service.  As an
   outcome, new DHCP and Router Advertisement Options are specified in
   order to convey a DNS Authentication Domain Name.


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<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">Hi Tommy,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">Thank you for the comments.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">Please see inline.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">Med<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"FR" style=3D"font-size:10.0pt;font-=
family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">De&nbsp;:</span></b><span=
 lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot=
;sans-serif&quot;"> Tommy Jensen [mailto:Jensen.Thomas@microsoft.com]
<br>
<b>Envoy=E9&nbsp;:</b> vendredi 6 mars 2020 19:03<br>
<b>=C0&nbsp;:</b> BOUCADAIR Mohamed TGI/OLN; ADD Mailing list<br>
<b>Cc&nbsp;:</b> Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.=
com); Dan Wing &lt;dan@danwing.org&gt; (dan@danwing.org)<br>
<b>Objet&nbsp;:</b> Re: I-D Action: draft-btw-add-home-00.txt<o:p></o:p></s=
pan></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Hey Med,<o:p></o:=
p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Thanks for sharin=
g. Based on Section 10,</span><span style=3D"font-family:&quot;Calibri&quot=
;,&quot;sans-serif&quot;;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"font=
-size:11.0pt;font-family:&quot;Courier New&quot;;color:#1F497D">[Med] I gue=
ss you meant the Security section. &nbsp;<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"font=
-size:11.0pt;font-family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;=
</o:p></span></i></b></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">it seems the inte=
nt of this draft is to ensure use of DoT/DoH servers is prohibited until th=
e user sees and agrees to a privacy policy (exception: the
 device is configured ahead of time by an admin to trust the given server).=
 Is that accurate?<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"font=
-size:11.0pt;font-family:&quot;Courier New&quot;;color:#1F497D">[Med] The d=
raft discusses many options under which the DNS client auto-upgrades to use=
 a discovered local DoH/DoT server without seeking
 for the user consent, but we have one particular case (called out in the s=
ecurity considerations Section) in which some &#8216;input&#8217; is requir=
ed to avoid a misuse of the service. That input can be a global configurati=
on parameter, an explicit consent, a default,
 etc. <o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"font=
-size:11.0pt;font-family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;=
</o:p></span></i></b></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"font=
-size:11.0pt;font-family:&quot;Courier New&quot;;color:#1F497D">We need col=
lectively to think about the exact behavior to follow. For example, it does=
 not make sense to seek for the user consent to
 upgrade to DoT/DoH while that same server is used for Do53.<o:p></o:p></sp=
an></i></b></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-size:=
11.0pt;font-family:&quot;Courier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">If this is the ca=
se, I would be opposed to this version of the draft. While I agree users an=
d admins should have more control over their DNS queries,
 blocking Internet access on DNS server approval for home users (with no en=
terprise admin to do the hard work for them) seems like a deal breaker for =
OS vendors. I wouldn't block an HTTPS connection until the user reviews the=
 certificate chain either. Having
 this information available to decorate Internet connection UI seems wise b=
ut blocking connectivity on approval is too heavy handed for the general us=
e case for OSes.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Other feedback:<o=
:p></o:p></span></p>
</div>
<div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo1;background:white">
<span style=3D"font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">I se=
e you're using &quot;Do53&quot; and referring to RFC8499. That RFC doesn't =
specify whether &quot;Do53&quot; or &quot;classic DNS&quot; or something el=
se is the appropriate term. There is a
<a href=3D"https://tools.ietf.org/html/draft-hoffman-dns-terminology-ter-02=
" title=3D"https://tools.ietf.org/html/draft-hoffman-dns-terminology-ter-02=
">
draft</a> to address this by defining &quot;classic DNS&quot; but it expire=
d. Probably time for us to revisit that and formalize a term we can all use=
.<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;background:white">
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Courier New&quot;;c=
olor:#1F497D">[Med] Agree Do53 is not defined in RFC8499. It is defined in =
the dnsop I-D cited in Section 2.<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; This document makes use of the terms defined =
in [<a href=3D"https://tools.ietf.org/html/rfc8499" title=3D"&quot;DNS Term=
inology&quot;">RFC8499</a>] and<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;[<a href=3D"https://tools.ietf.org/html/draft-=
btw-add-home-01#ref-I-D.ietf-dnsop-terminology-ter" title=3D"&quot;Terminol=
ogy for DNS Transports and Location&quot;">I-D.ietf-dnsop-terminology-ter</=
a>].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<o:p></o:p></=
span></p>
</div>
<div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l1 level1 lfo2;background:white">
<span style=3D"font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">Sect=
ion 1:&nbsp;<o:p></o:p></span></li></ul>
<ul type=3D"disc">
<ul type=3D"circle">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l1 level2 lfo2;background:white">
<span style=3D"font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">s/so=
trage/storage<o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"color:=
black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level2=
 lfo2;background:white">
<span style=3D"font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">s/re=
solexpervers/resolvers<o:p></o:p></span></li></ul>
</ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;background:white">
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Courier New&quot;;c=
olor:#1F497D">[Med] Thank you for catching those. We have already fixed the=
m in -01:
<a href=3D"https://tools.ietf.org/html/draft-btw-add-home">https://tools.ie=
tf.org/html/draft-btw-add-home</a>.
</span></i></b><span style=3D"font-size:11.0pt;font-family:&quot;Courier Ne=
w&quot;;color:#1F497D"><o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Thanks,<o:p></o:p=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Tommy<o:p></o:p><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p>=
</span></p>
</div>
</div>
<div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center">
<hr size=3D"2" width=3D"98%" align=3D"center">
</div>
<div id=3D"divRplyFwdMsg">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:black">From:</span></b><span st=
yle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&qu=
ot;;color:black"> Add &lt;add-bounces@ietf.org&gt; on behalf of mohamed.bou=
cadair@orange.com
 &lt;mohamed.boucadair@orange.com&gt;<br>
<b>Sent:</b> Wednesday, March 4, 2020 1:52 AM<br>
<b>To:</b> ADD Mailing list &lt;add@ietf.org&gt;<br>
<b>Cc:</b> Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com) &=
lt;TirumaleswarReddy_Konda@McAfee.com&gt;; Dan Wing &lt;dan@danwing.org&gt;=
 (dan@danwing.org) &lt;dan@danwing.org&gt;<br>
<b>Subject:</b> [EXTERNAL] [Add] TR: I-D Action: draft-btw-add-home-00.txt<=
/span>
<o:p></o:p></p>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Hi all, <br>
<br>
We submitted this new I-D.<br>
<br>
Comments and suggestions are welcome.<br>
<br>
Cheers,<br>
Med<br>
<br>
-----Message d'origine-----<br>
De&nbsp;: I-D-Announce [<a href=3D"mailto:i-d-announce-bounces@ietf.org">ma=
ilto:i-d-announce-bounces@ietf.org</a>] De la part de internet-drafts@ietf.=
org<br>
Envoy=E9&nbsp;: mercredi 4 mars 2020 09:09<br>
=C0&nbsp;: i-d-announce@ietf.org<br>
Objet&nbsp;: I-D Action: draft-btw-add-home-00.txt<br>
<br>
<br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Title&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : DoH/DoT Deployment Considerations for H=
ome Networks<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Authors&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; : Mohamed Boucadair<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Tirumaleswar Reddy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Dan Wing<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Filename&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; : draft-btw-add-home-00.txt<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Pages&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 17<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Date&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 2020-03-04<br>
<br>
Abstract:<br>
&nbsp;&nbsp; This document discusses DoT/DoH deployment considerations for =
home<br>
&nbsp;&nbsp; networks.&nbsp; It particularly sketches the required steps to=
 use DoT/DoH<br>
&nbsp;&nbsp; capabilities provided by local networks.<br>
<br>
&nbsp;&nbsp; One of the goals of this document is to assess to what extent<=
br>
&nbsp;&nbsp; existing tools can be used to provide a DoT/DoH service.&nbsp;=
 As an<br>
&nbsp;&nbsp; outcome, new DHCP and Router Advertisement Options are specifi=
ed in<br>
&nbsp;&nbsp; order to convey a DNS Authentication Domain Name.<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-btw-add-home%2F&amp;amp;data=3D02%7C=
01%7CJensen.Thomas%40microsoft.com%7C5f21d93bdb3949ebf5d608d7c021c80a%7C72f=
988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637189123649108842&amp;amp;sdata=3D=
F8pys3zEoy0vOGnOgT78LOJIbKzaNlMgtDconAJ2hLQ%3D&amp;amp;reserved=3D0">https:=
//nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatracker.i=
etf.org%2Fdoc%2Fdraft-btw-add-home%2F&amp;amp;data=3D02%7C01%7CJensen.Thoma=
s%40microsoft.com%7C5f21d93bdb3949ebf5d608d7c021c80a%7C72f988bf86f141af91ab=
2d7cd011db47%7C1%7C0%7C637189123649108842&amp;amp;sdata=3DF8pys3zEoy0vOGnOg=
T78LOJIbKzaNlMgtDconAJ2hLQ%3D&amp;amp;reserved=3D0</a><br>
<br>
There are also htmlized versions available at:<br>
<a href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Ftools.ietf.org%2Fhtml%2Fdraft-btw-add-home-00&amp;amp;data=3D02%7C01%7C=
Jensen.Thomas%40microsoft.com%7C5f21d93bdb3949ebf5d608d7c021c80a%7C72f988bf=
86f141af91ab2d7cd011db47%7C1%7C0%7C637189123649108842&amp;amp;sdata=3DEhFMo=
Mg65FtPOpz2IJTWO%2BsYDL178RA75fjy7V2yHI0%3D&amp;amp;reserved=3D0">https://n=
am06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.ietf.org%2=
Fhtml%2Fdraft-btw-add-home-00&amp;amp;data=3D02%7C01%7CJensen.Thomas%40micr=
osoft.com%7C5f21d93bdb3949ebf5d608d7c021c80a%7C72f988bf86f141af91ab2d7cd011=
db47%7C1%7C0%7C637189123649108842&amp;amp;sdata=3DEhFMoMg65FtPOpz2IJTWO%2Bs=
YDL178RA75fjy7V2yHI0%3D&amp;amp;reserved=3D0</a><br>
<a href=3D"https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-btw-add-home-00&amp;amp;data=
=3D02%7C01%7CJensen.Thomas%40microsoft.com%7C5f21d93bdb3949ebf5d608d7c021c8=
0a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637189123649108842&amp;amp;=
sdata=3D758uOmwdnh7QdcYVc4HtGgbeMIFHuLjtMp7wFsdS1mE%3D&amp;amp;reserved=3D0=
">https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatat=
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Date: Mon, 09 Mar 2020 10:37:15 +1100
From: "Martin Thomson" <mt@lowentropy.net>
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Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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This seems very similar to draft-peterson-doh-dhcp and draft-peterson-do=
t-dhcp.  It claims to address both, but the mechanism is identical to th=
e DoT piece.  There is a bunch more meat to the draft that I appreciate =
in terms of setting context.

How do you anticipate DoH servers being located using this?  I don't see=
 any way you could acquire the URI template using the provided options.

On Wed, Mar 4, 2020, at 20:52, mohamed.boucadair@orange.com wrote:
> Hi all,=20
>=20
> We submitted this new I-D.
>=20
> Comments and suggestions are welcome.
>=20
> Cheers,
> Med
>=20
> -----Message d'origine-----
> De=C2=A0: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] De la pa=
rt de=20
> internet-drafts@ietf.org
> Envoy=C3=A9=C2=A0: mercredi 4 mars 2020 09:09
> =C3=80=C2=A0: i-d-announce@ietf.org
> Objet=C2=A0: I-D Action: draft-btw-add-home-00.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts dir=
ectories.
>=20
>=20
>         Title           : DoH/DoT Deployment Considerations for Home N=
etworks
>         Authors         : Mohamed Boucadair
>                           Tirumaleswar Reddy
>                           Dan Wing
> 	Filename        : draft-btw-add-home-00.txt
> 	Pages           : 17
> 	Date            : 2020-03-04
>=20
> Abstract:
>    This document discusses DoT/DoH deployment considerations for home
>    networks.  It particularly sketches the required steps to use DoT/D=
oH
>    capabilities provided by local networks.
>=20
>    One of the goals of this document is to assess to what extent
>    existing tools can be used to provide a DoT/DoH service.  As an
>    outcome, new DHCP and Router Advertisement Options are specified in=

>    order to convey a DNS Authentication Domain Name.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-btw-add-home/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-btw-add-home-00
> https://datatracker.ietf.org/doc/html/draft-btw-add-home-00
>=20
>=20
> Please note that it may take a couple of minutes from the time of subm=
ission
> 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
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Cc: "Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com)" <TirumaleswarReddy_Konda@McAfee.com>, "Dan Wing <dan@danwing.org> (dan@danwing.org)" <dan@danwing.org>
References: <158330934617.29404.4287578882183435520@ietfa.amsl.com> <787AE7BB302AE849A7480A190F8B93303145E6CC@OPEXCAUBMA2.corporate.adroot.infra.ftgroup>
From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Date: Mon, 9 Mar 2020 00:17:43 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/add/BJP9cZljcUq6Z_Q-lk_5WUt0Jak>
Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: mohamed.boucadair@orange.com, ADD Mailing list <add@ietf.org>
Cc: "Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com)"
 <TirumaleswarReddy_Konda@McAfee.com>,
 "Dan Wing <dan@danwing.org> (dan@danwing.org)" <dan@danwing.org>
Message-ID: <19edb851-603e-bb5d-f170-be9f1d796738@cs.tcd.ie>
Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
References: <158330934617.29404.4287578882183435520@ietfa.amsl.com>
 <787AE7BB302AE849A7480A190F8B93303145E6CC@OPEXCAUBMA2.corporate.adroot.infra.ftgroup>
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Hiya,

On 04/03/2020 09:52, mohamed.boucadair@orange.com wrote:
> Hi all,=20
>=20
> We submitted this new I-D.

I read the -00 and just scanned the diff to -01.

I'm not sure this is the right approach. It's worth
talking about though.

Aside from issues already raised, (with which I might
end up agreeing, not sure yet), I have one major issue
with the draft...

I have a home router that uses DoT (as a forwarder)
to a server I configured. (Actually I also operate the
server but that's beside the point:-) Since I set that
up, later releases of the router OS (Turris) ship with
DoT server configs that can be chosen via GUI on the
router. Not sure if they have a DoH option, but there's
no reason that couldn't be added. None of that involves
my ISP. None of that needs to. I don't think that model
is envisaged in the draft text, at least as I read it.
I think it should be, as that architectural component
(home router or server or g/w that's not owned by ISP
nor by other mega-company but that exists to do the
home n/w owner's bidding) is, I think, important to
support well.

I do get that, today, such setups are rare. But we
should still support 'em, because they do allow for
better service to home n/w users, even if the much
more likely defaults are less optimal in that respect.

Cheers,
S.





>=20
> Comments and suggestions are welcome.
>=20
> Cheers,
> Med
>=20
> -----Message d'origine-----
> De=C2=A0: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] De la par=
t de internet-drafts@ietf.org
> Envoy=C3=A9=C2=A0: mercredi 4 mars 2020 09:09
> =C3=80=C2=A0: i-d-announce@ietf.org
> Objet=C2=A0: I-D Action: draft-btw-add-home-00.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts dire=
ctories.
>=20
>=20
>         Title           : DoH/DoT Deployment Considerations for Home Ne=
tworks
>         Authors         : Mohamed Boucadair
>                           Tirumaleswar Reddy
>                           Dan Wing
> 	Filename        : draft-btw-add-home-00.txt
> 	Pages           : 17
> 	Date            : 2020-03-04
>=20
> Abstract:
>    This document discusses DoT/DoH deployment considerations for home
>    networks.  It particularly sketches the required steps to use DoT/Do=
H
>    capabilities provided by local networks.
>=20
>    One of the goals of this document is to assess to what extent
>    existing tools can be used to provide a DoT/DoH service.  As an
>    outcome, new DHCP and Router Advertisement Options are specified in
>    order to convey a DNS Authentication Domain Name.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-btw-add-home/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-btw-add-home-00
> https://datatracker.ietf.org/doc/html/draft-btw-add-home-00
>=20
>=20
> Please note that it may take a couple of minutes from the time of submi=
ssion
> 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
>=20
> _______________________________________________
> I-D-Announce mailing list
> I-D-Announce@ietf.org
> https://www.ietf.org/mailman/listinfo/i-d-announce
> Internet-Draft directories: http://www.ietf.org/shadow.html
> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>=20

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To: Martin Thomson <mt@lowentropy.net>, "add@ietf.org" <add@ietf.org>
Thread-Topic: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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From: <mohamed.boucadair@orange.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, ADD Mailing list <add@ietf.org>
CC: "Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com)" <TirumaleswarReddy_Konda@McAfee.com>, "Dan Wing <dan@danwing.org> (dan@danwing.org)" <dan@danwing.org>
Thread-Topic: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Date: Mon, 9 Mar 2020 12:28:26 +0000
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Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: mohamed.boucadair@orange.com, ADD Mailing list <add@ietf.org>
Cc: "Konda, Tirumaleswar Reddy (TirumaleswarReddy_Konda@McAfee.com)"
 <TirumaleswarReddy_Konda@McAfee.com>,
 "Dan Wing <dan@danwing.org> (dan@danwing.org)" <dan@danwing.org>
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Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Hiya,

On 09/03/2020 12:28, mohamed.boucadair@orange.com wrote:

> [Med] Your scenario would look like the following:=20
>=20
>                       ,--,--,--.             ,--,--,--.
>         DoT-capable ,-'          `-.       ,-' 3rd Party `-.
>           Host----(      LAN      CPE----(    DNS Server  )
>              |     `-.          ,-'|      `-.          ,-'
>              |        `--'--'--'   |         `--'--'--'
>              |                     |             |=20
>              |<=3D=3D=3D=3D=3D=3DDoT/DoH=3D=3D=3D=3D=3D=3D>|<=3D=3DDoT/=
DoH=3D=3D>|
>=20

Not quite that. Sorry for the absence of ascii-art but
the CPE provided by the ISP is not the DoT-enabled home
router in my case - I have a 2nd router inside the home
n/w  (from the POV of the ISP's CPE). The devices inside
the home n/w (other than a couple of oddities) use that
2nd router and today do Do53 to that. There are also
some devices that use DoH or Dot to CF or other places
I've configured.

> Before answering whether this case is covered in the current version of=
 the draft, can you please clarify which setup actions do you perform (in=
cluding on the CPE and the host)? E.g., Do you get a domain name? Do you =
make use of certificates? Thank you.
>=20

In my setup all the certs are verifiable chaining up
to the usual browser root stores.

But my main comment is that the home router that does
almost all DNS might not be provided by the ISP so any
discovery or similar protocol ought not make that
assumption. I recognise that that's a corner-case and
it may remain so, but equally, home networks might
develop in other directions due to a plethora of
small devices unrelated to the ISP, so we should
keep that kind of setup in mind.

Cheers,
S.



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-----END PGP PUBLIC KEY BLOCK-----

--------------4093293D2B7F946F42F93723--

--JmJSZaATAMQczj7FudnfJ6ztA93C3rX70--

--0Gi1Uri9ZWohvPro96zssUkiizpktZiHe
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----

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To: Daniel Migault <daniel.migault=40ericsson.com@dmarc.ietf.org>
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Subject: Re: [Add] FW: New Version Notification for draft-mglt-add-rdp-00.txt
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Sent from my iPhone

> On Mar 9, 2020, at 11:39, Daniel Migault <daniel.migault=3D40ericsson.com@=
dmarc.ietf.org> wrote:
>=20
> =EF=BB=BFHi,=20
>=20
> Please find a description of the DNS Resolver Discovery Protocol (RDP).

You cannot really call it RDP. That is already in use for Remote Desktop Pro=
tocol. It would be way too confusing.

Paul=


From nobody Mon Mar  9 09:14:54 2020
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Date: Tue, 10 Mar 2020 12:02:22 +1100
From: "Martin Thomson" <mt@lowentropy.net>
To: mohamed.boucadair@orange.com, "add@ietf.org" <add@ietf.org>
Content-Type: text/plain
Archived-At: <https://mailarchive.ietf.org/arch/msg/add/nZq7nZsnk5bCp6l7NzJw6YOoSOA>
Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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On Mon, Mar 9, 2020, at 23:03, mohamed.boucadair@orange.com wrote:
> Good point about the URI template. The draft already includes the following:
> 
>    If DoH is supported by the DNS server, the DNS client may request the
>    URI resource record type [RFC7553] using the domain name discovered
>    using DNS Reference Identifier DHCP/RA option (Section 4) to use the
>    HTTPS URI scheme (Section 3 of [RFC8484]).

I missed that, thanks.

A URI template is not a URI, so that's a little odd.  But that's just semantics, I'm happy to wave that aside if others are.

A more substantive concern is that this creates a false equivalence between domain name and DoH service.  You can only ever have one DoH service for a given host if you choose this mechanism.  Using DNS like this means that the choice is made for the name as a whole and not as part of the proposed host configuration.  For me, I'd prefer something more explicit in the RA/DHCP/etc...


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In article <0D830DDA-79E5-4913-8AA0-A8592122728D@nohats.ca> you write:
>
>
>Sent from my iPhone
>
>> On Mar 9, 2020, at 11:39, Daniel Migault <daniel.migault=40ericsson.com@dmarc.ietf.org> wrote:
>> 
>> ﻿Hi, 
>> 
>> Please find a description of the DNS Resolver Discovery Protocol (RDP).
>
>You cannot really call it RDP. That is already in use for Remote Desktop Protocol. It would be
>way too confusing.

No, RDP is Reliable Data Protocol.  See RFCs 908 and 1151.

R's,
John

PS: Perhaps the horse has left the barn.



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Date: Tue, 10 Mar 2020 10:59:57 +0100 (CET)
From: Vittorio Bertola <vittorio.bertola@open-xchange.com>
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Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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> Il 09/03/2020 14:05 Stephen Farrell <stephen.farrell@cs.tcd.ie> ha scritto:
> 
> But my main comment is that the home router that does
> almost all DNS might not be provided by the ISP so any
> discovery or similar protocol ought not make that
> assumption. I recognise that that's a corner-case 

Yes, it's an infrequent case, but I would not call it a corner case. At least in Europe, there is regulation that requires all ISPs to allow users to buy and deploy any CPE they like. Also, it is relatively common, for smart users that couldn't get their ISP to do without the CPE, to deploy another router in front (LAN-side) of the CPE. This happens, for example, because the CPE has the appropriate fiber termination but the user's desired home router has not, but has other features that the user needs. So indeed these are use cases that have to be supported.

-- 
 
Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
vittorio.bertola@open-xchange.com 
Office @ Via Treviso 12, 10144 Torino, Italy


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From: Vittorio Bertola <vittorio.bertola@open-xchange.com>
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Subject: Re: [Add] I-D Action: draft-btw-add-home-00.txt
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>     Il 07/03/2020 18:18 mohamed.boucadair@orange.com ha scritto:
> 
> 
>     We need collectively to think about the exact behavior to follow. For example, it does not make sense to seek for the user consent to upgrade to DoT/DoH while that same server is used for Do53.
> 
I agree, though "user consent" is generic. If we suggest that as a best practice consent should be asked, we should make it explicit why, and what should the user be consenting to.

If user consent is introduced to comply with data protection laws, then the elements of the consent are:
- who will get the data
- what will that party do with the data
This means that the transmission channel over which data is sent to that party is unimportant in terms of consent, so if the user is ok with the DNS operator receiving their information via Do53, it can be assumed that he/she is also ok with the DNS operator receiving the same information via DoT/DoH or in any other way.

On the other hand, if the consent is tied to the degree of channel security that is offered, then indeed the switch of channel might affect the user's desire to consent. Still, if we can assume that DoT/DoH towards the same operator always offers more security than Do53, and that the user has already consented to Do53, then we can also assume that the user will be happy with DoT/DoH as well.

Bottom line: if we want to discuss consent-related issues in a draft, we should expand the reasons behind our suggestions. Or we can just strike the discussion entirely, as apparently it has been done in the last versions.

--

Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
vittorio.bertola@open-xchange.com mailto:vittorio.bertola@open-xchange.com 
Office @ Via Treviso 12, 10144 Torino, Italy

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  <div>
   <br>
  </div>
  <blockquote type="cite">
   <div>
    Il 07/03/2020 18:18 mohamed.boucadair@orange.com ha scritto:
   </div>
   <div>
    <br>
   </div>
   <div class="WordSection1">
    <div style="border: none; border-left: solid blue 1.5pt; padding: 0cm 0cm 0cm 4.0pt;">
     <div>
      <p style="background: white;" class="MsoNormal"><strong><em><span style="font-size: 11.0pt; font-family: 'Courier New'; color: #1f497d;">We need collectively to think about the exact behavior to follow. For example, it does not make sense to seek for the user consent to upgrade to DoT/DoH while that same server is used for Do53.</span></em></strong></p>
     </div>
    </div>
   </div>
  </blockquote>
  <div>
   I agree, though "user consent" is generic. If we suggest that as a best practice consent should be asked, we should make it explicit why, and what should the user be consenting to.
   <br>
  </div>
  <div>
   <br>
  </div>
  <div>
   If user consent is introduced to comply with data protection laws, then the elements of the consent are:
   <br>
  </div>
  <div>
   - who will get the data
   <br>
  </div>
  <div>
   - what will that party do with the data
  </div>
  <div>
   This means that the transmission channel over which data is sent to that party is unimportant in terms of consent, so if the user is ok with the DNS operator receiving their information via Do53, it can be assumed that he/she is also ok with the DNS operator receiving the same information via DoT/DoH or in any other way.
   <br>
  </div>
  <div>
   <br>
  </div>
  <div>
   On the other hand, if the consent is tied to the degree of channel security that is offered, then indeed the switch of channel might affect the user's desire to consent. Still, if we can assume that DoT/DoH towards the same operator always offers more security than Do53, and that the user has already consented to Do53, then we can also assume that the user will be happy with DoT/DoH as well.
   <br>
  </div>
  <div>
   <br>
  </div>
  <div>
   Bottom line: if we want to discuss consent-related issues in a draft, we should expand the reasons behind our suggestions. Or we can just strike the discussion entirely, as apparently it has been done in the last versions.
   <br>
  </div>
  <div class="io-ox-signature">
   <p>-- <br class=""></p>
   <pre class="">Vittorio Bertola | Head of Policy &amp; Innovation, Open-Xchange<br><a href="mailto:vittorio.bertola@open-xchange.com">vittorio.bertola@open-xchange.com</a> <br>Office @ Via Treviso 12, 10144 Torino, Italy</pre>
  </div> 
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Date: Tue, 10 Mar 2020 12:08:12 +0100
From: "Ian Maddison" <ian@mad.paris>
To: "Vittorio Bertola" <vittorio.bertola=40open-xchange.com@dmarc.ietf.org>, "ADD Mailing list" <add@ietf.org>
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Subject: Re: [Add] I-D Action: draft-btw-add-home-00.txt
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--4ef5f64115e449d78ce1da143f8f7395
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Hi Vittorio,

On Tue, 10 Mar 2020, at 11:18, Vittorio Bertola wrote:
> 
> On the other hand, if the consent is tied to the degree of channel security that is offered, then indeed the switch of channel might affect the user's desire to consent. Still, if we can assume that DoT/DoH towards the same operator always offers more security than Do53, and that the user has already consented to Do53, then we can also assume that the user will be happy with DoT/DoH as well. 

That sounds fine until you consider the probable DNS performance degradation of DoT/DoH compared to Do53. Perhaps users prefer to give prior consent to anything that affects their performance. Apologies if this isn't currently in scope, but nonetheless I feel it would be wise to also consider DNS performance aspects here.
--4ef5f64115e449d78ce1da143f8f7395
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<!DOCTYPE html><html><head><title></title><style type=3D"text/css">p.Mso=
Normal,p.MsoNoSpacing{margin:0}</style></head><body><div style=3D"font-f=
amily:verdana, sans-serif;color:rgb(0, 0, 205);">Hi Vittorio,<br></div><=
div style=3D"font-family:verdana, sans-serif;color:#0000cd;"><br></div><=
div style=3D"font-family:verdana, sans-serif;color:#0000cd;">On Tue, 10 =
Mar 2020, at 11:18, Vittorio Bertola wrote:<br></div><blockquote type=3D=
"cite" id=3D"qt"><div><br></div><div>On the other hand, if the consent i=
s tied to the degree of channel security that is offered, then indeed th=
e switch of channel might affect the user's desire to consent. Still, if=
 we can assume that DoT/DoH towards the same operator always offers more=
 security than Do53, and that the user has already consented to Do53, th=
en we can also assume that the user will be happy with DoT/DoH as well. =
<br></div></blockquote><div style=3D"font-family:verdana, sans-serif;col=
or:#0000cd;"><br></div><div style=3D"font-family:verdana, sans-serif;col=
or:#0000cd;">That sounds fine until you consider the probable DNS perfor=
mance degradation of DoT/DoH compared to Do53. Perhaps users prefer to g=
ive prior consent to anything that affects their performance. Apologies =
if this isn't currently in scope, but nonetheless I feel it would be wis=
e to also consider DNS performance aspects here.<br></div></body></html>
--4ef5f64115e449d78ce1da143f8f7395--


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From: <mohamed.boucadair@orange.com>
To: Martin Thomson <mt@lowentropy.net>, "add@ietf.org" <add@ietf.org>
Thread-Topic: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Hi Martin,

Defining an RA/DHCP option to achieve what you are describing is feasible b=
ut we need to think about the overall model before we go that path.=20

(1) For example, the domain name provided in RA/DHCP will be used to retrie=
ve supported DoH services following methods such as those in draft-ietf-doh=
-resolver-associated-doh. I see some advantages in restricting the informat=
ion to be conveyed by the network to a domain name and a of IP addresses as=
 we don't need a change to the network configuration to reflect a change of=
 DoH services.=20

This is less of a concern for DHCP but may be problematic for RAs (risk of =
stale information). Of course things can be automated but I think that we n=
eed to discuss these details.

(2) RFC8484 defines only a single variable "dns" but future specs can defin=
e other URI templates with other variables: How validation will be done by =
DHCP clients? Or should DHCP clients "blindly" pass that templates to DoH c=
lients that will proceed with the validation?

Thoughts?

Cheers,
Med

> -----Message d'origine-----
> De=A0: Martin Thomson [mailto:mt@lowentropy.net]
> Envoy=E9=A0: mardi 10 mars 2020 02:02
> =C0=A0: BOUCADAIR Mohamed TGI/OLN; add@ietf.org
> Objet=A0: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
>=20
> On Mon, Mar 9, 2020, at 23:03, mohamed.boucadair@orange.com wrote:
> > Good point about the URI template. The draft already includes the
> following:
> >
> >    If DoH is supported by the DNS server, the DNS client may request
> the
> >    URI resource record type [RFC7553] using the domain name
> discovered
> >    using DNS Reference Identifier DHCP/RA option (Section 4) to use
> the
> >    HTTPS URI scheme (Section 3 of [RFC8484]).
>=20
> I missed that, thanks.
>=20
> A URI template is not a URI, so that's a little odd.  But that's just
> semantics, I'm happy to wave that aside if others are.
>=20
> A more substantive concern is that this creates a false equivalence
> between domain name and DoH service.  You can only ever have one DoH
> service for a given host if you choose this mechanism.  Using DNS like
> this means that the choice is made for the name as a whole and not as
> part of the proposed host configuration.  For me, I'd prefer something
> more explicit in the RA/DHCP/etc...


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From: <mohamed.boucadair@orange.com>
To: Ian Maddison <ian@mad.paris>, Vittorio Bertola <vittorio.bertola=40open-xchange.com@dmarc.ietf.org>, ADD Mailing list <add@ietf.org>
Thread-Topic: [Add] I-D Action: draft-btw-add-home-00.txt
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Date: Tue, 10 Mar 2020 13:21:18 +0000
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Subject: Re: [Add] I-D Action: draft-btw-add-home-00.txt
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Hi Ian, Vittorio,

What you are both saying is exactly why handling user consent is a more gen=
eral point, not specific to this draft.

That is why we went with the following in the draft:

   The use of DoH/DoT also depends on the user's policies.  For example,

   the user may indicate his/her consent to use (or not) the locally-

   discovered DoH/DoT server or request to review human-readable privacy

   policy information of a selected DNS server to assess whether that

   DNS server performs DNS-based content filtering (e.g.,

   [I-D.reddy-dprive-dprive-privacy-policy<https://tools.ietf.org/html/draf=
t-btw-add-home-03#ref-I-D.reddy-dprive-dprive-privacy-policy>]).  The DNS c=
lient is assumed

   to adhere to these policies.  This document does not make any

   assumption about the structure of such policies nor mandates specific

   requirements.  Such policies and their handling is out of scope.

Cheers,
Med

De : Add [mailto:add-bounces@ietf.org] De la part de Ian Maddison
Envoy=E9 : mardi 10 mars 2020 12:08
=C0 : Vittorio Bertola; ADD Mailing list
Objet : Re: [Add] I-D Action: draft-btw-add-home-00.txt

Hi Vittorio,

On Tue, 10 Mar 2020, at 11:18, Vittorio Bertola wrote:

On the other hand, if the consent is tied to the degree of channel security=
 that is offered, then indeed the switch of channel might affect the user's=
 desire to consent. Still, if we can assume that DoT/DoH towards the same o=
perator always offers more security than Do53, and that the user has alread=
y consented to Do53, then we can also assume that the user will be happy wi=
th DoT/DoH as well.

That sounds fine until you consider the probable DNS performance degradatio=
n of DoT/DoH compared to Do53. Perhaps users prefer to give prior consent t=
o anything that affects their performance. Apologies if this isn't currentl=
y in scope, but nonetheless I feel it would be wise to also consider DNS pe=
rformance aspects here.

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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">Hi Ian, Vittorio,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">What you are both saying is exactly why hand=
ling user consent is a more general point, not specific to this draft.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">That is why we went with the following in th=
e draft:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p></o:p></span></p>
<pre>&nbsp;&nbsp;&nbsp;The use of DoH/DoT also depends on the user's polici=
es.&nbsp; For example,<o:p></o:p></pre>
<pre>&nbsp;&nbsp; the user may indicate his/her consent to use (or not) the=
 locally-<o:p></o:p></pre>
<pre>&nbsp;&nbsp; discovered DoH/DoT server or request to review human-read=
able privacy<o:p></o:p></pre>
<pre>&nbsp;&nbsp; policy information of a selected DNS server to assess whe=
ther that<o:p></o:p></pre>
<pre>&nbsp;&nbsp; DNS server performs DNS-based content filtering (e.g.,<o:=
p></o:p></pre>
<pre>&nbsp;&nbsp; [<a href=3D"https://tools.ietf.org/html/draft-btw-add-hom=
e-03#ref-I-D.reddy-dprive-dprive-privacy-policy" title=3D"&quot;DNS Server =
Privacy Statement and Filtering Policy with Assertion Token&quot;">I-D.redd=
y-dprive-dprive-privacy-policy</a>]).&nbsp; The DNS client is assumed<o:p><=
/o:p></pre>
<pre>&nbsp;&nbsp; to adhere to these policies.&nbsp; This document does not=
 make any<o:p></o:p></pre>
<pre>&nbsp;&nbsp; assumption about the structure of such policies nor manda=
tes specific<o:p></o:p></pre>
<pre>&nbsp;&nbsp; requirements.&nbsp; Such policies and their handling is o=
ut of scope.<o:p></o:p></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D">Med<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Co=
urier New&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"FR" style=3D"font-size:10.0pt;font-=
family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">De&nbsp;:</span></b><span=
 lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot=
;sans-serif&quot;"> Add [mailto:add-bounces@ietf.org]
<b>De la part de</b> Ian Maddison<br>
<b>Envoy=E9&nbsp;:</b> mardi 10 mars 2020 12:08<br>
<b>=C0&nbsp;:</b> Vittorio Bertola; ADD Mailing list<br>
<b>Objet&nbsp;:</b> Re: [Add] I-D Action: draft-btw-add-home-00.txt<o:p></o=
:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,&quot=
;sans-serif&quot;;color:mediumblue">Hi Vittorio,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,&quot=
;sans-serif&quot;;color:mediumblue"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,&quot=
;sans-serif&quot;;color:mediumblue">On Tue, 10 Mar 2020, at 11:18, Vittorio=
 Bertola wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt" id=3D"qt">
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">On the other hand, if the consent is tied to the deg=
ree of channel security that is offered, then indeed the switch of channel =
might affect the user's desire to consent. Still, if we can assume that DoT=
/DoH towards the same operator always
 offers more security than Do53, and that the user has already consented to=
 Do53, then we can also assume that the user will be happy with DoT/DoH as =
well.
<o:p></o:p></p>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,&quot=
;sans-serif&quot;;color:mediumblue"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Verdana&quot;,&quot=
;sans-serif&quot;;color:mediumblue">That sounds fine until you consider the=
 probable DNS performance degradation of DoT/DoH compared to Do53. Perhaps =
users prefer to give prior consent to anything that affects
 their performance. Apologies if this isn't currently in scope, but nonethe=
less I feel it would be wise to also consider DNS performance aspects here.=
<o:p></o:p></span></p>
</div>
</div>
</div>
</body>
</html>

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Date: Tue, 10 Mar 2020 14:31:23 +0100 (CET)
From: Vittorio Bertola <vittorio.bertola@open-xchange.com>
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Subject: Re: [Add] I-D Action: draft-btw-add-home-00.txt
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>     Il 10/03/2020 14:21 mohamed.boucadair@orange.com ha scritto:
> 
> 
> 
>     Hi Ian, Vittorio,
> 
>      
> 
>     What you are both saying is exactly why handling user consent is a more general point, not specific to this draft.
> 
I was actually wondering whether a non-technical draft devoted to framing and discussing issues of consent and privacy in the selection of DNS resolvers, as part of the third point of the charter, would be useful - or whether it would just prompt circular talk. In case, it should be written by/with policy people and privacy experts (there are several in DPRIVE and HRPC already).

--

Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
vittorio.bertola@open-xchange.com mailto:vittorio.bertola@open-xchange.com 
Office @ Via Treviso 12, 10144 Torino, Italy

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    Il 10/03/2020 14:21 mohamed.boucadair@orange.com ha scritto:
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    <p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Courier New'; color: #1f497d;">Hi Ian, Vittorio,</span></p>
    <p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Courier New'; color: #1f497d;">&nbsp;</span></p>
    <p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Courier New'; color: #1f497d;">What you are both saying is exactly why handling user consent is a more general point, not specific to this draft.</span></p>
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   I was actually wondering whether a non-technical draft devoted to framing and discussing issues of consent and privacy in the selection of DNS resolvers, as part of the third point of the charter, would be useful - or whether it would just prompt circular talk. In case, it should be written by/with policy people and privacy experts (there are several in DPRIVE and HRPC already).
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   <p>-- <br class=""></p>
   <pre class="">Vittorio Bertola | Head of Policy &amp; Innovation, Open-Xchange<br><a href="mailto:vittorio.bertola@open-xchange.com">vittorio.bertola@open-xchange.com</a> <br>Office @ Via Treviso 12, 10144 Torino, Italy</pre>
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To: Vittorio Bertola <vittorio.bertola@open-xchange.com>, "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, ADD Mailing list <add@ietf.org>
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Message-ID: <71ea074e-a6c6-46c7-d6c3-8485c516847a@cs.tcd.ie>
Date: Tue, 10 Mar 2020 14:30:31 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/add/UoAndBj07Dn4KREomB_KSeqhYw0>
Subject: Re: [Add] I-D Action: draft-btw-add-home-00.txt
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: Vittorio Bertola <vittorio.bertola=40open-xchange.com@dmarc.ietf.org>,
 mohamed.boucadair@orange.com, ADD Mailing list <add@ietf.org>
Message-ID: <71ea074e-a6c6-46c7-d6c3-8485c516847a@cs.tcd.ie>
Subject: Re: [Add] I-D Action: draft-btw-add-home-00.txt
References: <158330934617.29404.4287578882183435520@ietfa.amsl.com>
 <787AE7BB302AE849A7480A190F8B93303145E6CC@OPEXCAUBMA2.corporate.adroot.infra.ftgroup>
 <MW2PR00MB0410F2E1D3575DD07752082AFAE30@MW2PR00MB0410.namprd00.prod.outlook.com>
 <787AE7BB302AE849A7480A190F8B933031463FFC@OPEXCAUBMA2.corporate.adroot.infra.ftgroup>
 <1659773937.38028.1583835522817@appsuite-gw2.open-xchange.com>
 <0cd22a55-305f-42ec-a152-64bb5b9910a2@www.fastmail.com>
 <787AE7BB302AE849A7480A190F8B933031467531@OPEXCAUBMA2.corporate.adroot.infra.ftgroup>
 <1036080957.46703.1583847083548@appsuite-gw1.open-xchange.com>
In-Reply-To: <1036080957.46703.1583847083548@appsuite-gw1.open-xchange.com>

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On 10/03/2020 13:31, Vittorio Bertola wrote:
> I was actually wondering whether a non-technical draft devoted to
> framing and discussing issues of consent ... in the selection
> of DNS resolvers,

I think that's a terrible idea. It'd be pointless because
there is no meaningful consent involved - if people do not
know that the DNS exists they cannot reasonably be asked
for any real consent about it. This kind of fiction is used
by organisations of all kinds in the tech industry
generally and the web to fool users and nothing else (IMO).

See also Steve Bellovin's recent IETF plenary talk on why
all the "consent" stuff is nonsensical.

I do think there could be scope for an IETF document that
says "people can't consent to things they don't understand
about the Internet" and that could even be a useful BCP
("IETF specifications MUST NOT discuss user consent as that
is fictional because..."). However I doubt we'd get rough
consensus for that. (It's tempting to try though:-) And
that's definitely not in scope for this WG.

(I elided "and privacy" in my quote from Vittorio above,
because documenting those issues seems fine to me.)

Cheers,
S.



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To: ADD Mailing list <add@ietf.org>
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--_000_1864A763EC85468FA0E87B391B54C5F6nbcunicom_--


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Date: Wed, 11 Mar 2020 16:05:19 +1100
From: "Martin Thomson" <mt@lowentropy.net>
To: "mohamed.boucadair" <mohamed.boucadair@orange.com>, "add@ietf.org" <add@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/add/YIQUXzfYyAUJux1_qy4arZkjWjY>
Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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On Tue, Mar 10, 2020, at 23:58, mohamed.boucadair@orange.com wrote:
> (1) For example, the domain name provided in RA/DHCP will be used to 
> retrieve supported DoH services following methods such as those in 
> draft-ietf-doh-resolver-associated-doh.

I note that you proposed yet another method for resolution in addition to the three in that document.  Given the plethora of options we have, with no principles driving our decision-making process, it might be time for us to collectively determine what those principles might be.

> I see some advantages in 
> restricting the information to be conveyed by the network to a domain 
> name and a of IP addresses as we don't need a change to the network 
> configuration to reflect a change of DoH services. 

I see only the disadvantages inherent in splitting the configuration between different domains.

I know that grovelling around in DHCP/RA can be a nightmare (especially for ISPs who might be faced with outdated CPE), but once you accept the need to do that, it's not that much harder to ensure all the configuration is there.  Besides, you shouldn't need to change the URL often: https://www.w3.org/Provider/Style/URI

> (2) RFC8484 defines only a single variable "dns" but future specs can 
> define other URI templates with other variables: How validation will be 
> done by DHCP clients? Or should DHCP clients "blindly" pass that 
> templates to DoH clients that will proceed with the validation?

I think that can easy.  URI templates generally tolerate the addition of new field well.  If someone adds {?disable-dnssec} to the template and you don't know how to generate that, then you don't need to add it and everything works out.  You can build templates that don't work in the presence of extensions, but that is something we can manage as we add extensions.


From nobody Tue Mar 10 23:28:41 2020
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From: Erik Kline <ek.ietf@gmail.com>
Date: Tue, 10 Mar 2020 23:28:03 -0700
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To: Martin Thomson <mt@lowentropy.net>
Cc: "mohamed.boucadair" <mohamed.boucadair@orange.com>, "add@ietf.org" <add@ietf.org>
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Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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On Tue, Mar 10, 2020 at 10:05 PM Martin Thomson <mt@lowentropy.net> wrote:

> On Tue, Mar 10, 2020, at 23:58, mohamed.boucadair@orange.com wrote:
> > (1) For example, the domain name provided in RA/DHCP will be used to
> > retrieve supported DoH services following methods such as those in
> > draft-ietf-doh-resolver-associated-doh.
>
> I note that you proposed yet another method for resolution in addition to
> the three in that document.  Given the plethora of options we have, with no
> principles driving our decision-making process, it might be time for us to
> collectively determine what those principles might be.
>

Without even trying to be complete, I'd offer that requirements should
probably include:

    * allowing clients to bootstrap to encrypted DNS in the fewest
exchanges practical
    * recognize that modern clients have to detect and pass any captive
portals and that this may sometimes/often/always-in-practice require Do53
    * support Provisioning Domains specifically and fate-sharing generally
[1]

[1] imagine two RAs from two different ISPs on the same LAN segment; a
client may have to make consistent use of the RA information to use any
encrypted DNS info within that RA

> I see some advantages in
> > restricting the information to be conveyed by the network to a domain
> > name and a of IP addresses as we don't need a change to the network
> > configuration to reflect a change of DoH services.
>
> I see only the disadvantages inherent in splitting the configuration
> between different domains.
>
> I know that grovelling around in DHCP/RA can be a nightmare (especially
> for ISPs who might be faced with outdated CPE), but once you accept the
> need to do that, it's not that much harder to ensure all the configuration
> is there.  Besides, you shouldn't need to change the URL often:
> https://www.w3.org/Provider/Style/URI
>
> > (2) RFC8484 defines only a single variable "dns" but future specs can
> > define other URI templates with other variables: How validation will be
> > done by DHCP clients? Or should DHCP clients "blindly" pass that
> > templates to DoH clients that will proceed with the validation?
>
> I think that can easy.  URI templates generally tolerate the addition of
> new field well.  If someone adds {?disable-dnssec} to the template and you
> don't know how to generate that, then you don't need to add it and
> everything works out.  You can build templates that don't work in the
> presence of extensions, but that is something we can manage as we add
> extensions.
>
> --
> Add mailing list
> Add@ietf.org
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>

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Tue, Mar 10, 2020 at 10:05 PM Mart=
in Thomson &lt;<a href=3D"mailto:mt@lowentropy.net">mt@lowentropy.net</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Tue=
, Mar 10, 2020, at 23:58, <a href=3D"mailto:mohamed.boucadair@orange.com" t=
arget=3D"_blank">mohamed.boucadair@orange.com</a> wrote:<br>
&gt; (1) For example, the domain name provided in RA/DHCP will be used to <=
br>
&gt; retrieve supported DoH services following methods such as those in <br=
>
&gt; draft-ietf-doh-resolver-associated-doh.<br>
<br>
I note that you proposed yet another method for resolution in addition to t=
he three in that document.=C2=A0 Given the plethora of options we have, wit=
h no principles driving our decision-making process, it might be time for u=
s to collectively determine what those principles might be.<br></blockquote=
><div><br></div><div>Without even trying to be complete, I&#39;d offer that=
 requirements should probably include:</div><div><br></div><div>=C2=A0 =C2=
=A0 * allowing=C2=A0clients to bootstrap to encrypted DNS in the fewest exc=
hanges practical</div><div>=C2=A0 =C2=A0 * recognize that modern clients ha=
ve to detect and pass any captive portals and that this may sometimes/often=
/always-in-practice require Do53</div><div>=C2=A0 =C2=A0 * support Provisio=
ning Domains specifically and fate-sharing generally [1]</div><div><br></di=
v><div>[1] imagine two RAs from two different ISPs on the same LAN segment;=
 a client may have to make consistent use of the RA information to use any =
encrypted DNS info within that RA</div><div><br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex">
&gt; I see some advantages in <br>
&gt; restricting the information to be conveyed by the network to a domain =
<br>
&gt; name and a of IP addresses as we don&#39;t need a change to the networ=
k <br>
&gt; configuration to reflect a change of DoH services. <br>
<br>
I see only the disadvantages inherent in splitting the configuration betwee=
n different domains.<br>
<br>
I know that grovelling around in DHCP/RA can be a nightmare (especially for=
 ISPs who might be faced with outdated CPE), but once you accept the need t=
o do that, it&#39;s not that much harder to ensure all the configuration is=
 there.=C2=A0 Besides, you shouldn&#39;t need to change the URL often: <a h=
ref=3D"https://www.w3.org/Provider/Style/URI" rel=3D"noreferrer" target=3D"=
_blank">https://www.w3.org/Provider/Style/URI</a><br>
<br>
&gt; (2) RFC8484 defines only a single variable &quot;dns&quot; but future =
specs can <br>
&gt; define other URI templates with other variables: How validation will b=
e <br>
&gt; done by DHCP clients? Or should DHCP clients &quot;blindly&quot; pass =
that <br>
&gt; templates to DoH clients that will proceed with the validation?<br>
<br>
I think that can easy.=C2=A0 URI templates generally tolerate the addition =
of new field well.=C2=A0 If someone adds {?disable-dnssec} to the template =
and you don&#39;t know how to generate that, then you don&#39;t need to add=
 it and everything works out.=C2=A0 You can build templates that don&#39;t =
work in the presence of extensions, but that is something we can manage as =
we add extensions.<br>
<br>
-- <br>
Add mailing list<br>
<a href=3D"mailto:Add@ietf.org" target=3D"_blank">Add@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/add" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/add</a><br>
</blockquote></div></div>

--00000000000058534205a08e579c--


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From: <mohamed.boucadair@orange.com>
To: Vittorio Bertola <vittorio.bertola=40open-xchange.com@dmarc.ietf.org>, "ADD Mailing list" <add@ietf.org>
Thread-Topic: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Hi Vittorio,=20

Please see inline.=20

Cheers,
Med

> -----Message d'origine-----
> De=A0: Add [mailto:add-bounces@ietf.org] De la part de Vittorio Bertola
> Envoy=E9=A0: mardi 10 mars 2020 11:00
> =C0=A0: Stephen Farrell; ADD Mailing list
> Objet=A0: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
>=20
>=20
>=20
> > Il 09/03/2020 14:05 Stephen Farrell <stephen.farrell@cs.tcd.ie> ha
> scritto:
> >
> > But my main comment is that the home router that does
> > almost all DNS might not be provided by the ISP so any
> > discovery or similar protocol ought not make that
> > assumption. I recognise that that's a corner-case
>=20
> Yes, it's an infrequent case, but I would not call it a corner case.
> At least in Europe, there is regulation that requires all ISPs to
> allow users to buy and deploy any CPE they like.

[Med] Agree (assuming the CPE is compliant with the technical specification=
 to access the service published by providers).

Unmanaged CPEs can use the DNS configuration supplied by the network or the=
 user can change that configuration to point to a public resolver. This is =
similar to what is already discussed in the draft:

   Some ISPs rely upon external resolvers (e.g., outsourced service or
   public resolvers); these ISPs provide their customers with the IP
   addresses of these resolvers.  These addresses are typically
   configured on CPEs using the same mechanisms listed above.  Likewise,
   users can modify the default DNS configuration of their CPEs (e.g.,
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   supplied by their ISP) to configure their favorite DNS servers.  This
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   document permits such deployments.

I updated the draft to make this explicit. You may check at: https://github=
.com/boucadair/draft-btw-add-home-network/blob/master/draft-btw-add-home-03=
.txt=20

   3.  Sample Deployment Scenarios . . . . . . . . . . . . . . . . .   4
     3.1.  Managed CPEs  . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Unmanaged CPEs  . . . . . . . . . . . . . . . . . . . . .   7

Do we need to say more? Thanks.=20

 Also, it is
> relatively common, for smart users that couldn't get their ISP to do
> without the CPE, to deploy another router in front (LAN-side) of the
> CPE. This happens, for example, because the CPE has the appropriate
> fiber termination but the user's desired home router has not, but has
> other features that the user needs. So indeed these are use cases that
> have to be supported.

[Med] If the internal CPE does not embed a forwarder, that CPE "relays" the=
 DNS information received from the ISP-supplied CPE or use the one set by t=
he user. From a DNS standpoint, this is similar to the scenario above.=20

If the internal CPE embeds a forwarder, the procedure we define for bootstr=
apping with an ISP DoH server + redirection to the forwarder on the CPE doe=
s not apply (Section 7 of the I-D).=20

Considerations such as those discussed in Section 5.2 will need to be follo=
wed by the host/user. Assuming that setup, the internal CPE can use the opt=
ions defined in the draft (if it supports them) to announce itself as a DoH=
 resolver. Of course, if the user assigns a static address to the internal =
CPE, it can configure that @ directly on the hosts. Discovery is thus not r=
elevant in such case.=20

I'm afraid that we are getting into very specific setups. I suggest to leav=
e this one out for the moment and focus on the scenarios that require less =
involvement from the user.=20

What do you think?=20


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From: <mohamed.boucadair@orange.com>
To: Martin Thomson <mt@lowentropy.net>, "add@ietf.org" <add@ietf.org>
Thread-Topic: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Date: Wed, 11 Mar 2020 10:11:33 +0000
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Subject: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Hi Martin,

Please see inline.

Cheers,
Med

> -----Message d'origine-----
> De=A0: Martin Thomson [mailto:mt@lowentropy.net]
> Envoy=E9=A0: mercredi 11 mars 2020 06:05
> =C0=A0: BOUCADAIR Mohamed TGI/OLN; add@ietf.org
> Objet=A0: Re: [Add] TR: I-D Action: draft-btw-add-home-00.txt
>=20
> On Tue, Mar 10, 2020, at 23:58, mohamed.boucadair@orange.com wrote:
> > (1) For example, the domain name provided in RA/DHCP will be used to
> > retrieve supported DoH services following methods such as those in
> > draft-ietf-doh-resolver-associated-doh.
>=20
> I note that you proposed yet another method for resolution in addition
> to the three in that document.  Given the plethora of options we have,
> with no principles driving our decision-making process, it might be
> time for us to collectively determine what those principles might be.

[Med] Indeed, this is what I meant by "we need to think about the overall m=
odel".

>=20
> > I see some advantages in
> > restricting the information to be conveyed by the network to a
> domain
> > name and a of IP addresses as we don't need a change to the network
> > configuration to reflect a change of DoH services.
>=20
> I see only the disadvantages inherent in splitting the configuration
> between different domains.
>=20
> I know that grovelling around in DHCP/RA can be a nightmare
> (especially for ISPs who might be faced with outdated CPE), but once
> you accept the need to do that, it's not that much harder to ensure
> all the configuration is there.  Besides, you shouldn't need to change
> the URL often: https://www.w3.org/Provider/Style/URI

[Med] ... but still the design should allow for new services to be defined =
and others withdrawn.=20

Things may be "easy" to manage when both the connectivity and the supplied =
DNS server are managed by the same ISP, but that is not the case if the ISP=
 relies on a third party service or the user changes the config to point to=
, e.g., ContainerPI:=20

* unfiltered: https://dns.containerpi.com/dns-query
* Filtered, blocks adult content: https://dns.containerpi.com/doh/family-fi=
lter/
* Filtered, blocks malicious domains only: https://dns.containerpi.com/doh/=
secure-filter/

If a new service is added to that list (e.g., https://dns.containerpi.com/d=
oh/secure-family-filter/) or some of them are removed, there is a need to c=
oordinate ** out-of-band ** in order to maintain the configuration supplied=
 to the customers up to date. At least in this example, it is suboptimal to=
 "split the configuration between different domains." (ISP vs. DNS provider=
).

>=20
> > (2) RFC8484 defines only a single variable "dns" but future specs
> can
> > define other URI templates with other variables: How validation will
> be
> > done by DHCP clients? Or should DHCP clients "blindly" pass that
> > templates to DoH clients that will proceed with the validation?
>=20
> I think that can easy.  URI templates generally tolerate the addition
> of new field well.  If someone adds {?disable-dnssec} to the template
> and you don't know how to generate that, then you don't need to add it
> and everything works out.  You can build templates that don't work in
> the presence of extensions, but that is something we can manage as we
> add extensions.

[Med] Practically, we can't guarantee that because we don't know how these =
extensions will be defined. I would like to avoid requiring an update to th=
e DHCP/RA uri validation code in order to support new extensions.=20


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> Il 11/03/2020 10:03 mohamed.boucadair@orange.com ha scritto:
> 
> [Med] If the internal CPE does not embed a forwarder, that CPE "relays" the DNS information received from the ISP-supplied CPE or use the one set by the user. From a DNS standpoint, this is similar to the scenario above. 
> 
> If the internal CPE embeds a forwarder, the procedure we define for bootstrapping with an ISP DoH server + redirection to the forwarder on the CPE does not apply (Section 7 of the I-D). 
> 
> Considerations such as those discussed in Section 5.2 will need to be followed by the host/user. Assuming that setup, the internal CPE can use the options defined in the draft (if it supports them) to announce itself as a DoH resolver. Of course, if the user assigns a static address to the internal CPE, it can configure that @ directly on the hosts. Discovery is thus not relevant in such case. 
> 
> I'm afraid that we are getting into very specific setups. I suggest to leave this one out for the moment and focus on the scenarios that require less involvement from the user. 
> 
> What do you think?

I think we could mention the use case and make sure that it is not prevented by the architecture we design, assuming that the user is smart (these are not "basic user" situations) and needs to actively configure his/her devices. For the rest, I agree that this is not a priority.

-- 
 
Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
vittorio.bertola@open-xchange.com 
Office @ Via Treviso 12, 10144 Torino, Italy


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From: <mohamed.boucadair@orange.com>
To: Vittorio Bertola <vittorio.bertola@open-xchange.com>, ADD Mailing list <add@ietf.org>
Thread-Topic: [EXT] RE: [Add] TR: I-D Action: draft-btw-add-home-00.txt
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Date: Fri, 13 Mar 2020 09:33:17 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/add/QsD3f-dEHtWCobM5TuEF_XXzqjo>
Subject: [Add] add - Requested session has been scheduled for IETF 107
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Dear Amy Vezza,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    add Session 1 (2:00 requested)
    Tuesday, 24 March 2020, Session I 2000-2200
    Room Name: Virtual Track 1 size: None
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/107/sessions/add.ics

Request Information:


---------------------------------------------------------
Working Group Name: Adaptive DNS Discovery
Area Name: Internet Area
Session Requester: Amy Vezza

Number of Sessions: 1
Length of Session(s):  2 Hours
Number of Attendees: 100
Conflicts to Avoid: 

 Technology Overlap: capport dhc dnsop doh dprive opsawg mops wpack



People who must be present:
  Barry Leiba
  Glenn Deen
  David C Lawrence

Resources Requested:

Special Requests:
  
---------------------------------------------------------



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From: <mohamed.boucadair@orange.com>
To: "ADD Mailing list (add@ietf.org)" <add@ietf.org>
Thread-Topic: New Version Notification for draft-btw-add-home-04.txt
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Date: Mon, 16 Mar 2020 13:11:41 +0000
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To: Iain Sharp <isharp@atis.org>, "ADD Mailing list (add@ietf.org)" <add@ietf.org>
Thread-Topic: New Version Notification for draft-btw-add-home-04.txt
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From: Iain Sharp <isharp@atis.org>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "ADD Mailing list (add@ietf.org)" <add@ietf.org>
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To: Iain Sharp <isharp@atis.org>, "ADD Mailing list (add@ietf.org)" <add@ietf.org>
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To: Iain Sharp <isharp@atis.org>, "ADD Mailing list (add@ietf.org)" <add@ietf.org>
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Subject: Re: [Add] New Version Notification for draft-btw-add-home-04.txt
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To: Iain Sharp <isharp@atis.org>, "ADD Mailing list (add@ietf.org)" <add@ietf.org>
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From: tirumal reddy <kondtir@gmail.com>
Date: Thu, 19 Mar 2020 12:32:59 +0530
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Subject: [Add] Fwd: New Version Notification for draft-reddy-add-server-policy-selection-00.txt
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--00000000000002821c05a12fc3db
Content-Type: text/plain; charset="UTF-8"

https://tools.ietf.org/html/draft-reddy-add-server-policy-selection-00
defines a mechanism that allows communication of DNS resolver information
to DNS clients for use in selection decisions. It defines a mechanism for a
DNS server to communicate its filtering policy and privacy statement URL to
DNS clients. This information is cryptographically signed to attest
its authenticity.

Comments and suggestions are more than welcome.

Cheers,
-Tiru

---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Thu, 19 Mar 2020 at 10:03
Subject: New Version Notification for
draft-reddy-add-server-policy-selection-00.txt
To: Dan Wing <dwing-ietf@fuggles.com>, Tirumaleswar Reddy.K <
kondtir@gmail.com>, Michael C. Richardson <mcr+ietf@sandelman.ca>, Mohamed
Boucadair <mohamed.boucadair@orange.com>



A new version of I-D, draft-reddy-add-server-policy-selection-00.txt
has been successfully submitted by Tirumaleswar Reddy and posted to the
IETF repository.

Name:           draft-reddy-add-server-policy-selection
Revision:       00
Title:          DNS Server Selection: DNS Server Information with Assertion
Token
Document date:  2020-03-18
Group:          Individual Submission
Pages:          22
URL:
https://www.ietf.org/internet-drafts/draft-reddy-add-server-policy-selection-00.txt
Status:
https://datatracker.ietf.org/doc/draft-reddy-add-server-policy-selection/
Htmlized:
https://tools.ietf.org/html/draft-reddy-add-server-policy-selection-00
Htmlized:
https://datatracker.ietf.org/doc/html/draft-reddy-add-server-policy-selection


Abstract:
   The document defines a mechanism that allows communication of DNS
   resolver information to DNS clients for use in selection decisions.
   In particuler, the document defines a mechanism for a DNS server to
   communicate its filtering policy and its privacy statement URL to DNS
   clients.  This information is cryptographically signed to attest its
   authenticity.  Such information is used for the selection of DNS
   resolvers.  Typically, evaluating the DNS privacy statement,
   filtering policy, and the signatory, DNS clients with minimum human
   intervention can select the DNS server that best supports the user's
   desired privacy and filtering policy.

   This assertion is useful for DNS-over-TLS and DNS-over-HTTPS servers
   that are either public resolvers or are discovered on a local
   network.




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.

The IETF Secretariat

--00000000000002821c05a12fc3db
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><a href=3D"https://tools.ietf.org/html/draft-reddy-add-ser=
ver-policy-selection-00">https://tools.ietf.org/html/draft-reddy-add-server=
-policy-selection-00</a> defines a mechanism that allows communication of D=
NS resolver information to DNS clients for use in selection decisions.=C2=
=A0It defines a mechanism for a DNS server to communicate its filtering pol=
icy and privacy statement URL to DNS clients. This information is cryptogra=
phically signed to attest its=C2=A0authenticity. <br><br>Comments and sugge=
stions are more than welcome.<br><br>Cheers,<br>-Tiru<br><br><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">---------- Forwarded mes=
sage ---------<br>From: <span dir=3D"auto">&lt;<a href=3D"mailto:internet-d=
rafts@ietf.org">internet-drafts@ietf.org</a>&gt;</span><br>Date: Thu, 19 Ma=
r 2020 at 10:03<br>Subject: New Version Notification for draft-reddy-add-se=
rver-policy-selection-00.txt<br>To: Dan Wing &lt;<a href=3D"mailto:dwing-ie=
tf@fuggles.com">dwing-ietf@fuggles.com</a>&gt;, Tirumaleswar Reddy.K &lt;<a=
 href=3D"mailto:kondtir@gmail.com">kondtir@gmail.com</a>&gt;, Michael C. Ri=
chardson &lt;<a href=3D"mailto:mcr%2Bietf@sandelman.ca">mcr+ietf@sandelman.=
ca</a>&gt;, Mohamed Boucadair &lt;<a href=3D"mailto:mohamed.boucadair@orang=
e.com">mohamed.boucadair@orange.com</a>&gt;<br></div><br><br><br>
A new version of I-D, draft-reddy-add-server-policy-selection-00.txt<br>
has been successfully submitted by Tirumaleswar Reddy and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-reddy-add-server-policy=
-selection<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 DNS Server Selection: DNS Server I=
nformation with Assertion Token<br>
Document date:=C2=A0 2020-03-18<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 22<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-reddy-add-server-policy-selection-00.txt" rel=3D"n=
oreferrer" target=3D"_blank">https://www.ietf.org/internet-drafts/draft-red=
dy-add-server-policy-selection-00.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-reddy-add-server-policy-selection/" rel=3D"noreferrer" targ=
et=3D"_blank">https://datatracker.ietf.org/doc/draft-reddy-add-server-polic=
y-selection/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-reddy-add-server-policy-selection-00" rel=3D"noreferrer" target=3D"_b=
lank">https://tools.ietf.org/html/draft-reddy-add-server-policy-selection-0=
0</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-reddy-add-server-policy-selection" rel=3D"noreferrer" targe=
t=3D"_blank">https://datatracker.ietf.org/doc/html/draft-reddy-add-server-p=
olicy-selection</a><br>
<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0The document defines a mechanism that allows communication of =
DNS<br>
=C2=A0 =C2=A0resolver information to DNS clients for use in selection decis=
ions.<br>
=C2=A0 =C2=A0In particuler, the document defines a mechanism for a DNS serv=
er to<br>
=C2=A0 =C2=A0communicate its filtering policy and its privacy statement URL=
 to DNS<br>
=C2=A0 =C2=A0clients.=C2=A0 This information is cryptographically signed to=
 attest its<br>
=C2=A0 =C2=A0authenticity.=C2=A0 Such information is used for the selection=
 of DNS<br>
=C2=A0 =C2=A0resolvers.=C2=A0 Typically, evaluating the DNS privacy stateme=
nt,<br>
=C2=A0 =C2=A0filtering policy, and the signatory, DNS clients with minimum =
human<br>
=C2=A0 =C2=A0intervention can select the DNS server that best supports the =
user&#39;s<br>
=C2=A0 =C2=A0desired privacy and filtering policy.<br>
<br>
=C2=A0 =C2=A0This assertion is useful for DNS-over-TLS and DNS-over-HTTPS s=
ervers<br>
=C2=A0 =C2=A0that are either public resolvers or are discovered on a local<=
br>
=C2=A0 =C2=A0network.<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
<br>
<br>
</div></div>

--00000000000002821c05a12fc3db--


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ADD Session at IETF 107

Tuesday, March 24, 2020 
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IETF 107 Agenda: <https://datatracker.ietf.org/meeting/107/agenda>


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Date: Fri, 20 Mar 2020 18:22:06 +0000
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To: Ted Hardie <ted.ietf@gmail.com>
Cc: ADD Mailing list <add@ietf.org>, Jari Arkko <jari.arkko@piuha.net>,  Martin Thomson <mt@lowentropy.net>
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Ted, Jari, Martin,

In preparation for the first presentation on Tuesday, I've had another look
through your draft and it's raised some questions in my mind.

Section 3 introduces the premise that the client selects a set of trusted
resolvers, excluding all less trusted ones. It doesn=E2=80=99t really say t=
his, but
I think each resolver in the set needs to be operated by a different party,
otherwise the activity seems to be pointless. Do you agree?

If you do, the premise implies the set must include at least one resolver
NOT operated by the provider of the local network.

We then get onto the problem briefly mentioned in section 6.2, namely
   different resolvers might have different policies with
   respect to blocking or filtering of queries that lead to clients
   receiving inconsistent answers

If I compare the above to the set of perspectives outlined in ICANN SAC109,
my expectation is that the resulting net change in the ability to meet
their needs is as follows:

4.1 (Parents):  Negative
4.2 (Enterprise Network Managers):  Negative
4.3 (Dissidents, Protesters and Others):  Positive
4.4 (Internet Service Providers):  Negative

Would you agree with this assessment? Or have I missed something crucial?

I'm normally optimistic so let's assume there is a way to mitigate the
negatives. Let=E2=80=99s now focus on whether the impact to privacy is alwa=
ys
positive. I think there is a case where it may be weaker than the status
quo.

Imagine a normal residential home. This one has five different wifi
clients, with a single recursive resolver (A) outside the home, on the
internet. This is shown below (apologies to anyone reading the plain text
version).

[image: Normal.png]
Resolver A sees the merged traffic of all 5 clients, coming from a single
IP address.

With the client-based selection mode (section 4.1), and two resolvers
chosen (A and B), those resolvers can learn more data about the specific
clients:
[image: With two resolvers.png]
Of course A can individually separate clients 1, 3 and 5, because even
though they share an IP address, they've all set up separate TLS sessions.

Is this is a legitimate privacy issue?

I would be grateful for your thoughts, either on the list or during the
presentation on Tuesday. And if anyone on the list has a view, particularly
if there is a way to modify the text such that negative impacts can be
reduced, that would be most valuable.

Thanks,
Chris



On Tue, 25 Feb 2020 at 18:01, Ted Hardie <ted.ietf@gmail.com> wrote:

> Howdy,
>
> Jari, Martin, and I put together
> draft-arkko-abcd-distributed-resolver-selection
> <https://datatracker.ietf.org/doc/draft-arkko-abcd-distributed-resolver-s=
election/?include_text=3D1> to
> start a discussion on whether DNS clients can improve their privacy throu=
gh
> the use of a set of multiple recursive resolver services.  We think it
> might be in scope for ADD, since the charter says the group "will focus o=
n
> discovery and selection of DNS resolvers" and this discusses the impact o=
f
> selecting more than one.
>
> Do the chairs and the working group agree?  If so, can we ask for agenda
> time at IETF 107 to present?
>
> thanks,
>
> Ted
> --
> Add mailing list
> Add@ietf.org
> https://www.ietf.org/mailman/listinfo/add
>

--00000000000096fa1905a14d5deb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>Ted, Jari=
, Martin,</div><div><br></div><div>In preparation for the first presentatio=
n on Tuesday, I&#39;ve had another look through your draft and it&#39;s rai=
sed some questions in my mind.</div><div><br></div><div>Section 3=C2=A0intr=
oduces the premise that the client selects a set of trusted resolvers, excl=
uding all less trusted ones. It doesn=E2=80=99t really say this, but I thin=
k each resolver in the set needs to be operated by a different party, other=
wise the activity seems to be pointless. Do you agree?</div><div><br></div>=
<div>If you do, the premise implies the set must include at least one resol=
ver NOT operated by the provider of the local network.</div><div><br></div>=
<div>We then get onto the problem briefly mentioned in section 6.2, namely =
<br><font face=3D"monospace">=C2=A0=C2=A0 different resolvers might have di=
fferent policies with<br>=C2=A0=C2=A0 respect to blocking or filtering of q=
ueries that lead to clients<br>=C2=A0=C2=A0 receiving inconsistent answers<=
/font></div><div><font face=3D"monospace"></font><br></div><div>If I compar=
e the above to the set of perspectives outlined in ICANN SAC109, my expecta=
tion is that the resulting net change in the ability to meet their needs is=
 as follows:</div><div><br></div><div>4.1 (Parents):=C2=A0 Negative</div><d=
iv>4.2 (Enterprise Network Managers):=C2=A0 Negative</div><div>4.3 (Disside=
nts, Protesters and Others):=C2=A0 Positive</div><div>4.4 (Internet Service=
 Providers):=C2=A0 Negative</div><div><br></div><div>Would you agree with t=
his assessment? Or have I missed something crucial?</div><div><br></div><di=
v>I&#39;m normally optimistic so let&#39;s assume there is a way to mitigat=
e the negatives. Let=E2=80=99s now focus on whether the impact to privacy i=
s always positive. I think there is a case where it may be weaker than the =
status quo.</div><div><br></div><div>Imagine a normal residential home. Thi=
s one has five different wifi clients, with a single recursive resolver (A)=
 outside the home, on the internet. This is shown below (apologies to anyon=
e reading the plain text version).</div><div><br></div><div><div><img width=
=3D"554" height=3D"457" alt=3D"Normal.png" src=3D"cid:ii_k80hvuj50"><br></d=
iv>Resolver A sees the merged traffic of all 5 clients, coming from a singl=
e IP address.</div><div><br></div><div>With the client-based selection mode=
 (section 4.1), and two resolvers chosen (A and B), those resolvers can lea=
rn more data about the specific clients:<br></div><div><div><img width=3D"5=
54" height=3D"493" alt=3D"With two resolvers.png" src=3D"cid:ii_k80i10ac1">=
<br></div><b></b><i></i><u></u><sub></sub><sup></sup><strike></strike>Of co=
urse A can individually separate clients 1, 3 and 5, because even though th=
ey share an IP address, they&#39;ve all set up separate TLS sessions.</div>=
<div><br></div><div>Is this is a legitimate privacy issue?</div><div><br></=
div><div>I would be grateful for your thoughts, either on the list or durin=
g the presentation on Tuesday. And if anyone on the list has a view, partic=
ularly if there is a way to modify the text such that negative impacts can =
be reduced, that would be most valuable.</div><div><br></div><div>Thanks,</=
div><div>Chris</div><div><br></div><div><br></div><div>

</div></div></div></div></div></div></div></div><br><div class=3D"gmail_quo=
te"><div class=3D"gmail_attr" dir=3D"ltr">On Tue, 25 Feb 2020 at 18:01, Ted=
 Hardie &lt;<a href=3D"mailto:ted.ietf@gmail.com">ted.ietf@gmail.com</a>&gt=
; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px=
 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-=
width:1px;border-left-style:solid"><div dir=3D"ltr"><div>Howdy,</div><div><=
br></div><div>Jari, Martin, and I put together <a href=3D"https://datatrack=
er.ietf.org/doc/draft-arkko-abcd-distributed-resolver-selection/?include_te=
xt=3D1" target=3D"_blank">draft-arkko-abcd-distributed-resolver-selection</=
a> <font size=3D"2"><span style=3D"font-family:arial,sans-serif"><span styl=
e=3D"font-weight:normal">to start a discussion on whether DNS clients can i=
mprove their privacy through the use of a set of multiple recursive resolve=
r services.=C2=A0 We think it might be in scope for ADD, since the charter =
says the group &quot;will focus on discovery and selection of DNS resolvers=
&quot; and this discusses the impact of selecting more than one.=C2=A0 <br>=
</span></span></font></div><div><font size=3D"2"><span style=3D"font-family=
:arial,sans-serif"><span style=3D"font-weight:normal"><br></span></span></f=
ont></div><div><font size=3D"2"><span style=3D"font-family:arial,sans-serif=
"><span style=3D"font-weight:normal">Do the chairs and the working group ag=
ree?=C2=A0 If so, can we ask for agenda time at IETF 107 to present?=C2=A0 =
<br></span></span></font></div><div><font size=3D"2"><span style=3D"font-fa=
mily:arial,sans-serif"><span style=3D"font-weight:normal"><br></span></span=
></font></div><div><font size=3D"2"><span style=3D"font-family:arial,sans-s=
erif"><span style=3D"font-weight:normal">thanks,</span></span></font></div>=
<div><font size=3D"2"><span style=3D"font-family:arial,sans-serif"><span st=
yle=3D"font-weight:normal"><br></span></span></font></div><div><font size=
=3D"2"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-wei=
ght:normal">Ted<br></span></span></font></div></div>
-- <br>
Add mailing list<br>
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=3D"noreferrer">https://www.ietf.org/mailman/listinfo/add</a><br>
</blockquote></div></div>

--00000000000096fa1905a14d5deb--

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From: Ted Hardie <ted.ietf@gmail.com>
Date: Fri, 20 Mar 2020 14:23:37 -0700
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To: "Chris Box (BT)" <chris.box.ietf@gmail.com>
Cc: ADD Mailing list <add@ietf.org>, Jari Arkko <jari.arkko@piuha.net>,  Martin Thomson <mt@lowentropy.net>
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Subject: Re: [Add] draft-arkko-abcd-distributed-resolver-selection
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Hi Chris,

Thanks for the review.  Replies in-line.

On Fri, Mar 20, 2020 at 11:22 AM Chris Box (BT) <chris.box.ietf@gmail.com>
wrote:

> Ted, Jari, Martin,
>
> In preparation for the first presentation on Tuesday, I've had another
> look through your draft and it's raised some questions in my mind.
>
> Section 3 introduces the premise that the client selects a set of trusted
> resolvers, excluding all less trusted ones. It doesn=E2=80=99t really say=
 this, but
> I think each resolver in the set needs to be operated by a different part=
y,
> otherwise the activity seems to be pointless. Do you agree?
>
>
If you do, the premise implies the set must include at least one resolver
> NOT operated by the provider of the local network.
>

If you look at section 4.1, you'll see that one of the strategies is "to
distribute each different client to a different resolver."  If the client's
trusted set includes the local network resolver, it might well be
associated with that network.    Because this strategy is focused on the
aggregate distribution of DNS queries, there are a lot of cases where the
local network being trusted means the current association methods don't
actually change for some clients.


>
> We then get onto the problem briefly mentioned in section 6.2, namely
>    different resolvers might have different policies with
>    respect to blocking or filtering of queries that lead to clients
>    receiving inconsistent answers
>
>
If you put resolvers with different policies into the trusted set, that can
happen.  If the resolvers are transparent about their policies, this seems
less likely to happen, because you will put resolvers into the set only
when you are both confident of their privacy-preserving behavior and that
their policies match your desires.


> If I compare the above to the set of perspectives outlined in ICANN
> SAC109, my expectation is that the resulting net change in the ability to
> meet their needs is as follows:
>
> 4.1 (Parents):  Negative
> 4.2 (Enterprise Network Managers):  Negative
> 4.3 (Dissidents, Protesters and Others):  Positive
> 4.4 (Internet Service Providers):  Negative
>
> Would you agree with this assessment? Or have I missed something crucial?
>
>
I'm not familiar enough with SAC 109 to comment, so I'll leave that to
others.  My personal belief is that the ability to choose what resolvers
belong in the set is important enough that it should map to the client's
controller (which might be an individual, the parent of child, the
enterprise owner of an employee device).



> I'm normally optimistic so let's assume there is a way to mitigate the
> negatives. Let=E2=80=99s now focus on whether the impact to privacy is al=
ways
> positive. I think there is a case where it may be weaker than the status
> quo.
>
> Imagine a normal residential home. This one has five different wifi
> clients, with a single recursive resolver (A) outside the home, on the
> internet. This is shown below (apologies to anyone reading the plain text
> version).
>
> [image: Normal.png]
> Resolver A sees the merged traffic of all 5 clients, coming from a single
> IP address.
>
> With the client-based selection mode (section 4.1), and two resolvers
> chosen (A and B), those resolvers can learn more data about the specific
> clients:
> [image: With two resolvers.png]
> Of course A can individually separate clients 1, 3 and 5, because even
> though they share an IP address, they've all set up separate TLS sessions=
.
>
>
I find your graphic a bit confusing, because you are not treating the stub
resolver in the home router as if it were a part of the calculus here.  If
I understand things correctly, if those clients were actively choosing to
use a resolver here (rather than taking one by association), they would be
choosing the home router, rather than A (let's call the home router
resolver H).  They presumably believe H has policies that match the ones
they prefer; A is opaque to them.  But H sees the traffic of all five
clients; that's the common trade-off there.



> Is this is a legitimate privacy issue?
>
>
As I said, there are trade-offs here.  In any case where your query traffic
goes to a recursive resolver, the number of clients sharing that resolver
increases the anonymity set for traffic analyzed upstream of that
resolver.  In your first example, because your A is upstream of H, H's
clients get an anonymity set size of 5 with respect to A.  In your example
two, for traffic analyzed upstream of A or B, the anonymity set size is
likely to be much higher, but the tradeoff is that that A (or B) has a more
direct view of a larger number of clients.


> I would be grateful for your thoughts, either on the list or during the
> presentation on Tuesday. And if anyone on the list has a view, particular=
ly
> if there is a way to modify the text such that negative impacts can be
> reduced, that would be most valuable.
>
>
thanks again for the review,

Ted



> Thanks,
> Chris
>
>
>
> On Tue, 25 Feb 2020 at 18:01, Ted Hardie <ted.ietf@gmail.com> wrote:
>
>> Howdy,
>>
>> Jari, Martin, and I put together
>> draft-arkko-abcd-distributed-resolver-selection
>> <https://datatracker.ietf.org/doc/draft-arkko-abcd-distributed-resolver-=
selection/?include_text=3D1> to
>> start a discussion on whether DNS clients can improve their privacy thro=
ugh
>> the use of a set of multiple recursive resolver services.  We think it
>> might be in scope for ADD, since the charter says the group "will focus =
on
>> discovery and selection of DNS resolvers" and this discusses the impact =
of
>> selecting more than one.
>>
>> Do the chairs and the working group agree?  If so, can we ask for agenda
>> time at IETF 107 to present?
>>
>> thanks,
>>
>> Ted
>> --
>> Add mailing list
>> Add@ietf.org
>> https://www.ietf.org/mailman/listinfo/add
>>
>

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<div dir=3D"ltr"><div dir=3D"ltr"><div>Hi Chris,</div><div><br></div><div>T=
hanks for the review.=C2=A0 Replies in-line.<br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Mar 20, 2020=
 at 11:22 AM Chris Box (BT) &lt;<a href=3D"mailto:chris.box.ietf@gmail.com"=
>chris.box.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"=
><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div d=
ir=3D"ltr"><div>Ted, Jari, Martin,</div><div><br></div><div>In preparation =
for the first presentation on Tuesday, I&#39;ve had another look through yo=
ur draft and it&#39;s raised some questions in my mind.</div><div><br></div=
><div>Section 3=C2=A0introduces the premise that the client selects a set o=
f trusted resolvers, excluding all less trusted ones. It doesn=E2=80=99t re=
ally say this, but I think each resolver in the set needs to be operated by=
 a different party, otherwise the activity seems to be pointless. Do you ag=
ree?</div><div>=C2=A0</div></div></div></div></div></div></div></div></div>=
</blockquote><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"=
ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><d=
iv dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div></div><div>If you do,=
 the premise implies the set must include at least one resolver NOT operate=
d by the provider of the local network.</div></div></div></div></div></div>=
</div></div></div></blockquote><div><br></div><div><div>If you look at sect=
ion 4.1, you&#39;ll see that one of the strategies is &quot;to distribute e=
ach different client to a different resolver.&quot;=C2=A0 If the client&#39=
;s trusted set includes the local network resolver, it might well be associ=
ated with that network.=C2=A0=C2=A0=C2=A0 Because this strategy is focused =
on the aggregate distribution of DNS queries, there are a lot of cases wher=
e the local network being trusted means the current association methods don=
&#39;t actually change for some clients.<br></div></div><div>=C2=A0</div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div dir=
=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr=
"><div dir=3D"ltr"><div dir=3D"ltr"><div><br></div><div>We then get onto th=
e problem briefly mentioned in section 6.2, namely <br><font face=3D"monosp=
ace">=C2=A0=C2=A0 different resolvers might have different policies with<br=
>=C2=A0=C2=A0 respect to blocking or filtering of queries that lead to clie=
nts<br>=C2=A0=C2=A0 receiving inconsistent answers</font></div><div><font f=
ace=3D"monospace"></font><br></div></div></div></div></div></div></div></di=
v></div></blockquote><div><br></div><div>If you put resolvers with differen=
t policies into the trusted set, that can happen.=C2=A0 If the resolvers ar=
e transparent about their policies, this seems less likely to happen, becau=
se you will put resolvers into the set only when you are both confident of =
their privacy-preserving behavior and that their policies match your desire=
s.<br></div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"mar=
gin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1=
ex"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><di=
v dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div></div=
><div>If I compare the above to the set of perspectives outlined in ICANN S=
AC109, my expectation is that the resulting net change in the ability to me=
et their needs is as follows:</div><div><br></div><div>4.1 (Parents):=C2=A0=
 Negative</div><div>4.2 (Enterprise Network Managers):=C2=A0 Negative</div>=
<div>4.3 (Dissidents, Protesters and Others):=C2=A0 Positive</div><div>4.4 =
(Internet Service Providers):=C2=A0 Negative</div><div><br></div><div>Would=
 you agree with this assessment? Or have I missed something crucial?</div><=
div><br></div></div></div></div></div></div></div></div></div></blockquote>=
<div><br></div><div>I&#39;m not familiar enough with SAC 109 to comment, so=
 I&#39;ll leave that to others.=C2=A0 My personal belief is that the abilit=
y to choose what resolvers belong in the set is important enough that it sh=
ould map to the client&#39;s controller (which might be an individual, the =
parent of child, the enterprise owner of an employee device).=C2=A0 <br></d=
iv><div><br></div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"l=
tr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><di=
v></div><div>I&#39;m normally optimistic so let&#39;s assume there is a way=
 to mitigate the negatives. Let=E2=80=99s now focus on whether the impact t=
o privacy is always positive. I think there is a case where it may be weake=
r than the status quo.</div><div><br></div><div>Imagine a normal residentia=
l home. This one has five different wifi clients, with a single recursive r=
esolver (A) outside the home, on the internet. This is shown below (apologi=
es to anyone reading the plain text version).</div><div><br></div><div><div=
><img alt=3D"Normal.png" src=3D"cid:ii_k80hvuj50" width=3D"554" height=3D"4=
57"><br></div>Resolver A sees the merged traffic of all 5 clients, coming f=
rom a single IP address.</div><div><br></div><div>With the client-based sel=
ection mode (section 4.1), and two resolvers chosen (A and B), those resolv=
ers can learn more data about the specific clients:<br></div><div><div><img=
 alt=3D"With two resolvers.png" src=3D"cid:ii_k80i10ac1" width=3D"554" heig=
ht=3D"493"><br></div><b></b><i></i><u></u><sub></sub><sup></sup><strike></s=
trike>Of course A can individually separate clients 1, 3 and 5, because eve=
n though they share an IP address, they&#39;ve all set up separate TLS sess=
ions.</div><div><br></div></div></div></div></div></div></div></div></div><=
/blockquote><div><br></div><div>I find your graphic a bit confusing, becaus=
e you are not treating the stub resolver in the home router as if it were a=
 part of the calculus here.=C2=A0 If I understand things correctly, if thos=
e clients were actively choosing to use a resolver here (rather than taking=
 one by association), they would be choosing the home router, rather than A=
 (let&#39;s call the home router resolver H).=C2=A0 They presumably believe=
 H has policies that match the ones they prefer; A is opaque to them.=C2=A0=
 But H sees the traffic of all five clients; that&#39;s the common trade-of=
f there.<br></div><div><br></div><div>=C2=A0</div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"=
><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div d=
ir=3D"ltr"><div></div><div>Is this is a legitimate privacy issue?</div><div=
><br></div></div></div></div></div></div></div></div></div></blockquote><di=
v><br></div><div>As I said, there are trade-offs here.=C2=A0 In any case wh=
ere your query traffic goes to a recursive resolver, the number of clients =
sharing that resolver increases the anonymity set for traffic analyzed upst=
ream of that resolver.=C2=A0 In your first example, because your A is upstr=
eam of H, H&#39;s clients get an anonymity set size of 5 with respect to A.=
=C2=A0 In your example two, for traffic analyzed upstream of A or B, the an=
onymity set size is likely to be much higher, but the tradeoff is that that=
 A (or B) has a more direct view of a larger number of clients.<br></div><d=
iv>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr=
"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div></div><div>I woul=
d be grateful for your thoughts, either on the list or during the presentat=
ion on Tuesday. And if anyone on the list has a view, particularly if there=
 is a way to modify the text such that negative impacts can be reduced, tha=
t would be most valuable.</div><div><br></div></div></div></div></div></div=
></div></div></div></blockquote><div><br></div><div>thanks again for the re=
view,</div><div><br></div><div>Ted<br></div><div><br></div><div>=C2=A0</div=
><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border=
-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"lt=
r"><div dir=3D"ltr"><div dir=3D"ltr"><div></div><div>Thanks,</div><div>Chri=
s</div><div><br></div><div><br></div><div>

</div></div></div></div></div></div></div></div><br><div class=3D"gmail_quo=
te"><div class=3D"gmail_attr" dir=3D"ltr">On Tue, 25 Feb 2020 at 18:01, Ted=
 Hardie &lt;<a href=3D"mailto:ted.ietf@gmail.com" target=3D"_blank">ted.iet=
f@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left:1px solid rgb(204=
,204,204)"><div dir=3D"ltr"><div>Howdy,</div><div><br></div><div>Jari, Mart=
in, and I put together <a href=3D"https://datatracker.ietf.org/doc/draft-ar=
kko-abcd-distributed-resolver-selection/?include_text=3D1" target=3D"_blank=
">draft-arkko-abcd-distributed-resolver-selection</a> <font size=3D"2"><spa=
n style=3D"font-family:arial,sans-serif"><span style=3D"font-weight:normal"=
>to start a discussion on whether DNS clients can improve their privacy thr=
ough the use of a set of multiple recursive resolver services.=C2=A0 We thi=
nk it might be in scope for ADD, since the charter says the group &quot;wil=
l focus on discovery and selection of DNS resolvers&quot; and this discusse=
s the impact of selecting more than one.=C2=A0 <br></span></span></font></d=
iv><div><font size=3D"2"><span style=3D"font-family:arial,sans-serif"><span=
 style=3D"font-weight:normal"><br></span></span></font></div><div><font siz=
e=3D"2"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-we=
ight:normal">Do the chairs and the working group agree?=C2=A0 If so, can we=
 ask for agenda time at IETF 107 to present?=C2=A0 <br></span></span></font=
></div><div><font size=3D"2"><span style=3D"font-family:arial,sans-serif"><=
span style=3D"font-weight:normal"><br></span></span></font></div><div><font=
 size=3D"2"><span style=3D"font-family:arial,sans-serif"><span style=3D"fon=
t-weight:normal">thanks,</span></span></font></div><div><font size=3D"2"><s=
pan style=3D"font-family:arial,sans-serif"><span style=3D"font-weight:norma=
l"><br></span></span></font></div><div><font size=3D"2"><span style=3D"font=
-family:arial,sans-serif"><span style=3D"font-weight:normal">Ted<br></span>=
</span></font></div></div>
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</blockquote></div></div>
</blockquote></div></div>

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From: Rob Sayre <sayrer@gmail.com>
Date: Fri, 20 Mar 2020 20:11:40 -0700
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To: "Chris Box (BT)" <chris.box.ietf@gmail.com>
Cc: Ted Hardie <ted.ietf@gmail.com>, ADD Mailing list <add@ietf.org>, Jari Arkko <jari.arkko@piuha.net>, Martin Thomson <mt@lowentropy.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/add/j_j0kYArR5af4oYKi4_tk_ni1Yk>
Subject: Re: [Add] draft-arkko-abcd-distributed-resolver-selection
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On Fri, Mar 20, 2020 at 11:23 AM Chris Box (BT) <chris.box.ietf@gmail.com>
wrote:

>
> Of course A can individually separate clients 1, 3 and 5, because even
> though they share an IP address, they've all set up separate TLS sessions.
>

Is this detailed enough? I'm not sure what you mean by "client", since each
client could be one computer with multiple resolvers. For example, Firefox
could be pointed at Cloudflare, while the system uses whatever DHCP says.
That is certainly what my MacBook does.

More subtly, the second diagram avoids all sorts of security problems along
the path to the resolvers. A very common one is compromised home routers.

thanks,
Rob

--000000000000840b3805a154c3e6
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<div dir=3D"ltr"><div dir=3D"ltr">On Fri, Mar 20, 2020 at 11:23 AM Chris Bo=
x (BT) &lt;<a href=3D"mailto:chris.box.ietf@gmail.com">chris.box.ietf@gmail=
.com</a>&gt; wrote:<br></div><div class=3D"gmail_quote"><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=
=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr=
"><div dir=3D"ltr"><div><div><br></div><b></b><i></i><u></u><sub></sub><sup=
></sup><strike></strike>Of course A can individually separate clients 1, 3 =
and 5, because even though they share an IP address, they&#39;ve all set up=
 separate TLS sessions.</div></div></div></div></div></div></div></div></di=
v></blockquote><div><br></div><div>Is this detailed enough? I&#39;m not sur=
e what you mean by &quot;client&quot;, since each client could be one compu=
ter with multiple resolvers. For example, Firefox could be pointed at Cloud=
flare, while the system uses whatever DHCP says. That is certainly what my =
MacBook does.</div><div><br></div><div>More subtly, the second diagram avoi=
ds all sorts of security problems along the path to the resolvers. A very c=
ommon one is compromised home routers.</div><div><br></div><div>thanks,</di=
v><div>Rob</div><div><br></div><div><br></div></div></div>

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From: "Chris Box (BT)" <chris.box.ietf@gmail.com>
Date: Sat, 21 Mar 2020 16:31:55 +0000
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To: Ted Hardie <ted.ietf@gmail.com>
Cc: ADD Mailing list <add@ietf.org>, Jari Arkko <jari.arkko@piuha.net>,  Martin Thomson <mt@lowentropy.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/add/SxQIt0IWQUo8Pbei01jF8qi9zds>
Subject: Re: [Add] draft-arkko-abcd-distributed-resolver-selection
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Hi Ted,

Thanks for responding. Let's take a look:

On Fri, 20 Mar 2020 at 21:24, Ted Hardie <ted.ietf@gmail.com> wrote:

>
> If you look at section 4.1, you'll see that one of the strategies is "to
> distribute each different client to a different resolver."  If the client=
's
> trusted set includes the local network resolver, it might well be
> associated with that network.    Because this strategy is focused on the
> aggregate distribution of DNS queries, there are a lot of cases where the
> local network being trusted means the current association methods don't
> actually change for some clients.
>

To clarify, we're talking here about the case where the client's trusted
set consists of these two:
* The local resolver
* A more distant resolver

These two are operated by different parties. I agree that in strategy 4.1,
sometimes it will exclusively use the local resolver, and this means no
change in behaviour. Other times it will not.  In the general case, clients
use a mixture of the two.

If you put resolvers with different policies into the trusted set, that can
> happen.  If the resolvers are transparent about their policies, this seem=
s
> less likely to happen, because you will put resolvers into the set only
> when you are both confident of their privacy-preserving behavior and that
> their policies match your desires.
>

Given that the resolvers within the set are operated by different parties,
I would say it's extremely likely that their privacy policies will have
non-identical wording, and consequently different semantics. As a user it's
already hard enough to read one privacy policy and satisfy yourself it's
ok. To have to do this more than once is quite a (human) challenge.

>

> I'm not familiar enough with SAC 109 to comment, so I'll leave that to
> others.  My personal belief is that the ability to choose what resolvers
> belong in the set is important enough that it should map to the client's
> controller (which might be an individual, the parent of child, the
> enterprise owner of an employee device).
>

I will suggest it=E2=80=99s worth a read, as the issues are complex enough =
that
they can=E2=80=99t be solved by requiring administrative control of the cli=
ent.

>
I find your graphic a bit confusing, because you are not treating the stub
> resolver in the home router as if it were a part of the calculus here.  I=
f
> I understand things correctly, if those clients were actively choosing to
> use a resolver here (rather than taking one by association), they would b=
e
> choosing the home router, rather than A (let's call the home router
> resolver H).  They presumably believe H has policies that match the ones
> they prefer; A is opaque to them.  But H sees the traffic of all five
> clients; that's the common trade-off there.
>

Yes H could be part of the set, but since this draft is about using
multiple resolvers it would not be the only one. There must be at least one
remote resolver.

I had drawn it using two remotes (A & B), but if instead it was one remote
(H & A), the same issue applies. Resolver A can individually discriminate
between all the clients who are contacting it. Compare this with the status
quo, where H is the sole intermediary, and remote recursive resolvers do
not obtain that fine-grained client identification.


> As I said, there are trade-offs here.  In any case where your query
> traffic goes to a recursive resolver, the number of clients sharing that
> resolver increases the anonymity set for traffic analyzed upstream of tha=
t
> resolver.  In your first example, because your A is upstream of H, H's
> clients get an anonymity set size of 5 with respect to A.  In your exampl=
e
> two, for traffic analyzed upstream of A or B, the anonymity set size is
> likely to be much higher, but the tradeoff is that that A (or B) has a mo=
re
> direct view of a larger number of clients.
>

Yes, we agree with the more direct view of the clients. I wasn't really
thinking about upstream of the recursives, but yes on that side, the larger
the number of clients using A, the more anonymity. For a large ISP, this
can be well into the millions.

Thanks,
Chris

--00000000000060752f05a15ff12a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div dir=3D"ltr"><div>Hi Ted,</div><div><br></div><di=
v>Thanks for responding. Let&#39;s take a look:<br></div><br><div class=3D"=
gmail_quote"></div></div></div><div><div dir=3D"ltr" class=3D"gmail_attr">O=
n Fri, 20 Mar 2020 at 21:24, Ted Hardie &lt;<a href=3D"mailto:ted.ietf@gmai=
l.com" target=3D"_blank">ted.ietf@gmail.com</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div class=3D"g=
mail_quote"><br><div><div>If you look at section 4.1, you&#39;ll see that o=
ne of the strategies is &quot;to distribute each different client to a diff=
erent resolver.&quot;=C2=A0 If the client&#39;s trusted set includes the lo=
cal network resolver, it might well be associated with that network.=C2=A0=
=C2=A0=C2=A0 Because this strategy is focused on the aggregate distribution=
 of DNS queries, there are a lot of cases where the local network being tru=
sted means the current association methods don&#39;t actually change for so=
me clients.<br></div></div></div></div></blockquote><div><br></div></div><d=
iv><div>To clarify, we&#39;re talking here about the case where the client&=
#39;s trusted set consists of these two:<br></div><div style=3D"margin-left=
:40px">* The local resolver</div><div style=3D"margin-left:40px">* A more d=
istant resolver</div><div><br></div><div>These two are operated by differen=
t parties. I agree that in strategy 4.1, sometimes it will exclusively use =
the local resolver, and this means no change in behaviour. Other times it w=
ill not.=C2=A0 In the general case, clients use a mixture of the two.</div>=
</div><div><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin=
:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"=
><div dir=3D"ltr"><div class=3D"gmail_quote"><div><div></div></div><div>If =
you put resolvers with different policies into the trusted set, that can ha=
ppen.=C2=A0 If the resolvers are transparent about their policies, this see=
ms less likely to happen, because you will put resolvers into the set only =
when you are both confident of their privacy-preserving behavior and that t=
heir policies match your desires.<br></div></div></div></blockquote><div><b=
r></div></div><div><div>Given that the resolvers within the set are operate=
d by different parties, I would say it&#39;s extremely likely that their pr=
ivacy policies will have non-identical wording, and consequently different =
semantics. As a user it&#39;s already hard enough to read one privacy polic=
y and satisfy yourself it&#39;s ok. To have to do this more than once is qu=
ite a (human) challenge.<br></div></div><div><div dir=3D"ltr"><div class=3D=
"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D=
"ltr"><div class=3D"gmail_quote"><div></div></div></div></blockquote><div d=
ir=3D"auto"><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px=
 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><di=
v dir=3D"ltr"><div class=3D"gmail_quote"><div><br></div><div>I&#39;m not fa=
miliar enough with SAC 109 to comment, so I&#39;ll leave that to others.=C2=
=A0 My personal belief is that the ability to choose what resolvers belong =
in the set is important enough that it should map to the client&#39;s contr=
oller (which might be an individual, the parent of child, the enterprise ow=
ner of an employee device).=C2=A0 </div></div></div></blockquote><div dir=
=3D"auto"><br></div><div dir=3D"auto">I will suggest it=E2=80=99s worth a r=
ead, as the issues are complex enough that they can=E2=80=99t be solved by =
requiring administrative control of the client.=C2=A0</div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_quot=
e"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div =
dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"=
ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div></div></div></div></div></div><=
/div></div></div></div></blockquote></div></div></blockquote><div dir=3D"au=
to"><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D=
"ltr"><div class=3D"gmail_quote"><div>I find your graphic a bit confusing, =
because you are not treating the stub resolver in the home router as if it =
were a part of the calculus here.=C2=A0 If I understand things correctly, i=
f those clients were actively choosing to use a resolver here (rather than =
taking one by association), they would be choosing the home router, rather =
than A (let&#39;s call the home router resolver H).=C2=A0 They presumably b=
elieve H has policies that match the ones they prefer; A is opaque to them.=
=C2=A0 But H sees the traffic of all five clients; that&#39;s the common tr=
ade-off there.</div></div></div></blockquote><div dir=3D"auto"><br></div><d=
iv dir=3D"auto">Yes H could be part of the set, but since this draft is abo=
ut using multiple resolvers it would not be the only one. There must be at =
least one remote resolver.</div><div dir=3D"auto"><br></div><div dir=3D"aut=
o">I had drawn it using two remotes (A &amp; B), but if instead it was one =
remote (H &amp; A), the same issue applies. Resolver A can individually dis=
criminate between all the clients who are contacting it. Compare this with =
the status quo, where H is the sole intermediary, and remote recursive reso=
lvers do not obtain that fine-grained client identification.=C2=A0</div><di=
v dir=3D"auto"><br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=
<div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"auto"></div><div di=
r=3D"auto">=C2=A0</div><div dir=3D"auto">As I said, there are trade-offs he=
re.=C2=A0 In any case where your query traffic goes to a recursive resolver=
, the number of clients sharing that resolver increases the anonymity set f=
or traffic analyzed upstream of that resolver.=C2=A0 In your first example,=
 because your A is upstream of H, H&#39;s clients get an anonymity set size=
 of 5 with respect to A.=C2=A0 In your example two, for traffic analyzed up=
stream of A or B, the anonymity set size is likely to be much higher, but t=
he tradeoff is that that A (or B) has a more direct view of a larger number=
 of clients.<br></div></div></div></blockquote><div><br></div><div>Yes, we =
agree with the more direct view of the clients. I wasn&#39;t really thinkin=
g about upstream of the recursives, but yes on that side, the larger the nu=
mber of clients using A, the more anonymity. For a large ISP, this can be w=
ell into the millions.</div><div><br></div><div>Thanks,</div><div>Chris</di=
v></div></div>
</div>
</div>

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From: Rob Sayre <sayrer@gmail.com>
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Subject: Re: [Add] draft-arkko-abcd-distributed-resolver-selection
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--000000000000f2283905a16a8ff3
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On Fri, Mar 20, 2020 at 11:23 AM Chris Box (BT) <chris.box.ietf@gmail.com>
wrote:

>
> If I compare the above to the set of perspectives outlined in ICANN
> SAC109, my expectation is that the resulting net change in the ability to
> meet their needs is as follows:
>
> 4.1 (Parents):  Negative
> 4.2 (Enterprise Network Managers):  Negative
>

Items 4.1 and 4.2 are pretend security.  Just take a Google Pixel phone and
turn on the built-in VPN.

I know some people will jump in and say "but the regulators!". That is both
off-topic for this list, and ultimately contemptuous of whomever they think
will buy that line.


> 4.3 (Dissidents, Protesters and Others):  Positive
>

I would say neutral, since they probably don't rely on clear text DNS.


> 4.4 (Internet Service Providers):  Negative
>

Why would that be?

thanks,
Rob

--000000000000f2283905a16a8ff3
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<div dir=3D"ltr"><div dir=3D"ltr">On Fri, Mar 20, 2020 at 11:23 AM Chris Bo=
x (BT) &lt;<a href=3D"mailto:chris.box.ietf@gmail.com">chris.box.ietf@gmail=
.com</a>&gt; wrote:<br></div><div class=3D"gmail_quote"><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=
=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr=
"><div dir=3D"ltr"><div><font face=3D"monospace"></font><br></div><div>If I=
 compare the above to the set of perspectives outlined in ICANN SAC109, my =
expectation is that the resulting net change in the ability to meet their n=
eeds is as follows:</div><div><br></div><div>4.1 (Parents):=C2=A0 Negative<=
/div><div>4.2 (Enterprise Network Managers):=C2=A0 Negative</div></div></di=
v></div></div></div></div></div></div></blockquote><div><br></div><div>Item=
s 4.1 and 4.2 are pretend security.=C2=A0 Just take a Google Pixel phone an=
d turn on the built-in VPN.</div><div><br></div><div>I know some people wil=
l jump in and say &quot;but the regulators!&quot;. That is both off-topic f=
or this list, and ultimately contemptuous of whomever they think will buy t=
hat line.</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr">=
<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>4.=
3 (Dissidents, Protesters and Others):=C2=A0 Positive</div></div></div></di=
v></div></div></div></div></div></blockquote><div><br></div><div>I would sa=
y neutral, since they probably don&#39;t rely on clear text DNS.</div><div>=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"l=
tr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><di=
v dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>4.4 (Internet Service =
Providers):=C2=A0 Negative</div></div></div></div></div></div></div></div><=
/div></blockquote><div><br></div><div>Why would that be?</div><div><br></di=
v><div>thanks,</div><div>Rob</div><div><br></div></div></div>

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Subject: Re: [Add] draft-arkko-abcd-distributed-resolver-selection
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>     Il 20/03/2020 22:23 Ted Hardie <ted.ietf@gmail.com> ha scritto:
> 
> 
>         > > 
> >         We then get onto the problem briefly mentioned in section 6.2, namely
> >            different resolvers might have different policies with
> >            respect to blocking or filtering of queries that lead to clients
> >            receiving inconsistent answers
> > 
> > 
> >     > 
>     If you put resolvers with different policies into the trusted set, that can happen.  If the resolvers are transparent about their policies, this seems less likely to happen, because you will put resolvers into the set only when you are both confident of their privacy-preserving behavior and that their policies match your desires.
> 
Assuming that "you" in your sentence is the end-user and not the client, it is hard to think that this approach can work in practice for the ordinary user; as a minimum, as suggested by other drafts, there should be an automated, standardized way for resolvers to describe their policies and for clients to retrieve them and match them against the user's preferences, without requiring the user to go through legalese terms & conditions every time they want to add/accept a new resolver into the set (though there might be a legal requirement that they do anyway).

In the absence of that, it would be likely that the user only went through the hassle of vetting and adding a new resolver for two or three times, which could easily frustrate the privacy properties of the concept and in fact bring forth more centralization and more opportunities for user tracking.

(By the way, the draft seems to lack a proper "Privacy Considerations" section, is it still in the making? That could be a place to record this discussion.)

In addition, the above approach does not work for adversarial filtering, i.e. the one done according to legal/policy requirements without the consent of the user, or that the user would even actively try to circumvent. Of course there are radically different views on whether that practice is good or bad and we should not reopen that discussion, but "inconsistent answers" is a side effect, not the key issue that would derive from a widespread adoption of the model discussed in the draft; so the draft should mention those issues too. The assessment in section 6 should be expanded to make it clear what the effects of the proposed model would be on currently common use cases for the DNS, like legally mandated filtering or security filtering by ISP/corporate networks.

--

Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
vittorio.bertola@open-xchange.com mailto:vittorio.bertola@open-xchange.com 
Office @ Via Treviso 12, 10144 Torino, Italy

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    Il 20/03/2020 22:23 Ted Hardie &lt;ted.ietf@gmail.com&gt; ha scritto:
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               We then get onto the problem briefly mentioned in section 6.2, namely 
               <br>
               <span style="font-family: monospace;">&nbsp;&nbsp; different resolvers might have different policies with<br>&nbsp;&nbsp; respect to blocking or filtering of queries that lead to clients<br>&nbsp;&nbsp; receiving inconsistent answers</span>
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      If you put resolvers with different policies into the trusted set, that can happen.&nbsp; If the resolvers are transparent about their policies, this seems less likely to happen, because you will put resolvers into the set only when you are both confident of their privacy-preserving behavior and that their policies match your desires.
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   Assuming that "you" in your sentence is the end-user and not the client, it is hard to think that this approach can work in practice for the ordinary user; as a minimum, as suggested by other drafts, there should be an automated, standardized way for resolvers to describe their policies and for clients to retrieve them and match them against the user's preferences, without requiring the user to go through legalese terms &amp; conditions every time they want to add/accept a new resolver into the set (though there might be a legal requirement that they do anyway).
   <br>
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   <br>
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   In the absence of that, it would be likely that the user only went through the hassle of vetting and adding a new resolver for two or three times, which could easily frustrate the privacy properties of the concept and in fact bring forth more centralization and more opportunities for user tracking.
   <br>
  </div>
  <div>
   <br>
  </div>
  <div>
   (By the way, the draft seems to lack a proper "Privacy Considerations" section, is it still in the making? That could be a place to record this discussion.)
   <br>
  </div>
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   <br>
  </div>
  <div>
   In addition, the above approach does not work for adversarial filtering, i.e. the one done according to legal/policy requirements without the consent of the user, or that the user would even actively try to circumvent. Of course there are radically different views on whether that practice is good or bad and we should not reopen that discussion, but "inconsistent answers" is a side effect, not the key issue that would derive from a widespread adoption of the model discussed in the draft; so the draft should mention those issues too. The assessment in section 6 should be expanded to make it clear what the effects of the proposed model would be on currently common use cases for the DNS, like legally mandated filtering or security filtering by ISP/corporate networks.
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   <p>-- <br class=""></p>
   <pre class="">Vittorio Bertola | Head of Policy &amp; Innovation, Open-Xchange<br><a href="mailto:vittorio.bertola@open-xchange.com">vittorio.bertola@open-xchange.com</a> <br>Office @ Via Treviso 12, 10144 Torino, Italy</pre>
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From: Rob Sayre <sayrer@gmail.com>
Date: Mon, 23 Mar 2020 14:19:40 -0700
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To: Andrew Campling <andrew.campling@419.consulting>
Cc: "Chris Box (BT)" <chris.box.ietf@gmail.com>, Ted Hardie <ted.ietf@gmail.com>,  ADD Mailing list <add@ietf.org>, Jari Arkko <jari.arkko@piuha.net>, Martin Thomson <mt@lowentropy.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/add/RoNsH8c6C3PW1DCKewk-ax71ORg>
Subject: Re: [Add] draft-arkko-abcd-distributed-resolver-selection
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On Mon, Mar 23, 2020 at 2:09 PM Andrew Campling
<andrew.campling@419.consulting> wrote:

> On Fri, Sun 22, 2020 at 05:12 Rob Sayre <sayrer@gmail.com> wrote:
>
>
>
> > Items 4.1 and 4.2 are pretend security.  Just take a Google Pixel phone
> and turn on the built-in VPN.
>
>
>
> I=E2=80=99m curious why you believe parents and enterprise network manage=
rs are
> =E2=80=9Cpretend security=E2=80=9D?  Are you, for example, suggesting tha=
t there is
> currently no security on home or enterprise networks, or did you mean
> something else?
>

They aren't, but DNS-based measures (without installed Parental Control
Software or Enterprise Admin access) are. Chris Box wrote:

"the issues are complex enough that they can=E2=80=99t be solved by requiri=
ng
administrative control of the client."

But I think that solutions that don't require administrative control are
ineffective. My example was a Google Pixel phone: mine ships with a VPN
on-by-default for open WiFi, and the option to turn it on for all
connections.

thanks,
Rob

--0000000000001a451605a18c32a1
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<div dir=3D"ltr"><div dir=3D"ltr">On Mon, Mar 23, 2020 at 2:09 PM Andrew Ca=
mpling &lt;andrew.campling@419.consulting&gt; wrote:<br></div><div class=3D=
"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-GB">
<div class=3D"gmail-m_7959643033568282845WordSection1">
<p class=3D"MsoNormal">On Fri, Sun 22, 2020 at 05:12 <span lang=3D"EN-US">R=
ob Sayre &lt;<a href=3D"mailto:sayrer@gmail.com" target=3D"_blank">sayrer@g=
mail.com</a>&gt;
</span>wrote:<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt"><u></u>=C2=A0<u></u><=
/span></p>
<div>
<div>
<div>
<p class=3D"MsoNormal">&gt; Items 4.1 and 4.2 are pretend security.=C2=A0 J=
ust take a Google Pixel phone and turn on the built-in VPN.<u></u><u></u></=
p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I=E2=80=99m curious why you believe parents and ente=
rprise network managers are =E2=80=9Cpretend security=E2=80=9D?=C2=A0 Are y=
ou, for example, suggesting that there is currently no security on home or =
enterprise networks, or did you mean something else?=C2=A0 =C2=A0</p></div>=
</div></div></div></div></blockquote><div><br></div><div>They aren&#39;t, b=
ut DNS-based measures (without installed Parental Control Software or Enter=
prise Admin access) are. Chris Box wrote:</div><div><br></div><div>&quot;th=
e issues are complex enough that they can=E2=80=99t be solved by requiring =
administrative control of the client.&quot;</div><div><br></div><div>But I =
think that solutions that don&#39;t require administrative control are inef=
fective. My example was a Google Pixel phone: mine ships with a VPN on-by-d=
efault for open WiFi, and the option to turn it on for all connections.</di=
v><div><br></div><div>thanks,</div><div>Rob</div><div><br></div></div></div=
>

--0000000000001a451605a18c32a1--


From nobody Mon Mar 23 14:56:24 2020
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To: Ted Hardie <ted.ietf@gmail.com>, "Chris Box (BT)" <chris.box.ietf@gmail.com>
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Subject: Re: [Add] draft-arkko-abcd-distributed-resolver-selection
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Ted, Chris,

> If I compare the above to the set of perspectives outlined in ICANN =
SAC109, my expectation is that the resulting net change in the ability =
to meet their needs is as follows:
>=20
> 4.1 (Parents):  Negative
> 4.2 (Enterprise Network Managers):  Negative
> 4.3 (Dissidents, Protesters and Others):  Positive
> 4.4 (Internet Service Providers):  Negative
>=20
> Would you agree with this assessment? Or have I missed something =
crucial?
>=20
>=20
> I'm not familiar enough with SAC 109 to comment, so I'll leave that to =
others.  My personal belief is that the ability to choose what resolvers =
belong in the set is important enough that it should map to the client's =
controller (which might be an individual, the parent of child, the =
enterprise owner of an employee device). =20

I agree with Ted of course. I=E2=80=99d actually suggest also that there =
are different perspectives on what one considers trustworthy*. We did =
not want to discuss that under this draft. Rather, our goal was to =
discuss whether using multiple resolvers would provide a privacy =
benefit, not whether you trust a particular entity or a particular type =
of an entity. Why we mentioned something about different policies in =
Section 6.2 was not because we wanted to take a position, but rather the =
fact *if* you use multiple servers, then *if* their policies are very =
different this may result in unexpected results.

Jari

*) Including whether one is concerned about accuracy vs. privacy and =
whose control you are worried about.


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div>Ted, Chris,</div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D"gmail_quote"><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr" class=3D""><div =
dir=3D"ltr" class=3D""><div dir=3D"ltr" class=3D""><div dir=3D"ltr" =
class=3D""><div dir=3D"ltr" class=3D""><div dir=3D"ltr" class=3D""><div =
dir=3D"ltr" class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D""></div><div class=3D"">If I compare the above to the set of =
perspectives outlined in ICANN SAC109, my expectation is that the =
resulting net change in the ability to meet their needs is as =
follows:</div><div class=3D""><br class=3D""></div><div class=3D"">4.1 =
(Parents):&nbsp; Negative</div><div class=3D"">4.2 (Enterprise Network =
Managers):&nbsp; Negative</div><div class=3D"">4.3 (Dissidents, =
Protesters and Others):&nbsp; Positive</div><div class=3D"">4.4 =
(Internet Service Providers):&nbsp; Negative</div><div class=3D""><br =
class=3D""></div><div class=3D"">Would you agree with this assessment? =
Or have I missed something crucial?</div><div class=3D""><br =
class=3D""></div></div></div></div></div></div></div></div></div></blockqu=
ote><div class=3D""><br class=3D""></div><div class=3D"">I'm not =
familiar enough with SAC 109 to comment, so I'll leave that to =
others.&nbsp; My personal belief is that the ability to choose what =
resolvers belong in the set is important enough that it should map to =
the client's controller (which might be an individual, the parent of =
child, the enterprise owner of an employee device).&nbsp; <br =
class=3D""></div></div></div></blockquote><br class=3D""></div><div>I =
agree with Ted of course. I=E2=80=99d actually suggest also that there =
are different perspectives on what one considers trustworthy*. We did =
not want to discuss that under this draft. Rather, our goal was to =
discuss whether using multiple resolvers would provide a privacy =
benefit, not whether you trust a particular entity or a particular type =
of an entity. Why we mentioned something about different policies in =
Section 6.2 was not because we wanted to take a position, but rather the =
fact *if* you use multiple servers, then *if* their policies are very =
different this may result in unexpected results.</div><div><br =
class=3D""></div><div>Jari</div><div><br class=3D""></div><div>*) =
Including whether one is concerned about accuracy vs. privacy and whose =
control you are worried about.</div><div><br =
class=3D""></div></body></html>=

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From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Subject: [Add] antitrust implications of IETF resolver discovery protocol work
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Has anyone done an analysis of the antitrust implications of this work 
under an IETF aegis?  Has the IETF Trust bought off on this?

The work here is similar that undertaken for The Handle System, and the 
CNRI work in ITU to develop X.1255 and related treaty instrument 
resolutions.

--tony


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From: Paul Hoffman <paul.hoffman@icann.org>
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On Mar 23, 2020, at 5:17 PM, Tony Rutkowski <rutkowski.tony@gmail.com> =
wrote:
>=20
> Has anyone done an analysis of the antitrust implications of this work =
under an IETF aegis?  Has the IETF Trust bought off on this?

Not that has reported to this group.

> The work here is similar that undertaken for The Handle System, and =
the CNRI work in ITU to develop X.1255 and related treaty instrument =
resolutions.

In what way is it "similar"? Various ways of doing discovery have been =
done for over 30 years.

--Paul Hoffman=

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To: Add@ietf.org
From: Tony Rutkowski <rutkowski.tony@gmail.com>
Cc: Robert Kahn <rkahn@cnri.reston.va.us>, Paul Hoffman <paul.hoffman@icann.org>
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Subject: Re: [Add] [Ext] antitrust implications of IETF resolver discovery protocol work
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Hi Paul,

Indeed they have.  That's the point, they are similar.  Bob can speak as 
to the similarities and why The Handle System might be better here, or a 
competitive alternative.

This kind of work in the past has usually had some kind of 
governmental/intergovernmental aegis for antitrust protection. Here, it 
appears there is arguably significant potential exposure.  Just 
suggesting an antitrust analysis is appropriate, as well as some care as 
to the anti competitive effects.

--tony

>
>       Re: [Add] [Ext] antitrust implications of IETF resolver
>       discovery protocol work
>
> Paul Hoffman <paul.hoffman@icann.org>Tue, 24 March 2020 00:22 UTCShow 
> header <https://mailarchive.ietf.org/arch/browse/add/?#>
>
> On Mar 23, 2020, at 5:17 PM, Tony Rutkowski<rutkowski.tony@gmail.com>  <mailto:&lt;rutkowski.tony@gmail.com&gt;>  wrote:
> > 
> > Has anyone done an analysis of the antitrust implications of this work under an IETF aegis?  Has the IETF Trust bought off on this?
>
> Not that has reported to this group.
>
> > The work here is similar that undertaken for The Handle System, and the CNRI work in ITU to develop X.1255 and related treaty instrument resolutions.
>
> In what way is it "similar"? Various ways of doing discovery have been done for over 30 years.
>
> --Paul Hoffman


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    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
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  <body>
    <p>Hi Paul,</p>
    <p>Indeed they have.  That's the point, they are similar.  Bob can
      speak as to the similarities and why The Handle System might be
      better here, or a competitive alternative.<br>
    </p>
    <p>This kind of work in the past has usually had some kind of
      governmental/intergovernmental aegis for antitrust protection. 
      Here, it appears there is arguably significant potential
      exposure.  Just suggesting an antitrust analysis is appropriate,
      as well as some care as to the anti competitive effects.<br>
    </p>
    <p>--tony<br>
    </p>
    <p>
      <blockquote type="cite">
        <h3 style="box-sizing: border-box; margin: 2px 0px; font-weight:
          normal; line-height: 1.2; font-size: 18px; color: rgb(33, 37,
          41); font-family: -apple-system, BlinkMacSystemFont,
          &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;,
          Arial, &quot;Noto Sans&quot;, sans-serif, &quot;Apple Color
          Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI
          Symbol&quot;, &quot;Noto Color Emoji&quot;; font-style:
          normal; font-variant-ligatures: normal; font-variant-caps:
          normal; letter-spacing: normal; orphans: 2; text-align: left;
          text-indent: 0px; text-transform: none; white-space: normal;
          widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;
          background-color: rgb(255, 255, 255); text-decoration-style:
          initial; text-decoration-color: initial;">Re: [Add] [Ext]
          antitrust implications of IETF resolver discovery protocol
          work</h3>
        <p id="msg-info" class="msg-header" style="box-sizing:
          border-box; margin: 0px 0px 20px; color: rgb(128, 128, 128);
          font-family: -apple-system, BlinkMacSystemFont, &quot;Segoe
          UI&quot;, Roboto, &quot;Helvetica Neue&quot;, Arial,
          &quot;Noto Sans&quot;, sans-serif, &quot;Apple Color
          Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI
          Symbol&quot;, &quot;Noto Color Emoji&quot;; font-size: 14px;
          font-style: normal; font-variant-ligatures: normal;
          font-variant-caps: normal; font-weight: 400; letter-spacing:
          normal; orphans: 2; text-align: left; text-indent: 0px;
          text-transform: none; white-space: normal; widows: 2;
          word-spacing: 0px; -webkit-text-stroke-width: 0px;
          background-color: rgb(255, 255, 255); text-decoration-style:
          initial; text-decoration-color: initial;"><span id="msg-from"
            class="pipe" style="box-sizing: border-box;">Paul Hoffman
            <a class="moz-txt-link-rfc2396E" href="mailto:paul.hoffman@icann.org">&lt;paul.hoffman@icann.org&gt;</a></span><span> </span><span
            id="msg-date" class="pipe" style="box-sizing: border-box;">Tue,
            24 March 2020 00:22 UTC</span><a id="toggle-msg-header"
            class="toggle"
            href="https://mailarchive.ietf.org/arch/browse/add/?#"
            style="box-sizing: border-box; color: rgb(51, 122, 183);
            text-decoration: none; background-color: transparent;">Show
            header</a></p>
        <div class="msg-payload" style="box-sizing: border-box; color:
          rgb(33, 37, 41); font-family: -apple-system,
          BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto,
          &quot;Helvetica Neue&quot;, Arial, &quot;Noto Sans&quot;,
          sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI
          Emoji&quot;, &quot;Segoe UI Symbol&quot;, &quot;Noto Color
          Emoji&quot;; font-size: 14px; font-style: normal;
          font-variant-ligatures: normal; font-variant-caps: normal;
          font-weight: 400; letter-spacing: normal; orphans: 2;
          text-align: left; text-indent: 0px; text-transform: none;
          white-space: normal; widows: 2; word-spacing: 0px;
          -webkit-text-stroke-width: 0px; background-color: rgb(255,
          255, 255); text-decoration-style: initial;
          text-decoration-color: initial;">
          <pre class="wordwrap" style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, &quot;Liberation Mono&quot;, &quot;Courier New&quot;, monospace; font-size: 12.25px; margin-top: 0px; margin-bottom: 1rem; overflow: auto; display: block; color: rgb(33, 37, 41); white-space: pre-wrap; overflow-wrap: normal; word-break: normal; padding: 0px;">On Mar 23, 2020, at 5:17 PM, Tony Rutkowski <a href="mailto:&amp;lt;rutkowski.tony@gmail.com&amp;gt;" style="box-sizing: border-box; color: rgb(51, 122, 183); text-decoration: none; background-color: transparent;">&lt;rutkowski.tony@gmail.com&gt;</a> wrote:
&gt; 
&gt; Has anyone done an analysis of the antitrust implications of this work under an IETF aegis?  Has the IETF Trust bought off on this?

Not that has reported to this group.

&gt; The work here is similar that undertaken for The Handle System, and the CNRI work in ITU to develop X.1255 and related treaty instrument resolutions.

In what way is it "similar"? Various ways of doing discovery have been done for over 30 years.

--Paul Hoffman</pre>
        </div>
      </blockquote>
      <br>
    </p>
  </body>
</html>

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Subject: Re: [Add] [Ext] antitrust implications of IETF resolver discovery protocol work
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Date: Tue, 24 Mar 2020 12:33:40 +0100 (CET)
From: Vittorio Bertola <vittorio.bertola@open-xchange.com>
To: "Deen, Glenn (NBCUniversal)" <Glenn.Deen@nbcuni.com>
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Subject: Re: [Add] [Ext] antitrust implications of IETF resolver discovery protocol work
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>     Il 24/03/2020 03:44 Deen, Glenn (NBCUniversal) <glenn.deen@nbcuni.com=
> ha scritto:
>=20
>=20
>     What anti trust aspects are being suggested for discovery of dns reso=
lvers and mechanisms to convey resolver information ?
>=20
>     I don=E2=80=99t see what the possible concerns are.=20
>=20
Actually, antitrust concerns have been raised about deployment models in wh=
ich discovery is *not* being done, as they attribute to whoever controls th=
e client the ability to also determine or constrain the resolver that is be=
ing used, thus giving people with a strong position in the former market al=
so a strong influence on the latter one. Having a discovery mechanism could=
 provide a way to alleviate those concerns, for those that find them reason=
able.

--

Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
vittorio.bertola@open-xchange.com mailto:vittorio.bertola@open-xchange.com=
=20
Office @ Via Treviso 12, 10144 Torino, Italy

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<!doctype html>
<html>
 <head>=20
  <meta charset=3D"UTF-8">=20
 </head>
 <body>
  <div>
   <br>
  </div>
  <blockquote type=3D"cite">
   <div>
    Il 24/03/2020 03:44 Deen, Glenn (NBCUniversal) &lt;glenn.deen@nbcuni.co=
m&gt; ha scritto:
   </div>
   <div>
    <br>
   </div>
   <div>
    <br>
   </div>
   <div dir=3D"ltr">
    What anti trust aspects are being suggested for discovery of dns resolv=
ers and mechanisms to convey resolver information ?
   </div>
   <div dir=3D"ltr">
    <br>
   </div>
   <div dir=3D"ltr">
    I don=E2=80=99t see what the possible concerns are.&nbsp;
   </div>
  </blockquote>
  <div>
   Actually, antitrust concerns have been raised about deployment models in=
 which discovery is *not* being done, as they attribute to whoever controls=
 the client the ability to also determine or constrain the resolver that is=
 being used, thus giving people with a strong position in the former market=
 also a strong influence on the latter one. Having a discovery mechanism co=
uld provide a way to alleviate those concerns, for those that find them rea=
sonable.
   <br>
  </div>
  <div class=3D"io-ox-signature">
   <p>-- <br class=3D""></p>
   <pre class=3D"">Vittorio Bertola | Head of Policy &amp; Innovation, Open=
-Xchange<br><a href=3D"mailto:vittorio.bertola@open-xchange.com">vittorio.b=
ertola@open-xchange.com</a> <br>Office @ Via Treviso 12, 10144 Torino, Ital=
y</pre>
  </div>=20
 </body>
</html>
------=_Part_3951_1375223979.1585049620851--


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> On 24 Mar 2020, at 00:17, Tony Rutkowski <rutkowski.tony@gmail.com> =
wrote:
>=20
> Has anyone done an analysis of the antitrust implications of this work =
under an IETF aegis?  Has the IETF Trust bought off on this?

Can you explain why you think there might be anti-trust implications?

> The work here is similar that undertaken for The Handle System, and =
the CNRI work in ITU to develop X.1255 and related treaty instrument =
resolutions.

How? The ADD WG hasn=E2=80=99t even met yet or adopted any documents as =
WG drafts. So it=E2=80=99s hard to see how there is any basis for your =
claim.



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On 24 Mar 2020, at 01:21, Tony Rutkowski <rutkowski.tony@gmail.com> =
wrote:
>=20
> Bob can speak as to the similarities and why The Handle System might =
be better here, or a competitive alternative.

IMO it=E2=80=99s incumbent on you to do this since you raised this =
issue. Please explain. Though that=E2=80=99s probably off-topic for this =
list and WG.

The ADD WG is looking at discovery for services using DNS-based lookup =
technologies, not those using The Handle System (tm). Those two lookup =
mechanisms are orthogonal to each other and may well be mutually =
exclusive.

The WG=E2=80=99s charter -- ADD is an acronym for Adaptive DNS Discovery =
BTW -- actually says "This working group will focus on discovery and =
selection of DNS resolvers by DNS clients in a variety of networking =
environments=E2=80=9D. There=E2=80=99s no mention of X.1255 or The =
Handle System at all.

I=E2=80=99m puzzled why you have raised what seems to be a couple of =
non-sequiturs.


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To: Jim Reid <jim@rfc1035.com>
Cc: Add@ietf.org, Robert Kahn <rkahn@cnri.reston.va.us>
References: <5c9880d8-d03c-d28f-08b8-5f704270ed56@gmail.com> <BD1F72F3-32F1-448E-AFC7-C38A2B6F33CA@rfc1035.com>
From: Tony Rutkowski <rutkowski.tony@gmail.com>
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Date: Tue, 24 Mar 2020 08:34:34 -0400
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Subject: Re: [Add] [Ext] antitrust implications of IETF resolver discovery protocol work
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Hi Jim,

This is a subject of active discussion among parties analyzing the 
resolver system marketplace - which will scale significantly in a 5G 
environment.  The arena is in the process of becoming much more 
competitive and diverse.  Your note itself raises some flags about it 
being focused on only DNS-based lookup technologies.  Why not a broader 
array of resolver technologies - especially when the ADD remit is "in a 
variety of networking environments, including public networks, private 
networks, and VPNs."  It also seems like somebody was concerned about 
the anti-competitive implications with the addition of a subsequent 
caveat "making any recommendations about specific policies for clients 
or servers is out of scope."  The concern is also amplified by IETF 
proclivities to claim dominion over all implementations of TCP/IP and 
DNS protocols and the utter lack of any anti-trust policies or review 
processes.

It seems past due to get something published and vetted on a significant 
scale.  5G implementations will open up a new universe of virtualised 
architectures, services, and protocols; as the world moves to 
alternative IP and layer 2 protocols, end point identifiers, and 
discovery/resolver services.

--tony



On 2020-03-24 8:09 AM, Jim Reid wrote:
> On 24 Mar 2020, at 01:21, Tony Rutkowski <rutkowski.tony@gmail.com> wrote:
>> Bob can speak as to the similarities and why The Handle System might be better here, or a competitive alternative.
> IMO it’s incumbent on you to do this since you raised this issue. Please explain. Though that’s probably off-topic for this list and WG.
>
> The ADD WG is looking at discovery for services using DNS-based lookup technologies, not those using The Handle System (tm). Those two lookup mechanisms are orthogonal to each other and may well be mutually exclusive.
>
> The WG’s charter -- ADD is an acronym for Adaptive DNS Discovery BTW -- actually says "This working group will focus on discovery and selection of DNS resolvers by DNS clients in a variety of networking environments”. There’s no mention of X.1255 or The Handle System at all.
>
> I’m puzzled why you have raised what seems to be a couple of non-sequiturs.
>


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Subject: Re: [Add] [Ext] antitrust implications of IETF resolver discovery protocol work
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> On 24 Mar 2020, at 12:34, Tony Rutkowski <rutkowski.tony@gmail.com> =
wrote:
>=20
> This is a subject of active discussion among parties analyzing the =
resolver system marketplace - which will scale significantly in a 5G =
environment.

Who are these parties and where are those discussions taking place?

> The arena is in the process of becoming much more competitive and =
diverse.

Is it? Where? How?

> Your note itself raises some flags about it being focused on only =
DNS-based lookup technologies.  Why not a broader array of resolver =
technologies - especially when the ADD remit is "in a variety of =
networking environments, including public networks, private networks, =
and VPNs."=20

Have you followed the long and tortuous process which lead to the =
formation of the ADD WG? The charter=E2=80=99s scope had to be carefully =
focused because (a) something diffuse was never going to result in =
useful output in a reasonable time-frame; (b) the IETF wouldn=E2=80=99t =
have been able to reach consensus on the creation of the new WG.

Asking for the WG to assimilate every flavour-of-the-month alternative =
to DNS at this stage is ill-judged and *very* premature. The WG hasn=E2=80=
=99t even met yet and you seem to want it rechartered. Hmmm.


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Subject: Re: [Add] [Ext] antitrust implications of IETF resolver discovery protocol work
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Hi everyone,

This discussion has been moved off list as this is not in scope for the WG =
- please focus on list  discussion to ADD technical matters on discovery an=
d resolver info conveyance. =20

Thanks
Glenn=20


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Date: Wed, 25 Mar 2020 15:36:51 +1100
From: "Martin Thomson" <mt@lowentropy.net>
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Subject: [Add] My principles for discovery
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As I raised this in the meeting, I think that it's only fair that I include what I think the principles should be.

In short, I believe that any entity that you interact with should be able to present their views on what resolver you should use.  Client policy will then dictate which - if any - of those is used.  Authentication of the source of these opinions is likely a necessary input for the client policy decision.

It is discussing client policy that has caused us to get into unproductive discussions.  To be clear, I regard the question of whether it is users or the software they choose to run that make policy decisions to be firmly part of this discussion.  We might variously lament the ability of software to properly reflect the wishes of users, but this is not the place to debate that.

That doesn't mean that you should expect the person serving you sausages at a local deli to offer an opinion on what resolver you should use.  But we should look to provide ways in which entities that have some relevant stake to make their opinion known.  As a provider of application software that might be interested in having its own policies, I might expect to receive opinions from the following places:

* The networks that endpoints connect to.
* DNS servers that might be involved in answering queries.
* Other communication endpoints, such as sites or enterprise services, and their representatives, such as CDNs or corporate IT.

These next three might not depend on a protocol that we define here, but we can still recognize that there might be other entities involved in expressing opinions and - for these - even setting policy:

* The operating system configuration.
* Various "owners" or stakeholders for the endpoint, such as an employer or a government (this might not extend all the way to full control of the device MDM-style, but it might still be relevant to the client policy).
* Application configuration.

I don't personally see a lot of value in having entities other than those from the first set of three stand on soapboxes to broadcast their opinions about resolver choice, but there is nothing fundamentally wrong with having other sources of opinions.  So while the IETF could provide more protocols, it's not a good use of our time and resources unless we expect that the information would be acceptable to genuine client policies.

When it comes to setting policy, authentication is important.  When making a decision about whether to use a particular resolver, depending on the policy you have, it might be important that you know whose opinion is guiding the decision.  If you want a server that doesn't store logs of queries for longer than a certain time, then I'm not aware of a technical mechanism for verifying that claim.  You likely have to rely on the assertions of an entity you trust.  Opinions received over the delicatessen counter are unlikely to carry any particular weight.

It was good to see both Tommy and Dan address this question directly; though I'm not sure I totally agree that the right trust anchors were used, building in ways to authenticate an opinion makes it more likely that client policy will allow use of the indicated resolver.

I think that the need to be flexible about authenticity derives largely from the desire to allow networks to have an opinion.  I know of no way to authenticate the output of DHCP or a RA, except to say that this is most likely the provider of the network who is speaking.  That's very weak authentication, so while it carries some weight, it's not a lot.

So, I would suggest that the best we can hope for from this WG is a set of mechanisms that report on resolver options/opinions and some associated information that includes who provided the option/opinion and how.

Cheers,
Martin

p.s., Regarding work on the table, I think that it is clear what the models are driving draft-btw-add-home, draft-peterson-do[th]-dhcp, and draft-pauly-dprive-adaptive-dns-privacy.  I struggle a little with draft-mglt-add-rdp in this regard and I would appreciate a little more clarity about intent.  It is possible that draft-reddy-add-server-policy-selection is firmly in the authentication space, but it seems to be more firmly aimed at communicating policy than I am currently comfortable with right now.


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Date: Wed, 25 Mar 2020 08:32:57 +0100 (CET)
From: Vittorio Bertola <vittorio.bertola@open-xchange.com>
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Subject: Re: [Add] My principles for discovery
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> Il 25/03/2020 05:36 Martin Thomson <mt@lowentropy.net> ha scritto:
> 
>  
> As I raised this in the meeting, I think that it's only fair that I include what I think the principles should be.
> 
> In short, I believe that any entity that you interact with should be able to present their views on what resolver you should use.  Client policy will then dictate which - if any - of those is used.

I don't necessarily disagree with the approach, but there is a question to which I need a very convincing answer first.

"Any entity you interact with" already has a way to tell you - even force you - to use a name server they control to effect resolution of their domain names. It's called "authoritative name server".

It seems to me that the model that especially draft-pauly is proposing - i.e. every destination pointing the client to a resolver that the destination controls - is functionally equivalent, in terms of who gets to see which information, to eliminating the concept of an external resolver and having the end-user device implement and run a full resolver on its own.

This, as per Tommy's reply to the question I made at IETF 106, would increase privacy because the resolution process would not provide data to any other party than the "final destination", which would anyway get it when the following HTTPS connection happens. (The fact that the two sets of data are actually the same has been challenged yesterday in the Jabber chat, but that's another discussion.)

I assume that this is also what you are envisaging, since the alternative - every destination pointing the client to a resolver which they don't control, but with which they have commercial or other agreements - opens up the potential for much heavier security threat, centralization and surveillance scenarios than it is ever possible today, so I would expect it to be ruled out much like other out-of-same-origin practices.

So - why do we need to develop all this complex machinery just to let destinations indicate some kind of resolver that does the same thing that their authoritative already does? What's the difference with just implementing a full resolver in the client?

-- 
 
Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
vittorio.bertola@open-xchange.com 
Office @ Via Treviso 12, 10144 Torino, Italy


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From: Ben Schwartz <bemasc@google.com>
Date: Wed, 25 Mar 2020 14:40:33 -0400
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To: Vittorio Bertola <vittorio.bertola=40open-xchange.com@dmarc.ietf.org>
Cc: Martin Thomson <mt@lowentropy.net>, ADD Mailing list <add@ietf.org>
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Subject: Re: [Add] My principles for discovery
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On Wed, Mar 25, 2020 at 3:33 AM Vittorio Bertola <vittorio.bertola=
40open-xchange.com@dmarc.ietf.org> wrote:

>
>
> > Il 25/03/2020 05:36 Martin Thomson <mt@lowentropy.net> ha scritto:
> >
> >
> > As I raised this in the meeting, I think that it's only fair that I
> include what I think the principles should be.
> >
> > In short, I believe that any entity that you interact with should be
> able to present their views on what resolver you should use.  Client policy
> will then dictate which - if any - of those is used.
>
> I don't necessarily disagree with the approach, but there is a question to
> which I need a very convincing answer first.
>
> "Any entity you interact with" already has a way to tell you - even force
> you - to use a name server they control to effect resolution of their
> domain names. It's called "authoritative name server".
>
> It seems to me that the model that especially draft-pauly is proposing -
> i.e. every destination pointing the client to a resolver that the
> destination controls - is functionally equivalent, in terms of who gets to
> see which information, to eliminating the concept of an external resolver
> and having the end-user device implement and run a full resolver on its own.
>
> This, as per Tommy's reply to the question I made at IETF 106, would
> increase privacy because the resolution process would not provide data to
> any other party than the "final destination", which would anyway get it
> when the following HTTPS connection happens. (The fact that the two sets of
> data are actually the same has been challenged yesterday in the Jabber
> chat, but that's another discussion.)
>
> I assume that this is also what you are envisaging, since the alternative
> - every destination pointing the client to a resolver which they don't
> control, but with which they have commercial or other agreements - opens up
> the potential for much heavier security threat, centralization and
> surveillance scenarios than it is ever possible today, so I would expect it
> to be ruled out much like other out-of-same-origin practices.
>

I don't think this is a meaningful distinction.  Authoritative nameserver
operations are commonly outsourced and heavily consolidated today, just as
web hosting is commonly outsourced to large CDNs.  There's certainly no
"out-of-same-origin" rule that prevents using a CDN!


> So - why do we need to develop all this complex machinery just to let
> destinations indicate some kind of resolver that does the same thing that
> their authoritative already does? What's the difference with just
> implementing a full resolver in the client?
>

I actually agree, at least in part: as our proposals develop, we should try
to harmonize them with the work to encrypt recursive->authoritative DNS
queries.  Perhaps we will be able to build encrypted stub, recursive, and
hybrid resolvers from a small set of shared components.


>
> --
>
> Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
> vittorio.bertola@open-xchange.com
> Office @ Via Treviso 12, 10144 Torino, Italy
>
> --
> Add mailing list
> Add@ietf.org
> https://www.ietf.org/mailman/listinfo/add
>

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Mar 25, 2020 at 3:33 AM Vitto=
rio Bertola &lt;vittorio.bertola=3D<a href=3D"mailto:40open-xchange.com@dma=
rc.ietf.org">40open-xchange.com@dmarc.ietf.org</a>&gt; wrote:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>
&gt; Il 25/03/2020 05:36 Martin Thomson &lt;<a href=3D"mailto:mt@lowentropy=
.net" target=3D"_blank">mt@lowentropy.net</a>&gt; ha scritto:<br>
&gt; <br>
&gt;=C2=A0 <br>
&gt; As I raised this in the meeting, I think that it&#39;s only fair that =
I include what I think the principles should be.<br>
&gt; <br>
&gt; In short, I believe that any entity that you interact with should be a=
ble to present their views on what resolver you should use.=C2=A0 Client po=
licy will then dictate which - if any - of those is used.<br>
<br>
I don&#39;t necessarily disagree with the approach, but there is a question=
 to which I need a very convincing answer first.<br>
<br>
&quot;Any entity you interact with&quot; already has a way to tell you - ev=
en force you - to use a name server they control to effect resolution of th=
eir domain names. It&#39;s called &quot;authoritative name server&quot;.<br=
>
<br>
It seems to me that the model that especially draft-pauly is proposing - i.=
e. every destination pointing the client to a resolver that the destination=
 controls - is functionally equivalent, in terms of who gets to see which i=
nformation, to eliminating the concept of an external resolver and having t=
he end-user device implement and run a full resolver on its own.<br>
<br>
This, as per Tommy&#39;s reply to the question I made at IETF 106, would in=
crease privacy because the resolution process would not provide data to any=
 other party than the &quot;final destination&quot;, which would anyway get=
 it when the following HTTPS connection happens. (The fact that the two set=
s of data are actually the same has been challenged yesterday in the Jabber=
 chat, but that&#39;s another discussion.)<br>
<br>
I assume that this is also what you are envisaging, since the alternative -=
 every destination pointing the client to a resolver which they don&#39;t c=
ontrol, but with which they have commercial or other agreements - opens up =
the potential for much heavier security threat, centralization and surveill=
ance scenarios than it is ever possible today, so I would expect it to be r=
uled out much like other out-of-same-origin practices.<br></blockquote><div=
><br></div><div>I don&#39;t think this is a meaningful distinction.=C2=A0 A=
uthoritative nameserver operations are commonly outsourced and heavily cons=
olidated today, just as web hosting is commonly outsourced to large CDNs.=
=C2=A0 There&#39;s certainly no &quot;out-of-same-origin&quot; rule that pr=
events using a CDN!</div><div>=C2=A0</div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex">
So - why do we need to develop all this complex machinery just to let desti=
nations indicate some kind of resolver that does the same thing that their =
authoritative already does? What&#39;s the difference with just implementin=
g a full resolver in the client?<br></blockquote><div><br></div><div>I actu=
ally agree, at least in part: as our proposals develop, we should try to ha=
rmonize them with the work to encrypt recursive-&gt;authoritative DNS queri=
es.=C2=A0 Perhaps we will be able to build encrypted stub, recursive, and h=
ybrid resolvers from a small set of shared components.</div><div>=C2=A0</di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
-- <br>
<br>
Vittorio Bertola | Head of Policy &amp; Innovation, Open-Xchange<br>
<a href=3D"mailto:vittorio.bertola@open-xchange.com" target=3D"_blank">vitt=
orio.bertola@open-xchange.com</a> <br>
Office @ Via Treviso 12, 10144 Torino, Italy<br>
<br>
-- <br>
Add mailing list<br>
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</blockquote></div></div>

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From: Patrick McManus <mcmanus@ducksong.com>
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Subject: Re: [Add] My principles for discovery
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On Wed, Mar 25, 2020 at 12:37 AM Martin Thomson <mt@lowentropy.net> wrote:

>
> In short, I believe that any entity that you interact with should be able
> to present their views on what resolver you should use.  Client policy will
> then dictate which - if any - of those is used.  Authentication of the
> source of these opinions is likely a necessary input for the client policy
> decision.
>
>
I think this is a pretty strong summary and a useful contribution -
thanks!. I might add that their view may include the scope of their
recommendation. (e.g. I'm a general recursive, I'm for this split horizon,
I'm for this authoritative, etc...) and, if we were making mission
statements, emphasize that authentication is something they are implicitly
conveying during presentation (even if its the absence of authentication).



>

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Mar 25, 2020 at 12:37 AM Mart=
in Thomson &lt;<a href=3D"mailto:mt@lowentropy.net">mt@lowentropy.net</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
In short, I believe that any entity that you interact with should be able t=
o present their views on what resolver you should use.=C2=A0 Client policy =
will then dictate which - if any - of those is used.=C2=A0 Authentication o=
f the source of these opinions is likely a necessary input for the client p=
olicy decision.<br>
<br></blockquote><div><br></div><div>I think this is a pretty strong summar=
y and a useful contribution - thanks!. I might add that their view may incl=
ude the scope of their recommendation. (e.g. I&#39;m a general recursive, I=
&#39;m for this split horizon, I&#39;m for this authoritative, etc...) and,=
 if we were making mission statements, emphasize that authentication is som=
ething they are implicitly conveying during presentation (even if its the a=
bsence of authentication).</div><div><br></div><div><br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex"><br>
</blockquote></div></div>

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From: Rob Sayre <sayrer@gmail.com>
Date: Wed, 25 Mar 2020 12:59:07 -0700
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To: "Deen, Glenn" <Glenn_Deen@comcast.com>
Cc: ADD Mailing list <add@ietf.org>, "add-chairs@ietf.org" <add-chairs@ietf.org>
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Subject: Re: [Add] ADD Virtual WG Tuesday March 24, 2000-2200 UTC
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Hi all,

The recording of this session is available on YouTube now:
https://www.youtube.com/watch?v=3DV0nIZWU4bH0

thanks,
Rob



On Thu, Mar 19, 2020 at 2:19 PM Deen, Glenn <Glenn_Deen@comcast.com> wrote:

> HI Everyone,
>
>
>
> Here=E2=80=99s some more information and preparation material for next Tu=
esday=E2=80=99s
> ADD WG Virtual meeting.
>
>
>
> Time:  2000-2200 UTC
>
> Date:  Tuesday March 24, 2020
>
> Location: WebEx
>
>
>
>
>
> Webex Info will be available on the IETF107 Meetnig Agenda Page:
> https://datatracker.ietf.org/meeting/107/agenda
>
>
>
>
>
> You=E2=80=99ll also find the link there to the ADD Etherpad which for thi=
s virtual
> session is going to also be used for Blue-Sheets.Attendees are asked to
> visit and enter your Name+Affiliation in the Blue-Sheet section of the AD=
D
> Etherpad.
>
>
>
>
>
>
>
> Draft Agenda for IETF107
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
>
> 1.              Introduction to ADD WG    [Chairs ]
>
> 2.              Agenda Bash
>
> 3. 15min   draft-arkko-abcd-distributed-resolver-selection  [Jari
> Arkko/Ted Hardie ]
>
> 4. 15min   discovery-selection directions  [Tommy Pauly  ]
>
> 5. 15min   draft-btw-add-home  [ Dan Wing]
>
> 6. 15min   draft-reddy-dprive-bootstrap-dns-server [Dan Wing]
>
> 7. 15min   draft-mglt-add-rdp  [Daniel Migault]
>
> 8. 15min   ADD Q&A  [Chairs et al]
>
>
>
>
>
> Holding this as a virtual meeting is a first for the IETF and the first
> meeting for ADD as well, so to make this as smooth as an experience for
> everyone please join the ADD session at 2000 UTC and be ready.
>
>
>
> When you connect into WebEx you should start off as auto-muted so you=E2=
=80=99ll
> need to unmute yourself to speak.   We won=E2=80=99t be using video strea=
ming of
> presenter during the session, they=E2=80=99ll be on audio and their slide=
s will
> appear on screen.   The same goes for questions from the audience  - audi=
o
> only.
>
>
>
> Mic Line Queue
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> The Mic Line will use the WebEx chat channel.  To get in the queue type q=
+
> to leave type q-.       Please don=E2=80=99t type questions or other thin=
gs into
> the WebEx chat channel as that will make managing the queue very hard for
> the chairs.  Please use the Jabber channel for side conversations.
>
>
>
>
>
> Helpful Info & Prep
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
>
> The IETF has prepared some material to help get everyone ready, including
> a reminder that you need to register for IETF107 as a remote participant =
to
> join remotely.
>
>
>
> Please read and follow the actions in:
> https://www.ietf.org/how/meetings/107/session-participant-guide/
>
>
>
> Finally, don=E2=80=99t forget to register as a remote participant for IET=
F107 at:
> https://www.ietf.org/how/meetings/register/
>
>
>
> Volunteers?
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
>
> We need volunteer(s) to help take notes to etherpad and to watch Jabber
> for questions.   If you=E2=80=99re willing please let the chairs (
> add-chairs@ietf.org) know.
>
>
>
>
>
> Regards,
>
> Dave and Glenn
>
>
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<div dir=3D"ltr">Hi all,<div><br></div><div>The recording of this session i=
s available on YouTube now:</div><div><a href=3D"https://www.youtube.com/wa=
tch?v=3DV0nIZWU4bH0">https://www.youtube.com/watch?v=3DV0nIZWU4bH0</a><br><=
/div><div><br></div><div>thanks,</div><div>Rob</div><div><br></div><div><br=
></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Thu, Mar 19, 2020 at 2:19 PM Deen, Glenn &lt;<a href=3D"mailto:Gl=
enn_Deen@comcast.com">Glenn_Deen@comcast.com</a>&gt; wrote:<br></div><block=
quote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1=
px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-4601618629695092484WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">HI Everyone,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">Here=E2=80=99s some more information and preparation material =
for next Tuesday=E2=80=99s ADD WG Virtual meeting.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">Time:=C2=A0 2000-2200 UTC<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">Date:=C2=A0 Tuesday March 24, 2020<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">Location: WebEx<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">Webex Info will be available on the IETF107 Meetnig Agenda Pag=
e:=C2=A0
<a href=3D"https://datatracker.ietf.org/meeting/107/agenda" target=3D"_blan=
k">https://datatracker.ietf.org/meeting/107/agenda</a><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">You=E2=80=99ll also find the link there to the ADD Etherpad wh=
ich for this virtual session is going to also be used for Blue-Sheets.Atten=
dees are asked to visit and enter your Name+Affiliation
 in the Blue-Sheet section of the ADD Etherpad.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">Draft Agenda for IETF107=C2=A0</span><span style=3D"color:blac=
k"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</=
span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">=C2=A0</span><span style=3D"color:black"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">1.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Introduction to ADD WG=C2=A0 =C2=A0=C2=A0[Chairs ]</span=
><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">2.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Agenda Bash</span><span style=3D"color:black"><u></u><u>=
</u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">3. 15min=C2=A0=C2=A0 draft-arkko-abcd-distributed-resolver-sel=
ection=C2=A0=C2=A0[Jari Arkko/Ted Hardie ]</span><span style=3D"color:black=
"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">4. 15min=C2=A0=C2=A0=C2=A0discovery-selection directions=C2=A0=
 [Tommy Pauly=C2=A0=C2=A0]</span><span style=3D"color:black"><u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">5. 15min=C2=A0=C2=A0 draft-btw-add-home=C2=A0=C2=A0[ Dan Wing]=
</span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">6. 15min=C2=A0=C2=A0 draft-reddy-dprive-bootstrap-dns-server [=
Dan Wing]</span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">7. 15min=C2=A0=C2=A0 draft-mglt-add-rdp=C2=A0=C2=A0[Daniel Mig=
ault]</span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">8.=C2=A015min=C2=A0=C2=A0 ADD Q&amp;A=C2=A0=C2=A0[Chairs et al=
]<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:Helvetica;color:black">=
=C2=A0</span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">Holding this as a virtual=
 meeting is a first for the IETF and the first meeting for ADD as well, so =
to make this as smooth as an experience for everyone please join the ADD se=
ssion at 2000 UTC and be ready.=C2=A0<span class=3D"gmail-m_-46016186296950=
92484apple-converted-space">=C2=A0</span></span><span style=3D"color:black"=
><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">=C2=A0</span><span style=
=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">When you connect into Web=
Ex you should start off as auto-muted so you=E2=80=99ll need to unmute your=
self to speak.=C2=A0=C2=A0 We won=E2=80=99t be using video streaming of pre=
senter during the session, they=E2=80=99ll be on audio and their slides
 will appear on screen.=C2=A0=C2=A0 The same goes for questions from the au=
dience =C2=A0- audio only.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:Helvetica;color:black"><u=
></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:Helvetica;color:black">Mi=
c Line Queue<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:Helvetica;color:black">=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">The Mic Line will use th=
e WebEx chat channel.=C2=A0 To get in the queue type q+ to leave type q-.=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Please don=E2=80=99t type questions or=
 other things into the WebEx chat channel as that will make managing the qu=
eue very
 hard for the chairs.=C2=A0 Please use the Jabber channel for side conversa=
tions.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><u></u>=C2=A0<u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">=C2=A0</span><span style=
=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">Helpful Info &amp; Prep</=
span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D</span><span style=3D"color:black"><u></u><u></u></span><=
/p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">=C2=A0</span><span style=
=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">The IETF has prepared som=
e material to help get everyone ready, including a reminder that you need t=
o register for IETF107 as a remote participant to join remotely.
</span><span style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"font-variant-caps:normal;text-align:start;w=
ord-spacing:0px">
<span style=3D"font-family:Helvetica;color:black">=C2=A0=C2=A0</span><span =
style=3D"color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:Helvetica;color:black">Pl=
ease read and follow the actions in:=C2=A0<span class=3D"gmail-m_-460161862=
9695092484apple-converted-space">=C2=A0</span><a href=3D"https://www.ietf.o=
rg/how/meetings/107/session-participant-guide/" title=3D"https://www.ietf.o=
rg/how/meetings/107/session-participant-guide/" target=3D"_blank"><span sty=
le=3D"font-family:Calibri,sans-serif;color:rgb(5,99,193)">https://www.ietf.=
org/how/meetings/107/session-participant-guide/</span></a><u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><u></u>=C2=A0<u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:black">Finally, don=E2=80=99t f=
orget to register as a remote participant for IETF107 at:=C2=A0
</span><a href=3D"https://www.ietf.org/how/meetings/register/" target=3D"_b=
lank">https://www.ietf.org/how/meetings/register/</a><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><u></u>=C2=A0<u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:black">Volunteers?<u></u><u></u=
></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><u></u>=C2=A0<u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:black">We need volunteer(s) to =
help take notes to etherpad and to watch Jabber for questions. =C2=A0=C2=A0=
If you=E2=80=99re willing please let
</span>the chairs (<a href=3D"mailto:add-chairs@ietf.org" target=3D"_blank"=
>add-chairs@ietf.org</a>) know.<span style=3D"color:black"><u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><u></u>=C2=A0<u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica;=
color:black">=C2=A0</span><span style=3D"color:black"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica"=
>Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica"=
>Dave and Glenn<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Helvetica"=
><u></u>=C2=A0<u></u></span></p>
</div>
</div>

-- <br>
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</blockquote></div>

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Thanks for this summary, Martin. I completely agree that our focus on =
discovery as a group needs to be around how the entities a client =
interacts with offer resolver options to use, along with authentication =
of these options. The policy decisions of how to use the information is =
definitionally up to the client, and are not for this group to decide.

I also agree that the entities that might have opinions about resolver =
selection that are not a client device=E2=80=99s local network, or a =
server that the device interacts with during usage (such as the OS, =
application, or MDM configuration) belongs out of scope of any =
mechanisms we define here. Those boil down to a client policy. I =
certainly believe that operating systems and applications should be able =
to implement overriding policies for resolver selection, generally by =
user opt-in, but such an option is not part of =E2=80=9Cdiscovery=E2=80=9D=
.

Any case in which a device dynamically chooses to use a discovered =
resolver does need to have some sort of authentication. Opinions from =
entities that the client does not have a relationship with are not =
useful.

However, when we discuss authentication of the resolver information, we =
may want to separate out:
- the fact that a given DoT/DoH resolver exists
- the opinion that a client *should* use this resolver for any given =
queries

I=E2=80=99d posit that the second part here is the more critical to =
authenticate.

I think any proposal that involves local-network provisioning (be that =
DHCP, RA, or a local PvD) can only provide the first part of indicating =
that a given resolver exists. I=E2=80=99d certainly prefer some =
signaling mechanism that is not too easy to spoof (hence my suggestion =
for the HTTPS-provided PvD JSON blob), but it=E2=80=99s relatively safe =
for a client to be aware of a resolver as long as it does not choose to =
use it until it learns more about it. Some solutions can provide =
authentication along with initial discovery (DNSSEC signed records, =
say), but the end set of solutions could include a combination of =
unauthenticated protocols for discovery that require later confirmation.

Thanks,
Tommy

> On Mar 24, 2020, at 9:36 PM, Martin Thomson <mt@lowentropy.net> wrote:
>=20
> As I raised this in the meeting, I think that it's only fair that I =
include what I think the principles should be.
>=20
> In short, I believe that any entity that you interact with should be =
able to present their views on what resolver you should use.  Client =
policy will then dictate which - if any - of those is used.  =
Authentication of the source of these opinions is likely a necessary =
input for the client policy decision.
>=20
> It is discussing client policy that has caused us to get into =
unproductive discussions.  To be clear, I regard the question of whether =
it is users or the software they choose to run that make policy =
decisions to be firmly part of this discussion.  We might variously =
lament the ability of software to properly reflect the wishes of users, =
but this is not the place to debate that.
>=20
> That doesn't mean that you should expect the person serving you =
sausages at a local deli to offer an opinion on what resolver you should =
use.  But we should look to provide ways in which entities that have =
some relevant stake to make their opinion known.  As a provider of =
application software that might be interested in having its own =
policies, I might expect to receive opinions from the following places:
>=20
> * The networks that endpoints connect to.
> * DNS servers that might be involved in answering queries.
> * Other communication endpoints, such as sites or enterprise services, =
and their representatives, such as CDNs or corporate IT.
>=20
> These next three might not depend on a protocol that we define here, =
but we can still recognize that there might be other entities involved =
in expressing opinions and - for these - even setting policy:
>=20
> * The operating system configuration.
> * Various "owners" or stakeholders for the endpoint, such as an =
employer or a government (this might not extend all the way to full =
control of the device MDM-style, but it might still be relevant to the =
client policy).
> * Application configuration.
>=20
> I don't personally see a lot of value in having entities other than =
those from the first set of three stand on soapboxes to broadcast their =
opinions about resolver choice, but there is nothing fundamentally wrong =
with having other sources of opinions.  So while the IETF could provide =
more protocols, it's not a good use of our time and resources unless we =
expect that the information would be acceptable to genuine client =
policies.
>=20
> When it comes to setting policy, authentication is important.  When =
making a decision about whether to use a particular resolver, depending =
on the policy you have, it might be important that you know whose =
opinion is guiding the decision.  If you want a server that doesn't =
store logs of queries for longer than a certain time, then I'm not aware =
of a technical mechanism for verifying that claim.  You likely have to =
rely on the assertions of an entity you trust.  Opinions received over =
the delicatessen counter are unlikely to carry any particular weight.
>=20
> It was good to see both Tommy and Dan address this question directly; =
though I'm not sure I totally agree that the right trust anchors were =
used, building in ways to authenticate an opinion makes it more likely =
that client policy will allow use of the indicated resolver.
>=20
> I think that the need to be flexible about authenticity derives =
largely from the desire to allow networks to have an opinion.  I know of =
no way to authenticate the output of DHCP or a RA, except to say that =
this is most likely the provider of the network who is speaking.  That's =
very weak authentication, so while it carries some weight, it's not a =
lot.
>=20
> So, I would suggest that the best we can hope for from this WG is a =
set of mechanisms that report on resolver options/opinions and some =
associated information that includes who provided the option/opinion and =
how.
>=20
> Cheers,
> Martin
>=20
> p.s., Regarding work on the table, I think that it is clear what the =
models are driving draft-btw-add-home, draft-peterson-do[th]-dhcp, and =
draft-pauly-dprive-adaptive-dns-privacy.  I struggle a little with =
draft-mglt-add-rdp in this regard and I would appreciate a little more =
clarity about intent.  It is possible that =
draft-reddy-add-server-policy-selection is firmly in the authentication =
space, but it seems to be more firmly aimed at communicating policy than =
I am currently comfortable with right now.
>=20
> --=20
> Add mailing list
> Add@ietf.org
> https://www.ietf.org/mailman/listinfo/add


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From: "John Levine" <johnl@taugh.com>
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Subject: Re: [Add] My principles for discovery
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In article <CAOdDvNpVNbEgy3djk5aOD2FK+Tz7Bh9=zv2ZNuQYktD_mMorrg@mail.gmail.com> you write:
>I think this is a pretty strong summary and a useful contribution -
>thanks!. I might add that their view may include the scope of their
>recommendation. (e.g. I'm a general recursive, I'm for this split horizon,
>I'm for this authoritative, etc...) and, if we were making mission
>statements, emphasize that authentication is something they are implicitly
>conveying during presentation (even if its the absence of authentication).

This is reminding me of the way people used to build spam filters, and
not in a good way.  When the filters didn't do the right thing with
messages, the nerdy response was to add ever more knobs and buttons
that the users could control to manually adjust the filtering rules.

It didn't work -- most users didn't understand the controls, and for
the ones that did, or thought they did, it was a support nightmare as
they demanded ever more finegrained knobs they could try to tweak.

What everyone does now is to have a very small set of standard
filtering policies that work pretty well, typically one per system or
one per enterprise in shared systems, and to the extent users can
control their filtering, they do it implicitly by putting addresses
they know in their address book and moving messages in and out of the
spam folder.

This isn't a perfect analogy, but I'm quite confident that the fewer
decisions we expect users or their proxies to make, the more likely
this is to work.

R's,
John


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


Martin Thomson <mt@lowentropy.net> wrote:
    > As I raised this in the meeting, I think that it's only fair that I
    > include what I think the principles should be.

Thank you.

    > In short, I believe that any entity that you interact with should be
    > able to present their views on what resolver you should use.  Client
    > policy will then dictate which - if any - of those is used.
    > Authentication of the source of these opinions is likely a necessary
    > input for the client policy decision.

I find this a surprising suggestion.
Will I get different answers if I ask different entities the same question?
This seems to fall into MIF space, and I don't think that you mean to go there.

    > It is discussing client policy that has caused us to get into
    > unproductive discussions.  To be clear, I regard the question of
    > whether it is users or the software they choose to run that make policy
    > decisions to be firmly part of this discussion.  We might variously
    > lament the ability of software to properly reflect the wishes of users,
    > but this is not the place to debate that.

Agreed.

    > That doesn't mean that you should expect the person serving you
    > sausages at a local deli to offer an opinion on what resolver you
    > should use.  But we should look to provide ways in which entities that

Let me expand upon your scenario.

is it: "if you want mustard, you must ask at the counter"
or:    "if you ask at the counter, I'll give you (free) internet"

    > * The operating system configuration.
    > * Various "owners" or stakeholders for the endpoint, such as an employer or a government (this might not extend all the way to full control of the device MDM-style, but it might still be relevant to the client policy).
    > * Application configuration.

    > I don't personally see a lot of value in having entities other than
    > those from the first set of three stand on soapboxes to broadcast their
    > opinions about resolver choice, but there is nothing fundamentally
    > wrong with having other sources of opinions.  So while the IETF could
    > provide more protocols, it's not a good use of our time and resources
    > unless we expect that the information would be acceptable to genuine
    > client policies.

Agreed.

    > When it comes to setting policy, authentication is important.  When
    > making a decision about whether to use a particular resolver, depending
    > on the policy you have, it might be important that you know whose
    > opinion is guiding the decision.  If you want a server that doesn't
    > store logs of queries for longer than a certain time, then I'm not
    > aware of a technical mechanism for verifying that claim.

So, to be clear, there is running code for verifying the claim, and a
successful business transaction to do this.
RATS will give us open-standard was to execute the entire stack, but it can
be done in proprietary verticals today with third party auditors.

--
]               Never tell me the odds!                 | ipv6 mesh networks [
]   Michael Richardson, Sandelman Software Works        |    IoT architect   [
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [


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




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Vittorio Bertola <vittorio.bertola=40open-xchange.com@dmarc.ietf.org> wrote:
    > It seems to me that the model that especially draft-pauly is proposing
    > - i.e. every destination pointing the client to a resolver that the
    > destination controls - is functionally equivalent, in terms of who gets
    > to see which information, to eliminating the concept of an external
    > resolver and having the end-user device implement and run a full
    > resolver on its own.

+1.
Linking against libunbound is already a thing.  You get DNSSEC too.
We used centralized resolvers because of too little ram, and to enable
caching.

The issue that I see are:
  1) so-called "DNS" firewalls, which are imposed as a condition of internet.
     Determining how/if/when we trust them.

  2) IoT devices which have user, and which might really not have enough ram.

While there are split-horizon DNS issues that many organizations deploy
regularly, I think that they architectural concept is old, stale and broken.
IPv6 provides better mechanisms, and we should recommend them.

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




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Date: Thu, 26 Mar 2020 19:26:00 -0400
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Subject: [Add] DRDP: response to feed backs provided during the meeting
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--00000000000067e76305a1ca4f79
Content-Type: text/plain; charset="UTF-8"

Hi,

Thank you for the feed backs provided during the meeting. Here
is a response to three concerns raised during the meeting. Feel
free to let me know your thoughts.

1. One comment was that having a unique centralize repository of
resolving domains for public resolvers was a terrible idea. I
agree with this as it implies a complex governance. I will update
the draft and let it as "a" repositories for resolving domains
instead. I however believe that repositories of resolving domain
share a common format so one is able to switch easily and move
from one repo to the other.

Note that resolving domains associated to local resolvers may also
happen to be found in such repos. Currently I am not convinced
that we should envision a large number of local resolving
domains, but I am happy to hear otherwise.

2. Another comment concerned the number of resolving domains. I
think I recall that the current list of resolvers used by the
Google Public DNS is greater than 11.000. I do not know if that
list is available but I am wondering whether these entries are IP
addresses or domain names. I suspect that IP addresses are used
and that some ISPs are proposing multiple IP addresses. If that
is correct, handling resolving domains instead of IP addresses
might help reduce the length. Of course this assume sthe
discovery protocol will help discovery the IP addresses. In
addition, I am also wondering how much these entries are "public"
resolvers that are globally available. I suspect that, thought
global IP addresses may be used, their access might be limited to
DNS client that belong to a specific network. Again this is only
a suspicion and I am happy to learn more about.

Thought I am not sure I am using relevant links, the link below
mention a 50ish of domains.
https://github.com/curl/curl/wiki/DNS-over-HTTPS#publicly-available-servers
https://dnsprivacy.org/wiki/display/DP/DNS+Privacy+Test+Servers#DNSPrivacyTestServers-Publicresolvers

The link below provides much more public resolvers 11.000 public
resolving, but I suspect that most of them are open resolver. Of
course these are public, but maybe not what we expect when we
mention public resolver - which is probably why a centralized
repository is a terrible idea.  https://public-dns.info/

Overall, I have the impression that we have 11000 entries because
we are missing a discovery protocol and that a the list for
global resolver (expressed as domain) is expected to remain much
smaller.

3. Regarding the format, to be used to host a list of resolving
domain, the use of DNS messages to host the list seems to me wise
as DNS is the protocol that for sure DNS client will understand.
In addition, I believe that tcp will be able to handle large list
of domains. One drawback thought seems that we may not be able to
compress this list with gzip for example. Using a URI that
redirects to an HTTPS or FTP requires the DNS client to have
these protocols which is not given nor necessary. I am happy to
hear your thoughts on this.

Yours,
Daniel



-- 
Daniel Migault
Ericsson

--00000000000067e76305a1ca4f79
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi, <br><br>Thank you for the feed backs provided during t=
he meeting. Here<div>is a response to three concerns raised during the meet=
ing. Feel=C2=A0</div><div>free to let me know your thoughts.=C2=A0<br><br>1=
. One comment was that having a unique centralize repository of<br>resolvin=
g domains for public resolvers was a terrible idea. I<br>agree with this as=
 it implies a complex governance. I will update<br>the draft and let it as =
&quot;a&quot; repositories for resolving domains<br>instead. I however beli=
eve that repositories of resolving domain<br>share a common format so one i=
s able to switch easily and move<br>from one repo to the other. <br><br>Not=
e that resolving domains associated to local resolvers may also<br>happen t=
o be found in such repos. Currently I am not convinced<br>that we should en=
vision a large number of local resolving<br>domains, but I am happy to hear=
 otherwise. =C2=A0<br><br>2. Another comment concerned the number of resolv=
ing domains. I<br>think I recall that the current list of resolvers used by=
 the<br>Google Public DNS is greater than 11.000. I do not know if that<br>=
list is available but I am wondering whether these entries are IP<br>addres=
ses or domain names. I suspect that IP addresses are used<br>and that some =
ISPs are proposing multiple IP addresses. If that<br>is correct, handling r=
esolving domains instead of IP addresses<br>might help reduce the length. O=
f course this assume sthe<br>discovery protocol will help discovery the IP =
addresses. In<br>addition, I am also wondering how much these entries are &=
quot;public&quot;<br>resolvers that are globally available. I suspect that,=
 thought<br>global IP addresses may be used, their access might be limited =
to<br>DNS client that belong to a specific network. Again this is only<br>a=
 suspicion and I am happy to learn more about. =C2=A0<br><br>Thought I am n=
ot sure I am using relevant links, the link below<br>mention a 50ish of dom=
ains. <br><a href=3D"https://github.com/curl/curl/wiki/DNS-over-HTTPS#publi=
cly-available-servers">https://github.com/curl/curl/wiki/DNS-over-HTTPS#pub=
licly-available-servers</a><br><a href=3D"https://dnsprivacy.org/wiki/displ=
ay/DP/DNS+Privacy+Test+Servers#DNSPrivacyTestServers-Publicresolvers">https=
://dnsprivacy.org/wiki/display/DP/DNS+Privacy+Test+Servers#DNSPrivacyTestSe=
rvers-Publicresolvers</a><br><br>The link below provides much more public r=
esolvers 11.000 public<br>resolving, but I suspect that most of them are op=
en resolver. Of<br>course these are public, but maybe not what we expect wh=
en we<br>mention public resolver - which is probably why a centralized<br>r=
epository is a terrible idea. =C2=A0<a href=3D"https://public-dns.info/">ht=
tps://public-dns.info/</a><br><br>Overall, I have the impression that we ha=
ve 11000 entries because<br>we are missing a discovery protocol and that a =
the list for<br>global resolver (expressed as domain) is expected to remain=
 much<br>smaller. <br>=C2=A0 <br>3. Regarding the format, to be used to hos=
t a list of resolving<br>domain, the use of DNS messages to host the list s=
eems to me wise<br>as DNS is the protocol that for sure DNS client will und=
erstand.<br>In addition, I believe that tcp will be able to handle large li=
st<br>of domains. One drawback thought seems that we may not be able to<br>=
compress this list with gzip for example. Using a URI that<br>redirects to =
an HTTPS or FTP requires the DNS client to have<br>these protocols which is=
 not given nor necessary. I am happy to<br>hear your thoughts on this. <br>=
<br>Yours,<br>Daniel<br><br><br><div><br></div>-- <br><div dir=3D"ltr" clas=
s=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><=
div>Daniel Migault<br></div><div>Ericsson</div></div></div></div></div>

--00000000000067e76305a1ca4f79--


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Thread-Topic: [EXTERNAL] [Add] DRDP: response to feed backs provided during the meeting
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On Wed, Mar 25, 2020 at 12:37 AM Martin Thomson <mt@lowentropy.net> wrote:

> As I raised this in the meeting, I think that it's only fair that I
> include what I think the principles should be.
>
> In short, I believe that any entity that you interact with should be able
> to present their views on what resolver you should use.  Client policy will
> then dictate which - if any - of those is used.  Authentication of the
> source of these opinions is likely a necessary input for the client policy
> decision.
>
> It is discussing client policy that has caused us to get into unproductive
> discussions.  To be clear, I regard the question of whether it is users or
> the software they choose to run that make policy decisions to be firmly
> part of this discussion.  We might variously lament the ability of software
> to properly reflect the wishes of users, but this is not the place to
> debate that.
>
>  <mglt>
I think I also agree. The policy should in theory be independent
from the application enforcing that policy. The problem is that a
formal definition of what such policy is likely to never be defined,
and as such a large part of it will be defined by the
application. For that reason, the policy is likely be represented
by the application itself. In other words, not everything is being
configured by the end user and we assume the application
reflects the end user policy. - this also suppose the end user
will have the choice between different applications.

That said, the policy enforced by the application may involve
some interaction of the end user during the selection process. I
also believe that some means may be provided so the application
may notify the end user of the resulting selection.
</mglt>

 That doesn't mean that you should expect the person serving you sausages
> at a local deli to offer an opinion on what resolver you should use.  But
> we should look to provide ways in which entities that have some relevant
> stake to make their opinion known.  As a provider of application software
> that might be interested in having its own policies, I might expect to
> receive opinions from the following places:
>
> * The networks that endpoints connect to.
> * DNS servers that might be involved in answering queries.
> * Other communication endpoints, such as sites or enterprise services, and
> their representatives, such as CDNs or corporate IT.
>
>  <mglt>
The end user may have a say in the selection process.  I agree
that interaction with the end user should be limited and that
such interaction is up to the application performing the
selection. It thus sounds to me that some election parameter
should be designed to be presented to the end user. I also do not
think we should go much further than a UTF8 string.
The scenarios I would envision is that a list of resolvers is
proposed to the end user. Another thing is that when one resolver
is chosen or changed, the end user may be notified of that
change or selection.

I am unsure I clearly get the third bullet. I understand it
includes things such as:
* some configuration parameters to perform some resolutions over
* a specific resolver a web site to advertise a preferred
* resolver.
</mglt>
>
> These next three might not depend on a protocol that we define here, but
> we can still recognize that there might be other entities involved in
> expressing opinions and - for these - even setting policy:
>
> * The operating system configuration.
> * Various "owners" or stakeholders for the endpoint, such as an employer
> or a government (this might not extend all the way to full control of the
> device MDM-style, but it might still be relevant to the client policy).
> * Application configuration.
>
 <mglt>
I would see those entities as being able to configure/provide
information to the application that proceed to the selection.
</mglt>


> I don't personally see a lot of value in having entities other than those
> from the first set of three stand on soapboxes to broadcast their opinions
> about resolver choice, but there is nothing fundamentally wrong with having
> other sources of opinions.  So while the IETF could provide more protocols,
> it's not a good use of our time and resources unless we expect that the
> information would be acceptable to genuine client policies.
>
> When it comes to setting policy, authentication is important.  When making
> a decision about whether to use a particular resolver, depending on the
> policy you have, it might be important that you know whose opinion is
> guiding the decision.  If you want a server that doesn't store logs of
> queries for longer than a certain time, then I'm not aware of a technical
> mechanism for verifying that claim.  You likely have to rely on the
> assertions of an entity you trust.  Opinions received over the delicatessen
> counter are unlikely to carry any particular weight.
>
>  <mglt>
I believe the end user may decide to trust the delicateness
counter more than other ways. Think of an IETF meeting happening
nearby the deli. I am not convinced it is an easy problem to
select what the end user trust.
</mglt>

 It was good to see both Tommy and Dan address this question directly;
> though I'm not sure I totally agree that the right trust anchors were used,
> building in ways to authenticate an opinion makes it more likely that
> client policy will allow use of the indicated resolver.
>
> I think that the need to be flexible about authenticity derives largely
> from the desire to allow networks to have an opinion.  I know of no way to
> authenticate the output of DHCP or a RA, except to say that this is most
> likely the provider of the network who is speaking.  That's very weak
> authentication, so while it carries some weight, it's not a lot.
>
>  <mglt>
I think RFC3971 and RFC3118 are at least an attempt to provide
authentication. I am unaware of large deployment of these
mechanisms. DHCP / RA may provide  an IP address without
authentication, but this could be used as an hint to retrieved
authenticated information. If DHCP/RA is being spoofed, this may
end up in the resolver you connect NOT being the one proposed by
the ISP, but at least upon the selection you can trust who you
are connected to.
</mglt>

>  So, I would suggest that the best we can hope for from this WG is a set
> of mechanisms that report on resolver options/opinions and some associated
> information that includes who provided the option/opinion and how.
>
>  <mglt>
I agree.
</mglt>

 Cheers,
> Martin
>
> p.s., Regarding work on the table, I think that it is clear what the
> models are driving draft-btw-add-home, draft-peterson-do[th]-dhcp, and
> draft-pauly-dprive-adaptive-dns-privacy.  I struggle a little with
> draft-mglt-add-rdp in this regard and I would appreciate a little more
> clarity about intent.

<mglt>
I am happy to clarify anything that does not appear to be clear.

The intent is (limited) to enable the discovery resolving services
available.
All resolving services provided by example.com are listed under
_dns.example.com and selection parameters are provided through SVCB RRsets.

Since you need example.com to start the discovery, we define a repo that
contains resolving domain the dns client may consider for global resolver.
We
also define a possible way to derive the resolving domain from the local
resolver advertised by the DHCP RA.

Other ways may be defined to communicate resolving domains (DHCP
for example)

Currently the resolving domain take part of the selection by only providing
a
preference on the resolving service.

Since DNS is used to carry this information it may be requested by a dns
client
or eventually provided as additional data by a resolver the dns client
interacts with.

</mglt>


> It is possible that draft-reddy-add-server-policy-selection is firmly in
> the authentication space, but it seems to be more firmly aimed at
> communicating policy than I am currently comfortable with right now.
>
> --
> Add mailing list
> Add@ietf.org
> https://www.ietf.org/mailman/listinfo/add
>


-- 
Daniel Migault
Ericsson

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

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Mar 25, 2020=
 at 12:37 AM Martin Thomson &lt;<a href=3D"mailto:mt@lowentropy.net">mt@low=
entropy.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">As I raised this in the meeting, I think that it&#39;s only fair=
 that I include what I think the principles should be.<br>
<br>
In short, I believe that any entity that you interact with should be able t=
o present their views on what resolver you should use.=C2=A0 Client policy =
will then dictate which - if any - of those is used.=C2=A0 Authentication o=
f the source of these opinions is likely a necessary input for the client p=
olicy decision.<br>
<br>
It is discussing client policy that has caused us to get into unproductive =
discussions.=C2=A0 To be clear, I regard the question of whether it is user=
s or the software they choose to run that make policy decisions to be firml=
y part of this discussion.=C2=A0 We might variously lament the ability of s=
oftware to properly reflect the wishes of users, but this is not the place =
to debate that.<br>
<br></blockquote><div>=C2=A0&lt;mglt&gt;</div>I think I also agree. The pol=
icy should in theory be independent<br>from the application enforcing that =
policy. The problem is that a<br>formal definition of what such policy is l=
ikely to never be defined,<br>and as such a large part of it will be define=
d by the<br>application. For that reason, the policy is likely be represent=
ed<br>by the application itself. In other words, not everything is being<br=
>configured by the end user and we assume the application<br>reflects the e=
nd user policy. - this also suppose the end user<br>will have the choice be=
tween different applications.<br><br>That said, the policy enforced by the =
application may involve<br>some interaction of the end user during the sele=
ction process. I<br>also believe that some means may be provided so the app=
lication<br>may notify the end user of the resulting selection.<br>&lt;/mgl=
t&gt;<br><br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=C2=A0That d=
oesn&#39;t mean that you should expect the person serving you sausages at a=
 local deli to offer an opinion on what resolver you should use.=C2=A0 But =
we should look to provide ways in which entities that have some relevant st=
ake to make their opinion known.=C2=A0 As a provider of application softwar=
e that might be interested in having its own policies, I might expect to re=
ceive opinions from the following places:<br>
<br>
* The networks that endpoints connect to.<br>
* DNS servers that might be involved in answering queries.<br>
* Other communication endpoints, such as sites or enterprise services, and =
their representatives, such as CDNs or corporate IT.<br>
<br></blockquote><div>=C2=A0&lt;mglt&gt;</div>The end user may have a say i=
n the selection process.=C2=A0 I agree<br>that interaction with the end use=
r should be limited and that<br>such interaction is up to the application p=
erforming the<br>selection. It thus sounds to me that some election paramet=
er<br>should be designed to be presented to the end user. I also do not<br>=
think we should go much further than a UTF8 string.<br>The scenarios I woul=
d envision is that a list of resolvers is<br>proposed to the end user. Anot=
her thing is that when one resolver<br>is chosen or changed, the end user m=
ay be notified of that<br>change or selection.<br><br>I am unsure I clearly=
 get the third bullet. I understand it<br>includes things such as:<br>* som=
e configuration parameters to perform some resolutions over<br>* a specific=
 resolver a web site to advertise a preferred<br>* resolver.<br>&lt;/mglt&g=
t;<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex">
These next three might not depend on a protocol that we define here, but we=
 can still recognize that there might be other entities involved in express=
ing opinions and - for these - even setting policy:<br>
<br>
* The operating system configuration.<br>
* Various &quot;owners&quot; or stakeholders for the endpoint, such as an e=
mployer or a government (this might not extend all the way to full control =
of the device MDM-style, but it might still be relevant to the client polic=
y).<br>
* Application configuration.<br>
</blockquote><div>=C2=A0&lt;mglt&gt;</div><div>I would see those entities a=
s being able to configure/provide</div><div>information to the application =
that proceed to the selection.</div><div>&lt;/mglt&gt;</div><div>=C2=A0</di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex">
I don&#39;t personally see a lot of value in having entities other than tho=
se from the first set of three stand on soapboxes to broadcast their opinio=
ns about resolver choice, but there is nothing fundamentally wrong with hav=
ing other sources of opinions.=C2=A0 So while the IETF could provide more p=
rotocols, it&#39;s not a good use of our time and resources unless we expec=
t that the information would be acceptable to genuine client policies.<br>
<br>
When it comes to setting policy, authentication is important.=C2=A0 When ma=
king a decision about whether to use a particular resolver, depending on th=
e policy you have, it might be important that you know whose opinion is gui=
ding the decision.=C2=A0 If you want a server that doesn&#39;t store logs o=
f queries for longer than a certain time, then I&#39;m not aware of a techn=
ical mechanism for verifying that claim.=C2=A0 You likely have to rely on t=
he assertions of an entity you trust.=C2=A0 Opinions received over the deli=
catessen counter are unlikely to carry any particular weight.<br>
<br></blockquote><div>=C2=A0&lt;mglt&gt;</div>I believe the end user may de=
cide to trust the delicateness<br>counter more than other ways. Think of an=
 IETF meeting happening<br>nearby the deli. I am not convinced it is an eas=
y problem to<br>select what the end user trust.<br>&lt;/mglt&gt;<br><br><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-lef=
t:1px solid rgb(204,204,204);padding-left:1ex">=C2=A0It was good to see bot=
h Tommy and Dan address this question directly; though I&#39;m not sure I t=
otally agree that the right trust anchors were used, building in ways to au=
thenticate an opinion makes it more likely that client policy will allow us=
e of the indicated resolver.<br>
<br>
I think that the need to be flexible about authenticity derives largely fro=
m the desire to allow networks to have an opinion.=C2=A0 I know of no way t=
o authenticate the output of DHCP or a RA, except to say that this is most =
likely the provider of the network who is speaking.=C2=A0 That&#39;s very w=
eak authentication, so while it carries some weight, it&#39;s not a lot.<br=
>
<br></blockquote><div>=C2=A0&lt;mglt&gt;</div>I think RFC3971 and RFC3118 a=
re at least an attempt to provide<br>authentication. I am unaware of large =
deployment of these<br>mechanisms. DHCP / RA may provide =C2=A0an IP addres=
s without<br>authentication, but this could be used as an hint to retrieved=
<br>authenticated information. If DHCP/RA is being spoofed, this may<br>end=
 up in the resolver you connect NOT being the one proposed by<br>the ISP, b=
ut at least upon the selection you can trust who you<br>are connected to.<b=
r>&lt;/mglt&gt;<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=C2=A0=
So, I would suggest that the best we can hope for from this WG is a set of =
mechanisms that report on resolver options/opinions and some associated inf=
ormation that includes who provided the option/opinion and how.<br>
<br></blockquote><div>=C2=A0&lt;mglt&gt;</div>I agree.<br>&lt;/mglt&gt;</di=
v><div class=3D"gmail_quote"><br><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex">=C2=A0Cheers,<br>
Martin<br>
<br>
p.s., Regarding work on the table, I think that it is clear what the models=
 are driving draft-btw-add-home, draft-peterson-do[th]-dhcp, and draft-paul=
y-dprive-adaptive-dns-privacy.=C2=A0 I struggle a little with draft-mglt-ad=
d-rdp in this regard and I would appreciate a little more clarity about int=
ent.=C2=A0 </blockquote><div>&lt;mglt&gt;<br>I am happy to clarify anything=
 that does not appear to be clear.<br><br>The intent is (limited) to enable=
 the discovery resolving services available.<br>All resolving services prov=
ided by <a href=3D"http://example.com">example.com</a> are listed under<br>=
_<a href=3D"http://dns.example.com">dns.example.com</a> and selection param=
eters are provided through SVCB RRsets.<br><br>Since you need <a href=3D"ht=
tp://example.com">example.com</a> to start the discovery, we define a repo =
that<br>contains resolving domain the dns client may consider for global re=
solver. We<br>also define a possible way to derive the resolving domain fro=
m the local<br>resolver advertised by the DHCP RA.<br><br>Other ways may be=
 defined to communicate resolving domains (DHCP<br>for example)<br><br>Curr=
ently the resolving domain take part of the selection by only providing a<b=
r>preference on the resolving service.<br><br>Since DNS is used to carry th=
is information it may be requested by a dns client<br>or eventually provide=
d as additional data by a resolver the dns client<br>interacts with.<br><br=
>&lt;/mglt&gt;<br></div><div>=C2=A0</div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pa=
dding-left:1ex">It is possible that draft-reddy-add-server-policy-selection=
 is firmly in the authentication space, but it seems to be more firmly aime=
d at communicating policy than I am currently comfortable with right now.<b=
r>
<br>
-- <br>
Add mailing list<br>
<a href=3D"mailto:Add@ietf.org" target=3D"_blank">Add@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/add" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/add</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><div>Daniel Migault<br></div><d=
iv>Ericsson</div></div></div></div></div>

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From: "Martin Thomson" <mt@lowentropy.net>
To: "Vittorio Bertola" <vittorio.bertola@open-xchange.com>, add@ietf.org
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Subject: Re: [Add] My principles for discovery
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Thanks for the question.  I agree that this is hard.

On Wed, Mar 25, 2020, at 18:32, Vittorio Bertola wrote:
> "Any entity you interact with" already has a way to tell you - even 
> force you - to use a name server they control to effect resolution of 
> their domain names. It's called "authoritative name server".

This is a good point.  I hesitated before adding this to the list, because I get your point.  What Tommy proposes does look quite a bit like having the client perform recursion itself with different spelling.

But I don't think that is precisely what is being proposed, nor does it have to be designed precisely that way.  For instance, it is conceivable that I might interact with example.com and have it say things about what resolver to use for example.net without following the delegation path (and the DNSSEC chain) from the root.  A client policy in which that is permissible isn't totally implausible.

I don't think that is exactly what Tommy presented and I'm not trying to speak for that group of authors.  I'm trying to be inclusive here and allow for their design and variations on the same.  Because these are entities that *might* have a stake in the success of the eventual interaction that DNS is facilitating.  That is all.

> I assume that this is also what you are envisaging, since the 
> alternative - every destination pointing the client to a resolver which 
> they don't control, but with which they have commercial or other 
> agreements - opens up the potential for much heavier security threat, 
> centralization and surveillance scenarios than it is ever possible 
> today, so I would expect it to be ruled out much like other 
> out-of-same-origin practices.

See, I think that this line of argumentation is firmly out of scope for this group.  I think that it is fine to express your opinions about what policies a client might consider as valid, and to factor those things you identify into how those opinions are formed, but this group is setup specifically not to contemplate that.  Finding ways to express how those opinions manifest within the scope of this group's charter is what we need to try to do.  Which is awkward, but thank you for doing that here:

> So - why do we need to develop all this complex machinery just to let 
> destinations indicate some kind of resolver that does the same thing 
> that their authoritative already does? What's the difference with just 
> implementing a full resolver in the client?

Yes, this is the right question to ask, and totally within scope.  I too am not entirely convinced in the value of the complexity trade-off in the specific case you cited, but I also don't know that I really understand how this works from a hollistic perspective either.  I find the idea that I might allow Google (for example) to point me at 8.8.8.8 for the purposes of name resolutions I make within the context of my interactions with Google of interest.

Of perhaps more interest, is extending that to third party resources that are involved in the same interaction as that might allow for better scoping of how information about my DNS interactions is distributed, to go back to the resolver selection motivation.  I think that it is also has some potential pitfalls in that setup, particularly as it pertains to the distribution of information about individuals and their interests.

But that does mean - at least for me - that there is a policy that leads to something like what Tommy proposes, which might in turn motivate this group to consider designing a mechanism.  And that policy is at least plausible.

That's the careful balance this group has: we can't talk about policies because we know we don't all agree.  But we really need to understand whether there is some motivation for doing the work that is at least plausible.

This is likely a question for chairs, but if we want to avoid the policy discussions, maybe they would prefer to say that as long as there is sufficient interest then work might proceed rather than trying to avoid objections.  Or at least avoiding objections on policy grounds, because there are objections that are in scope and derive from things outside of the contested policy questions.


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From: Daniel Migault <mglt.ietf@gmail.com>
Date: Thu, 26 Mar 2020 20:46:08 -0400
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To: "Deen, Glenn (NBCUniversal)" <Glenn.Deen@nbcuni.com>
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Subject: Re: [Add] [EXTERNAL] DRDP: response to feed backs provided during the meeting
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Thanks for the feed backs Glenn. This is also an opinion I share. The main
motivation for using DNS is that DNS is for sure supported by the DNS
client.
As the repo is expected to simply return a list of domains.  One way to do
could consist in listing the resolving domains in TXT RRsets. Another way
could consists in listing these domains using PTR RRsets which would enable
sanity check over the domain name.

The current document uses the second method and the repo designated by
example.com would be represented as:

_rdns.example.com
       PTR resolving_domain_0
       PTR resolving_domain_n

One inconvenient of using DNS seems that I am not aware of mechanisms to
compress the list of resolving domain beyond the compression provided by
RFC1035. I suspect such compression will be less efficient than gzipping
the entire list but in a txt file.

Yours!
Daniel

On Thu, Mar 26, 2020 at 7:52 PM Deen, Glenn (NBCUniversal) <
Glenn.Deen@nbcuni.com> wrote:

> Without hat.
>
>
>
> On 3/26/20, 4:26 PM, "Add on behalf of Daniel Migault" <
> add-bounces@ietf.org on behalf of mglt.ietf@gmail.com> wrote:
>
>
>
> Hi,
>
> Thank you for the feed backs provided during the meeting. Here
>
> is a response to three concerns raised during the meeting. Feel
>
> free to let me know your thoughts.
>
> 1.. One comment was that having a unique centralize repository of
> resolving domains for public resolvers was a terrible idea. I
> agree with this as it implies a complex governance. I will update
> the draft and let it as "a" repositories for resolving domains
> instead. I however believe that repositories of resolving domain
> share a common format so one is able to switch easily and move
> from one repo to the other.
>
> Isn=E2=80=99t the DNS itself a global repository of domains?   Could some=
thing be
> signed and published in it?
>
>
> Yours,
> Daniel
>
>
>
> --
>
> Daniel Migault
>
> Ericsson
>


--=20
Daniel Migault
Ericsson

--0000000000000564ca05a1cb6ea3
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Thanks for the feed backs Glenn. This is also an opin=
ion I share. The main motivation for using <span id=3D"m_680417554405948022=
7:2ff.1">DNS</span> is that <span id=3D"m_6804175544059480227:2ff.2">DNS</s=
pan> is for sure supported by the <span id=3D"m_6804175544059480227:2ff.3">=
DNS</span> client.=C2=A0</div><div>As the <span id=3D"m_6804175544059480227=
:2ff.4">repo</span> is expected to simply return a list of domains.=C2=A0 O=
ne way to do could consist in listing the resolving domains in <span id=3D"=
m_6804175544059480227:2ff.5">TXT</span> <span id=3D"m_6804175544059480227:2=
ff.6">RRsets</span>. Another way could=C2=A0consists in listing these domai=
ns using <span id=3D"m_6804175544059480227:2ff.7">PTR</span> <span id=3D"m_=
6804175544059480227:2ff.8">RRsets</span> which would enable sanity check ov=
er the domain name.=C2=A0</div><div><br></div><div>The current=C2=A0documen=
t uses the second method and the <span id=3D"m_6804175544059480227:2ff.9">r=
epo</span> designated by <a href=3D"http://example.com" target=3D"_blank">e=
xample.com</a> would be represented as:</div><div><br></div><div>_<span id=
=3D"m_6804175544059480227:2ff.10">rdns</span>.<a href=3D"http://example.com=
" target=3D"_blank">example.com</a></div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0<s=
pan id=3D"m_6804175544059480227:2ff.11">PTR</span> resolving_domain_0</div>=
<div>=C2=A0 =C2=A0 =C2=A0 =C2=A0<span id=3D"m_6804175544059480227:2ff.12">P=
TR</span> resolving_domain_n</div><div><br></div><div>One inconvenient of u=
sing <span id=3D"m_6804175544059480227:2ff.13">DNS</span> seems that I am n=
ot aware of mechanisms to compress the list of resolving domain beyond the =
compression provided by RFC1035. I suspect such compression will be less ef=
ficient than <span id=3D"m_6804175544059480227:2ff.14">gzipping</span> the =
entire list but in a <span id=3D"m_6804175544059480227:2ff.15">txt</span>=
=C2=A0file.</div><div>=C2=A0=C2=A0</div><div>Yours!</div><div>Daniel</div><=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">O=
n Thu, Mar 26, 2020 at 7:52 PM Deen, Glenn (NBCUniversal) &lt;<a href=3D"ma=
ilto:Glenn.Deen@nbcuni.com" target=3D"_blank">Glenn.Deen@nbcuni.com</a>&gt;=
 wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Helvetica">Without hat.<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:Helvetica"><u></u>=C2=A0<=
u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">On 3/26/20, 4:26 PM, &qu=
ot;Add on behalf of Daniel Migault&quot; &lt;<a href=3D"mailto:add-bounces@=
ietf.org" target=3D"_blank">add-bounces@ietf.org</a> on behalf of
<a href=3D"mailto:mglt.ietf@gmail.com" target=3D"_blank">mglt.ietf@gmail.co=
m</a>&gt; wrote:<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">Hi, <br>
<br>
Thank you for the feed backs provided during the meeting. Here <u></u><u></=
u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">is a response to three c=
oncerns raised during the meeting. Feel=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
left:0.5in">
free to let me know your thoughts.=C2=A0<br>
<br>
1.. One comment was that having a unique centralize repository of<br>
resolving domains for public resolvers was a terrible idea. I<br>
agree with this as it implies a complex governance. I will update<br>
the draft and let it as &quot;a&quot; repositories for resolving domains<br=
>
instead. I however believe that repositories of resolving domain<br>
share a common format so one is able to switch easily and move<br>
from one repo to the other. <u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12pt"><span style=3D"font-fam=
ily:Helvetica">Isn=E2=80=99t the DNS itself a global repository of domains?=
=C2=A0=C2=A0 Could something be signed and published in it?<u></u><u></u></=
span></p>
<p class=3D"MsoNormal" style=3D"margin-right:0in;margin-bottom:12pt;margin-=
left:0.5in">
<br>
Yours,<br>
Daniel<br>
<br>
<u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">-- <u></u><u></u></p>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">Daniel Migault<u></u><u>=
</u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">Ericsson<u></u><u></u></=
p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>

</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
><div dir=3D"ltr"><div>Daniel Migault<br></div><div>Ericsson</div></div></d=
iv>

--0000000000000564ca05a1cb6ea3--


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In article <15470670-015C-4C13-9B14-26D74FB87AD2@nbcuni.com> you write:
>Isn’t the DNS itself a global repository of domains?   Could something be signed and published in it?

I think that has a bootstrap problem.  You don't know where to look
unless you know where to look.

If it's at a well-known DNS name, we're back to the single point of failure.

R's,
John


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Date: Fri, 27 Mar 2020 12:06:09 +1100
From: "Martin Thomson" <mt@lowentropy.net>
To: "Patrick McManus" <mcmanus@ducksong.com>
Cc: "ADD Mailing list" <add@ietf.org>
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Subject: Re: [Add] My principles for discovery
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On Thu, Mar 26, 2020, at 06:00, Patrick McManus wrote:
> I think this is a pretty strong summary and a useful contribution - 
> thanks!. I might add that their view may include the scope of their 
> recommendation. (e.g. I'm a general recursive, I'm for this split 
> horizon, I'm for this authoritative, etc...) and, if we were making 
> mission statements, emphasize that authentication is something they are 
> implicitly conveying during presentation (even if its the absence of 
> authentication).

I agree about scope.  Though the client might reach different conclusions about what of that scope they want to use. :)

The authentication question seems like it might depend on context.  If you think of an HTTP server that says "use this resolver when you talk to me if you like", then that authentication might be implicit.  But Tommy's presentation relied on authentication via DNSSEC for some sort of delegation record.  That seems like it might not be explicit.


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From: "Ralf Weber" <dns@fl1ger.de>
To: "Martin Thomson" <mt@lowentropy.net>
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Subject: Re: [Add] My principles for discovery
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On 27 Mar 2020, at 1:44, Martin Thomson wrote:
> Yes, this is the right question to ask, and totally within scope.  I 
> too am not entirely convinced in the value of the complexity trade-off 
> in the specific case you cited, but I also don't know that I really 
> understand how this works from a hollistic perspective either.  I find 
> the idea that I might allow Google (for example) to point me at 
> 8.8.8.8 for the purposes of name resolutions I make within the context 
> of my interactions with Google of interest.
Except that you have no idea when you interact with Google. When you go 
to a website these days (e.g nytimes.com - just tested this now, but 
most sites are the same or similar) you without knowing and without 
being warned (GDPR warning) already have interacted with Google. So that 
is why even for stuff that wants to interact with Google I want them to 
go to my resolver so that I can block it there.

Now I understand that there are other scenarios where distributing 
traffic might better from a privacy perspective, but we should make sure 
that whatever we do we come up with something that allows different ways 
to solve this, which IMHO Tommys draft does.

So long
-Ralf
—--
Ralf Weber


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Date: Fri, 27 Mar 2020 12:10:27 +0100 (CET)
From: Vittorio Bertola <vittorio.bertola@open-xchange.com>
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Subject: Re: [Add] My principles for discovery
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> Il 27/03/2020 01:44 Martin Thomson <mt@lowentropy.net> ha scritto:
> 
> See, I think that this line of argumentation is firmly out of scope for this group.  I think that it is fine to express your opinions about what policies a client might consider as valid, and to factor those things you identify into how those opinions are formed, but this group is setup specifically not to contemplate that.  Finding ways to express how those opinions manifest within the scope of this group's charter is what we need to try to do.  Which is awkward, but thank you for doing that here:

I don't disagree, but the problem is that discovery mechanisms are a tool to implement deployment models, which shape their requirements. But deployment models have policy consequences, some intended and some not, which once understood lead to adding features and fixes to them, which in turn need to be supported by the discovery mechanism.

So the logical order to proceed would be to imagine a deployment model, to discuss collectively its policy implications, to come to reasonable bottom-up agreement (or final disagreement) on possible mitigations, and then to design and implement a discovery mechanism that supports all that. But we cannot do that because we don't have a venue for policy discussions, and even if we had it, the discussion would take much longer than agreeing on technical specs, and could fail altogether.

So, I agree that this is not the right venue for that, but I do think that some policy discussion now, even if hard, would save us much bigger arguments later, especially with people outside of this process.

Also, we might think that we may solve the issue by designing such an open, general and extensible discovery mechanism that it can support each and every conceivable deployment model. However, that could just be wishful thinking, and it might also set the group for a very long technical odyssey before getting anywhere.

> That's the careful balance this group has: we can't talk about policies because we know we don't all agree.  But we really need to understand whether there is some motivation for doing the work that is at least plausible.
> 
> This is likely a question for chairs, but if we want to avoid the policy discussions, maybe they would prefer to say that as long as there is sufficient interest then work might proceed rather than trying to avoid objections.  Or at least avoiding objections on policy grounds, because there are objections that are in scope and derive from things outside of the contested policy questions.

A "live and let live" principle could be good: different sub-groups could work on different discovery mechanisms that suit different deployment models, which will all be standardized provided that they are technically sound.

However, I do see a problem: can you really tell technical objections from policy objections? People that don't like other people's deployment models might start to claim that their objection is technical and thus in scope. The first example I can think of: there are people that would like to just add a new option to DHCP and advertise their DoH/DoT resolver there, as they think that the level of security provided today by DHCP is sufficient; others think that this would be too insecure, and object to that mechanism on those grounds. Is that a technical or a policy objection?

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Vittorio Bertola | Head of Policy & Innovation, Open-Xchange
vittorio.bertola@open-xchange.com 
Office @ Via Treviso 12, 10144 Torino, Italy

