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Reviewer: Ron Bonica
Review result: Ready

This document is well-written. Modulo YANG doctor comments, I think that it is ready to go.



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Dear All,
as we've discussed at the MPLS WG meeting at IETF-108, I've been given an
action point to match updates to the draft-ietf-mpls-bfd-directed with the
RtgDir early review comments. Please find notes from the authors in-line
under GIM>> and Mach>> tags.
Welcome your questions, comments.

Regards,
Greg (on behalf of the authors)

---------- Forwarded message ---------
From: Carlos Pignataro <cpignata@cisco.com>
Date: Tue, Jul 11, 2017 at 7:00 AM
Subject: Rtgdir early review of draft-ietf-mpls-bfd-directed-07
To: <rtg-dir@ietf.org>
Cc: <mpls@ietf.org>, <draft-ietf-mpls-bfd-directed.all@ietf.org>, <
bfd-chairs@ietf.org>


Reviewer: Carlos Pignataro
Review result: Has Issues

Hello

I have been selected to do a routing directorate =E2=80=9Cearly=E2=80=9D re=
view of this
draft.
https://datatracker.ietf.org/doc/draft-ietf-mpls-bfd-directed/

The routing directorate will, on request from the working group chair,
perform
an =E2=80=9Cearly=E2=80=9D review of a draft before it is submitted for pub=
lication to the
IESG. The early review can be performed at any time during the draft=E2=80=
=99s
lifetime
as a working group document. The purpose of the early review depends on the
stage that the document has reached.

The MPLS chairs have requested an early review from the directorate with th=
e
objective of improving document quality.  This document has had three
unsuccessful WG LCs.

For more information about the Routing Directorate, please see
http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Document: draft-ietf-mpls-bfd-directed-07.txt
Reviewer: Carlos Pignataro
Review Date: Early July, 2017
Intended Status: Standards Track

Summary:
I have significant concerns about this document.
I also recommend a BFD WG Chair or appointee to review this document.

Comments:

First, I have a general concern about the architectural approach in this
document.

This document is modeled after RFC 7110. RFC 7110 describes the
specification
of a return path for MPLS LSP Ping. MPLS LSP Ping uses a request/reply
command/response paradigm, in which receipt of an Echo Request elicits the
generation of an Echo Reply.

BFD for MPLS, however, uses a different approach and paradigm (as per RFC
5884). An MPLS LSP Ping packet is used as a bootstrap, signaling
discriminator
value for a persistent BFD session. After the MPLS LSP Ping signals the
Discriminator (via MPLS LSP Ping TLV) to use, then BFD control messages are
sent back and forth.

However, while the BFD session is UP and  BFD control messages and being
sent
back and forth, and while no MPLS LSP Ping packets are sent after
bootstrapping
-- what happens if the return path changes (e.g., the return LSP goes down,
gets unconfigured, etc.)?
GIM>> Need to note that after bootstrapping a BFD session over MPLS LSP
with the MPLS LSP Ping that includes the BFD Discriminator TLV,
MPLS LSP Ping is periodically sent according to Section 3.2 RFC 5884:
   Hence, BFD is used in conjunction with LSP Ping for MPLS LSP fault
   detection:
...
    iii) LSP Ping is used to periodically verify the control plane
         against the data plane by ensuring that the LSP is mapped to
         the same FEC, at the egress, as the ingress.
[Mach] If the return LSP goes down, then the BFD session should go down as
well, this's one of the goals that this solution is trying to achieve. For
example, in some case, it want the forward and reverse paths share the same
route and fate.  The return path down normally means the forward path is
down as well.

In that case, not only this mechanism can actually make things worst,
because
it results in a false negative, but also the document does not specify how
the
system should recover.
[Mach] As above, this result is desired in the case that requires the
forward and reverse path share route and fate. It should be kept down until
the specified return path recovered.

The I-D seems to assume complete topological
invariability for it to work long-term, since it does not specify any
mechanism
to update or to deal with such a failure or change scenario.
GIM>> We've added the Operational Considerations section that describes how
the local BFD system using periodic MPLS LSP Ping can monitor the viability
of the Reverse path. Particularly, the text that describes this:
   If any of defined in
   [RFC7110] sub-TLVs used in BFD Reverse Path TLV, then the periodic
   verification of the control plane against the data plane, as
   recommended in Section 4 [RFC5884], MUST use the Return Path TLV, as
   per [RFC7110], with that sub-TLV.  By using the LSP Ping with Return
   Path TLV, an operator monitors whether at the egress BFD node the
   reverse LSP is mapped to the same FEC as the BFD session.  Selection
   and control of the rate of LSP Ping with Return Path TLV follows the
   recommendation of [RFC5884]: "The rate of generation of these LSP
   Ping Echo request messages SHOULD be significantly less than the rate
   of generation of the BFD Control packets.  An implementation MAY
   provide configuration options to control the rate of generation of
   the periodic LSP Ping Echo request messages."

On the other hand, there is already a BFD mechanism without the
bootstrapping
setup and with a command/response like behavior, that is S-BFD, RFC 7881.
That
one is notably missing from this draft.
GIM>> The goal of the proposed mechanism is not to avoid bootstrapping a
BFD over MPLS LSP session or simulate Echo Response/Reply behavior but to
control the path the remote BFD system uses to transmit BFD control packets
in BFD Asynchronous mode.
[Mach] The purpose of this draft is to specify a particular return path,
S-BFD cannot specify the return path, thus cannot satisfy the requirement.

Further, there seem to be a number of potentially erroneous assumptions
made,
see below.

Additional Comments:

     Bidirectional Forwarding Detection (BFD) Directed Return Path

The title should include that this is *only* for MPLS BFD.
GIM>> Thank you for the helpful editorial suggestion.

   When a BFD session monitors an explicitly routed unidirectional path
   there may be a need to direct egress BFD peer to use a specific path
   for the reverse direction of the BFD session.

Scope: is this solution targeted only for "explicitly routed unidirectional
path", and the solution to have the reply come back the exact reverse
direction? That does not seem to be the case and the solution.
GIM>> The path from the remote BFD system may traverse the same nodes and
links traversed by the BFD control packets transmitted from the ingress
LER, i.e., be co-routed. But the proposed mechanism is more generic and
allows an operator to control the path traversed by a BFD control packet
transmitted by the egress LER.

   [RFC5880], [RFC5881], and [RFC5883] established the BFD protocol for
   IP networks.  [RFC5884] and [RFC7726] set rules of using BFD
   asynchronous mode over IP/MPLS LSPs.  These standards implicitly
   assume that the egress BFD peer will use the shortest path route
   regardless of route being used to send BFD control packets towards
   it.

Is "These standards" referring to the three former or the four latter?
GIM>> Two latter two. We've clarified that by the following update:
OLD TEXT:
   [RFC5884] and [RFC7726] set rules of using BFD
   asynchronous mode over IP/MPLS LSPs.  These standards implicitly
   assume that the egress BFD peer will use the shortest path route
   regardless of route being used to send BFD control packets towards
   it.
NEW TEXT:
[RFC5884] and [RFC7726] set rules for using BFD
   asynchronous mode over IP/MPLS LSPs, while not defining means to
   control the path an egress BFD system uses to send BFD control
   packets towards the ingress BFD system.

   For the case where a LSP is explicitly routed it is likely that the
   shortest return path to the ingress BFD peer would not follow the
   same path as the LSP in the forward direction.  The fact that BFD
   control packets are not guaranteed to follow the same links and nodes
   in both forward and reverse directions is a significant factor in
   producing false positive defect notifications, i.e. false alarms, if
   used by the ingress BFD peer to deduce the state of the forward
   direction.

There may be an implicit mis-assumption in this text and overall approach:
the
fact that traffic flows on one direction does not imply that the reverse
direction using the same interfaces and nodes would actually be consequentl=
y
properly programmed and working.
GIM>> If the objective of controlling the path from the egress to the
ingress system is to monitor such path, then detecting a defect in the
forwarding path fulfills the objective.

   This document defines the BFD Reverse Path TLV as an extension to LSP
   Ping [RFC8029] and proposes that it is to be used to instruct the
   egress BFD peer to use an explicit path for its BFD control packets
   associated with a particular BFD session.

This text assumes that the BFD return path is MPLS. However, my
understanding
from RFC 5884 is that this is not necessarily the case, and the return can
be
IP.
GIM>> The document defines an optional mechanism to control the BFD Reverse
path. The default behavior, if the BFD Reverse Path TLV is not included in
the MPLS LSP Ping with the BFD Discriminator TLV, remains, as you've noted
- over IP.

   When BFD is used to monitor unidirectional explicitly routed path,
   e.g.  MPLS-TE LSP, BFD control packets in forward direction would be
   in-band using the mechanism defined in [RFC5884] and [RFC5586].

Which BFD uses RFC 5586? RFC5586 says that is not needed:
GIM>> We've removed references to RFC 5586.

   "Some of these functions can be supported using existing
   tools such as Virtual Circuit Connectivity Verification (VCCV)
   [RFC5085], Bidirectional Forwarding Detection for MPLS LSPs (BFD-
   MPLS) [BFD-MPLS], LSP-Ping [RFC4379], or BFD-VCCV [BFD-VCCV]."

And then:

   o  a failure detection by ingress node on the reverse path cannot be
      interpreted as bi-directional failure unambiguously and thus
      trigger, for example, protection switchover of the forward
      direction without possibility of being a false positive.

   To address this scenario the egress BFD peer would be instructed to
   use a specific path for BFD control packets.

But using a specific path for return cannot either imply "interpreted as
bi-directional failure unambiguously", so the scenario is not *addressed*.

   The BFD Reverse Path TLV carries information about the path onto
   which the egress BFD peer of the BFD session referenced by the BFD
   Discriminator TLV MUST transmit BFD control packets.  The format of
   the BFD Reverse Path TLV is as presented in Figure 1.

What does the remote endpoint do with that "MUST" if the return FEC goes
away?
GIM>> The Operational Considerations section includes the following text:
   Suppose an operator planned network maintenance activity that
   possibly affects FEC used in the BFD Reverse Path TLV.  In that case,
   the operator MUST avoid the unnecessary disruption using the LSP Ping
   with a new FEC in the BFD Reverse Path TLV.  But in some scenarios,
   proactive measures cannot be taken.  Because the frequency of LSP
   Ping messages will be lower than the defect detection time provided
   by the BFD session.  As a result, a change in the reverse-path FEC
   will first be detected as the BFD session's failure.  In such a case,
   the ingress BFD node SHOULD immediately transmit the LSP Ping Echo
   request with Return Path TLV to verify whether the FEC is still
   valid.  If the failure was caused by the change in the FEC used for
   the reverse direction of the BFD session, the ingress BFD node SHOULD
   bootstrap a new BFD session using another FEC in BFD Reverse Path
   TLV.

There also seem to be some self-contradiction. This document says:

   LSP ping, defined in [RFC8029], uses BFD Discriminator TLV [RFC5884]
   to bootstrap a BFD session over an MPLS LSP.  This document defines a
   new TLV, BFD Reverse Path TLV, that MUST contain a single sub-TLV
   that can be used to carry information about the reverse path for the
   BFD session that is specified by value in BFD Discriminator TLV.

And then says:

   Reverse Path field contains a sub-TLV.

But then says:

   None, one or more sub-TLVs MAY be included in the BFD Reverse
   Path TLV.  If none sub-TLVs found in the BFD Reverse Path TLV, the
   egress BFD peer MUST revert to using the default, i.e., over IP
   network, reverse path.

So is it only one, or none/one/multiple?
GIM>> Thank you for pointing this. Below is the update in the working
version of the draft:
OLD TEXT:
   This
   document defines a new TLV, BFD Reverse Path TLV, that MUST contain a
   single sub-TLV that can be used to carry information about the
   reverse path for the BFD session that is specified by the value in
   BFD Discriminator TLV.
NEW TEXT:
   This
   document defines a new TLV, BFD Reverse Path TLV, that MAY contain
   none, one or more sub-TLVs that can be used to carry information
   about the reverse path for the BFD session that is specified by the
   value in BFD Discriminator TLV.

and one more:
OLD TEXT:
Reverse Path field contains a sub-TLV
NEW TEXT:
Reverse Path field contains none, one or more sub-TLVs.

I believe it needs to be multiple since then a Tunnel can be specified. But
the
document as-is seems self-contradicting.

Further, where has that "default" been defined as "over IP network"?
GIM>> The text was re-worked to avoid using "default":
   If no sub-TLVs are found in the BFD
   Reverse Path TLV, the egress BFD peer MUST revert to using the local
   policy based decision as described in Section 7 [RFC5884], i.e.,
   routed over IP network.

There's another contradiction here:

   If the egress LSR cannot find the path specified in the Reverse Path
   TLV it MUST send Echo Reply with the received Reverse Path TLV and
   set the Return Code to "Failed to establish the BFD session.  The
   specified reverse path was not found" Section 3.3.  The egress BFD
   peer MAY establish the BFD session over IP network as defined in
   [RFC5884].

So the response is "Failed to establish the BFD session." But then it MAY
establish the session?
GIM>> Echo Reply with the error code is to indicate that the reverse path
is not available at the egress LSR. The local policy at the egress BFD
system may command the transmission of a BFD control packet from egress to
the ingress if the Reverse Path is not available.
And, again, what if the path is found at bootstrap but
lost afterwards?
GIM>> Section 5 includes text that provides information on handling such a
scenario.

4.  Use Case Scenario

The fact that A-B-C-D-G-H works does not mean that the reverse, H-G-D-C-B-A=
,
will work.
GIM>> If the objective is to verify that the reverse path works, then
detecting a defect fulfills the task.
6.  Security Considerations

   Security considerations discussed in [RFC5880], [RFC5884], [RFC7726],
   and [RFC8029], apply to this document.

There seem to be additional security considerations with returns taking
explicit paths, and should be expanded in here.
GIM>> That scenario is discussed in the Security Considerations section in
RFC 7110. A reference to RFC 7110 was added:

   Security considerations discussed in [RFC5880], [RFC5884], [RFC7726],
   [RFC8029], and [RFC7110] apply to this document.

Net-net, I do have concerns about this document. I believe it is not ready
to
advance, and could use more whiteboard time as well as a review by BFD
experts.

Best,

Carlos Pignataro.

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<div dir=3D"ltr"><br>Dear All,<div>as we&#39;ve discussed at the MPLS WG me=
eting at IETF-108, I&#39;ve been given an action point to match updates to =
the draft-ietf-mpls-bfd-directed with the RtgDir early review comments. Ple=
ase find notes from the authors in-line under GIM&gt;&gt; and Mach&gt;&gt; =
tags.</div><div>Welcome your questions, comments.</div><div><br></div><div>=
Regards,</div><div>Greg (on behalf of the authors)</div><div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">---------- Forwarded=
 message ---------<br>From: <strong class=3D"gmail_sendername" dir=3D"auto"=
>Carlos Pignataro</strong> <span dir=3D"auto">&lt;<a href=3D"mailto:cpignat=
a@cisco.com">cpignata@cisco.com</a>&gt;</span><br>Date: Tue, Jul 11, 2017 a=
t 7:00 AM<br>Subject: Rtgdir early review of draft-ietf-mpls-bfd-directed-0=
7<br>To:  &lt;<a href=3D"mailto:rtg-dir@ietf.org">rtg-dir@ietf.org</a>&gt;<=
br>Cc:  &lt;<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>&gt;,  &lt;<a=
 href=3D"mailto:draft-ietf-mpls-bfd-directed.all@ietf.org">draft-ietf-mpls-=
bfd-directed.all@ietf.org</a>&gt;,  &lt;<a href=3D"mailto:bfd-chairs@ietf.o=
rg">bfd-chairs@ietf.org</a>&gt;<br></div><br><br>Reviewer: Carlos Pignataro=
<br>
Review result: Has Issues<br>
<br>
Hello<br>
<br>
I have been selected to do a routing directorate =E2=80=9Cearly=E2=80=9D re=
view of this draft.<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-mpls-bfd-directed/" =
rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/draft=
-ietf-mpls-bfd-directed/</a><br>
<br>
The routing directorate will, on request from the working group chair, perf=
orm<br>
an =E2=80=9Cearly=E2=80=9D review of a draft before it is submitted for pub=
lication to the<br>
IESG. The early review can be performed at any time during the draft=E2=80=
=99s lifetime<br>
as a working group document. The purpose of the early review depends on the=
<br>
stage that the document has reached.<br>
<br>
The MPLS chairs have requested an early review from the directorate with th=
e<br>
objective of improving document quality.=C2=A0 This document has had three<=
br>
unsuccessful WG LCs.<br>
<br>
For more information about the Routing Directorate, please see<br>
<a href=3D"http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir" rel=3D"nor=
eferrer" target=3D"_blank">http://trac.tools.ietf.org/area/rtg/trac/wiki/Rt=
gDir</a><br>
<br>
Document: draft-ietf-mpls-bfd-directed-07.txt<br>
Reviewer: Carlos Pignataro<br>
Review Date: Early July, 2017<br>
Intended Status: Standards Track<br>
<br>
Summary:<br>
I have significant concerns about this document.<br>
I also recommend a BFD WG Chair or appointee to review this document.<br>
<br>
Comments:<br>
<br>
First, I have a general concern about the architectural approach in this<br=
>
document.<br>
<br>
This document is modeled after RFC 7110. RFC 7110 describes the specificati=
on<br>
of a return path for MPLS LSP Ping. MPLS LSP Ping uses a request/reply<br>
command/response paradigm, in which receipt of an Echo Request elicits the<=
br>
generation of an Echo Reply.<br>
<br>
BFD for MPLS, however, uses a different approach and paradigm (as per RFC<b=
r>
5884). An MPLS LSP Ping packet is used as a bootstrap, signaling discrimina=
tor<br>
value for a persistent BFD session. After the MPLS LSP Ping signals the<br>
Discriminator (via MPLS LSP Ping TLV) to use, then BFD control messages are=
<br>
sent back and forth.<br>
<br>
However, while the BFD session is UP and=C2=A0 BFD control messages and bei=
ng sent<br>
back and forth, and while no MPLS LSP Ping packets are sent after bootstrap=
ping<br>
-- what happens if the return path changes (e.g., the return LSP goes down,=
<br>
gets unconfigured, etc.)?</div><div class=3D"gmail_quote">GIM&gt;&gt; Need =
to note that after bootstrapping a BFD session over MPLS LSP with the MPLS =
LSP Ping that includes the BFD Discriminator TLV,</div><div class=3D"gmail_=
quote">MPLS LSP Ping is periodically sent according to Section 3.2 RFC 5884=
:</div><div class=3D"gmail_quote">=C2=A0 =C2=A0Hence, BFD is used in conjun=
ction with LSP Ping for MPLS LSP fault<br>=C2=A0 =C2=A0detection:<br>
...</div><div class=3D"gmail_quote">=C2=A0 =C2=A0 iii) LSP Ping is used to =
periodically verify the control plane<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
against the data plane by ensuring that the LSP is mapped to<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0the same FEC, at the egress, as the ingress.</div><=
div class=3D"gmail_quote">[Mach] If the return LSP goes down, then the BFD =
session should go down as well, this&#39;s one of the goals that this solut=
ion is trying to achieve. For example, in some case, it want the forward an=
d reverse paths share the same route and fate.=C2=A0 The return path down n=
ormally means the forward path is down as well.</div><div class=3D"gmail_qu=
ote"><br>
In that case, not only this mechanism can actually make things worst, becau=
se<br>
it results in a false negative, but also the document does not specify how =
the<br>
system should recover.=C2=A0</div><div class=3D"gmail_quote">[Mach]=C2=A0As=
 above, this result is desired in the case that requires the forward and re=
verse path share route and fate. It should be kept down until the specified=
 return path recovered.</div><div class=3D"gmail_quote"><br></div><div clas=
s=3D"gmail_quote">The I-D seems to assume complete topological<br>
invariability for it to work long-term, since it does not specify any mecha=
nism<br>
to update or to deal with such a failure or change scenario.</div><div clas=
s=3D"gmail_quote">GIM&gt;&gt; We&#39;ve added the Operational Consideration=
s section that describes how the local BFD system using periodic MPLS LSP P=
ing can monitor the viability of the Reverse path. Particularly, the text t=
hat describes this:</div><div class=3D"gmail_quote">=C2=A0 =C2=A0If any of =
defined in<br>=C2=A0 =C2=A0[RFC7110] sub-TLVs used in BFD Reverse Path TLV,=
 then the periodic<br>=C2=A0 =C2=A0verification of the control plane agains=
t the data plane, as<br>=C2=A0 =C2=A0recommended in Section 4 [RFC5884], MU=
ST use the Return Path TLV, as<br>=C2=A0 =C2=A0per [RFC7110], with that sub=
-TLV.=C2=A0 By using the LSP Ping with Return<br>=C2=A0 =C2=A0Path TLV, an =
operator monitors whether at the egress BFD node the<br>=C2=A0 =C2=A0revers=
e LSP is mapped to the same FEC as the BFD session.=C2=A0 Selection<br>=C2=
=A0 =C2=A0and control of the rate of LSP Ping with Return Path TLV follows =
the<br>=C2=A0 =C2=A0recommendation of [RFC5884]: &quot;The rate of generati=
on of these LSP<br>=C2=A0 =C2=A0Ping Echo request messages SHOULD be signif=
icantly less than the rate<br>=C2=A0 =C2=A0of generation of the BFD Control=
 packets.=C2=A0 An implementation MAY<br>=C2=A0 =C2=A0provide configuration=
 options to control the rate of generation of<br>=C2=A0 =C2=A0the periodic =
LSP Ping Echo request messages.&quot;<br>
<br>
On the other hand, there is already a BFD mechanism without the bootstrappi=
ng<br>
setup and with a command/response like behavior, that is S-BFD, RFC 7881. T=
hat<br>
one is notably missing from this draft.</div><div class=3D"gmail_quote">GIM=
&gt;&gt; The goal of the proposed mechanism is not to avoid bootstrapping a=
 BFD over MPLS LSP session or simulate Echo Response/Reply behavior but to =
control the path the remote BFD system uses to transmit BFD control packets=
 in BFD Asynchronous mode.</div><div class=3D"gmail_quote">[Mach] The purpo=
se of this draft is to specify a particular return path, S-BFD cannot speci=
fy the return path, thus cannot satisfy the requirement.<br>
<br>
Further, there seem to be a number of potentially erroneous assumptions mad=
e,<br>
see below.<br>
<br>
Additional Comments:<br>
<br>
=C2=A0 =C2=A0 =C2=A0Bidirectional Forwarding Detection (BFD) Directed Retur=
n Path<br>
<br>
The title should include that this is *only* for MPLS BFD.</div><div class=
=3D"gmail_quote">GIM&gt;&gt; Thank you for the helpful editorial suggestion=
.<br>
<br>
=C2=A0 =C2=A0When a BFD session monitors an explicitly routed unidirectiona=
l path<br>
=C2=A0 =C2=A0there may be a need to direct egress BFD peer to use a specifi=
c path<br>
=C2=A0 =C2=A0for the reverse direction of the BFD session.<br>
<br>
Scope: is this solution targeted only for &quot;explicitly routed unidirect=
ional<br>
path&quot;, and the solution to have the reply come back the exact reverse<=
br>
direction? That does not seem to be the case and the solution.</div><div cl=
ass=3D"gmail_quote">GIM&gt;&gt; The path from the remote BFD system may tra=
verse the same nodes and links traversed by the BFD control packets transmi=
tted from the ingress LER, i.e., be co-routed. But the proposed mechanism i=
s more generic and allows an operator to control the path traversed by a BF=
D control packet transmitted by the egress LER.<br>
<br>
=C2=A0 =C2=A0[RFC5880], [RFC5881], and [RFC5883] established the BFD protoc=
ol for<br>
=C2=A0 =C2=A0IP networks.=C2=A0 [RFC5884] and [RFC7726] set rules of using =
BFD<br>
=C2=A0 =C2=A0asynchronous mode over IP/MPLS LSPs.=C2=A0 These standards imp=
licitly<br>
=C2=A0 =C2=A0assume that the egress BFD peer will use the shortest path rou=
te<br>
=C2=A0 =C2=A0regardless of route being used to send BFD control packets tow=
ards<br>
=C2=A0 =C2=A0it.<br>
<br>
Is &quot;These standards&quot; referring to the three former or the four la=
tter?</div><div class=3D"gmail_quote">GIM&gt;&gt; Two latter two. We&#39;ve=
 clarified that by the following update:</div><div class=3D"gmail_quote">OL=
D TEXT:</div><div class=3D"gmail_quote">=C2=A0 =C2=A0[RFC5884] and [RFC7726=
] set rules of using BFD<br>
=C2=A0 =C2=A0asynchronous mode over IP/MPLS LSPs.=C2=A0 These standards imp=
licitly<br>
=C2=A0 =C2=A0assume that the egress BFD peer will use the shortest path rou=
te<br>
=C2=A0 =C2=A0regardless of route being used to send BFD control packets tow=
ards<br>
=C2=A0 =C2=A0it.=C2=A0</div><div class=3D"gmail_quote">NEW TEXT:</div>[RFC5=
884] and [RFC7726] set rules for using BFD<br>=C2=A0 =C2=A0asynchronous mod=
e over IP/MPLS LSPs, while not defining means to<br>=C2=A0 =C2=A0control th=
e path an egress BFD system uses to send BFD control<br><div class=3D"gmail=
_quote">=C2=A0 =C2=A0packets towards the ingress BFD system.=C2=A0<br>
<br>
=C2=A0 =C2=A0For the case where a LSP is explicitly routed it is likely tha=
t the<br>
=C2=A0 =C2=A0shortest return path to the ingress BFD peer would not follow =
the<br>
=C2=A0 =C2=A0same path as the LSP in the forward direction.=C2=A0 The fact =
that BFD<br>
=C2=A0 =C2=A0control packets are not guaranteed to follow the same links an=
d nodes<br>
=C2=A0 =C2=A0in both forward and reverse directions is a significant factor=
 in<br>
=C2=A0 =C2=A0producing false positive defect notifications, i.e. false alar=
ms, if<br>
=C2=A0 =C2=A0used by the ingress BFD peer to deduce the state of the forwar=
d<br>
=C2=A0 =C2=A0direction.<br>
<br>
There may be an implicit mis-assumption in this text and overall approach: =
the<br>
fact that traffic flows on one direction does not imply that the reverse<br=
>
direction using the same interfaces and nodes would actually be consequentl=
y<br>
properly programmed and working.</div><div class=3D"gmail_quote">GIM&gt;&gt=
; If the objective of controlling the path from the egress to the ingress s=
ystem is to monitor such path, then detecting a defect in the forwarding pa=
th fulfills the objective.<br>
<br>
=C2=A0 =C2=A0This document defines the BFD Reverse Path TLV as an extension=
 to LSP<br>
=C2=A0 =C2=A0Ping [RFC8029] and proposes that it is to be used to instruct =
the<br>
=C2=A0 =C2=A0egress BFD peer to use an explicit path for its BFD control pa=
ckets<br>
=C2=A0 =C2=A0associated with a particular BFD session.<br>
<br>
This text assumes that the BFD return path is MPLS. However, my understandi=
ng<br>
from RFC 5884 is that this is not necessarily the case, and the return can =
be<br>
IP.</div><div class=3D"gmail_quote">GIM&gt;&gt; The document defines an opt=
ional mechanism to control the BFD Reverse path. The default behavior, if t=
he BFD Reverse Path TLV is not included in the MPLS LSP Ping with the BFD D=
iscriminator TLV, remains, as you&#39;ve noted - over IP.<br>
<br>
=C2=A0 =C2=A0When BFD is used to monitor unidirectional explicitly routed p=
ath,<br>
=C2=A0 =C2=A0e.g.=C2=A0 MPLS-TE LSP, BFD control packets in forward directi=
on would be<br>
=C2=A0 =C2=A0in-band using the mechanism defined in [RFC5884] and [RFC5586]=
.<br>
<br>
Which BFD uses RFC 5586? RFC5586 says that is not needed:</div><div class=
=3D"gmail_quote">GIM&gt;&gt; We&#39;ve removed references to RFC 5586.<br>
<br>
=C2=A0 =C2=A0&quot;Some of these functions can be supported using existing<=
br>
=C2=A0 =C2=A0tools such as Virtual Circuit Connectivity Verification (VCCV)=
<br>
=C2=A0 =C2=A0[RFC5085], Bidirectional Forwarding Detection for MPLS LSPs (B=
FD-<br>
=C2=A0 =C2=A0MPLS) [BFD-MPLS], LSP-Ping [RFC4379], or BFD-VCCV [BFD-VCCV].&=
quot;<br>
<br>
And then:<br>
<br>
=C2=A0 =C2=A0o=C2=A0 a failure detection by ingress node on the reverse pat=
h cannot be<br>
=C2=A0 =C2=A0 =C2=A0 interpreted as bi-directional failure unambiguously an=
d thus<br>
=C2=A0 =C2=A0 =C2=A0 trigger, for example, protection switchover of the for=
ward<br>
=C2=A0 =C2=A0 =C2=A0 direction without possibility of being a false positiv=
e.<br>
<br>
=C2=A0 =C2=A0To address this scenario the egress BFD peer would be instruct=
ed to<br>
=C2=A0 =C2=A0use a specific path for BFD control packets.<br>
<br>
But using a specific path for return cannot either imply &quot;interpreted =
as<br>
bi-directional failure unambiguously&quot;, so the scenario is not *address=
ed*.<br>
<br>
=C2=A0 =C2=A0The BFD Reverse Path TLV carries information about the path on=
to<br>
=C2=A0 =C2=A0which the egress BFD peer of the BFD session referenced by the=
 BFD<br>
=C2=A0 =C2=A0Discriminator TLV MUST transmit BFD control packets.=C2=A0 The=
 format of<br>
=C2=A0 =C2=A0the BFD Reverse Path TLV is as presented in Figure 1.<br>
<br>
What does the remote endpoint do with that &quot;MUST&quot; if the return F=
EC goes away?</div><div class=3D"gmail_quote">GIM&gt;&gt; The Operational C=
onsiderations section includes the following text:</div><div class=3D"gmail=
_quote">=C2=A0 =C2=A0Suppose an operator planned network maintenance activi=
ty that<br>=C2=A0 =C2=A0possibly affects FEC used in the BFD Reverse Path T=
LV.=C2=A0 In that case,<br>=C2=A0 =C2=A0the operator MUST avoid the unneces=
sary disruption using the LSP Ping<br>=C2=A0 =C2=A0with a new FEC in the BF=
D Reverse Path TLV.=C2=A0 But in some scenarios,<br>=C2=A0 =C2=A0proactive =
measures cannot be taken.=C2=A0 Because the frequency of LSP<br>=C2=A0 =C2=
=A0Ping messages will be lower than the defect detection time provided<br>=
=C2=A0 =C2=A0by the BFD session.=C2=A0 As a result, a change in the reverse=
-path FEC<br>=C2=A0 =C2=A0will first be detected as the BFD session&#39;s f=
ailure.=C2=A0 In such a case,<br>=C2=A0 =C2=A0the ingress BFD node SHOULD i=
mmediately transmit the LSP Ping Echo<br>=C2=A0 =C2=A0request with Return P=
ath TLV to verify whether the FEC is still<br>=C2=A0 =C2=A0valid.=C2=A0 If =
the failure was caused by the change in the FEC used for<br>=C2=A0 =C2=A0th=
e reverse direction of the BFD session, the ingress BFD node SHOULD<br>=C2=
=A0 =C2=A0bootstrap a new BFD session using another FEC in BFD Reverse Path=
<br>=C2=A0 =C2=A0TLV.<br>
<br>
There also seem to be some self-contradiction. This document says:<br>
<br>
=C2=A0 =C2=A0LSP ping, defined in [RFC8029], uses BFD Discriminator TLV [RF=
C5884]<br>
=C2=A0 =C2=A0to bootstrap a BFD session over an MPLS LSP.=C2=A0 This docume=
nt defines a<br>
=C2=A0 =C2=A0new TLV, BFD Reverse Path TLV, that MUST contain a single sub-=
TLV<br>
=C2=A0 =C2=A0that can be used to carry information about the reverse path f=
or the<br>
=C2=A0 =C2=A0BFD session that is specified by value in BFD Discriminator TL=
V.<br>
<br>
And then says:<br>
<br>
=C2=A0 =C2=A0Reverse Path field contains a sub-TLV.<br>
<br>
But then says:<br>
<br>
=C2=A0 =C2=A0None, one or more sub-TLVs MAY be included in the BFD Reverse<=
br>
=C2=A0 =C2=A0Path TLV.=C2=A0 If none sub-TLVs found in the BFD Reverse Path=
 TLV, the<br>
=C2=A0 =C2=A0egress BFD peer MUST revert to using the default, i.e., over I=
P<br>
=C2=A0 =C2=A0network, reverse path.<br>
<br>
So is it only one, or none/one/multiple?</div><div class=3D"gmail_quote">GI=
M&gt;&gt; Thank you for pointing this. Below is the update in the working v=
ersion of the draft:</div><div class=3D"gmail_quote">OLD TEXT:</div><div cl=
ass=3D"gmail_quote">=C2=A0 =C2=A0This<br>=C2=A0 =C2=A0document defines a ne=
w TLV, BFD Reverse Path TLV, that MUST contain a<br>=C2=A0 =C2=A0single sub=
-TLV that can be used to carry information about the<br>=C2=A0 =C2=A0revers=
e path for the BFD session that is specified by the value in<br>=C2=A0 =C2=
=A0BFD Discriminator TLV.</div><div class=3D"gmail_quote">NEW TEXT:</div><d=
iv class=3D"gmail_quote">=C2=A0 =C2=A0This<br>=C2=A0 =C2=A0document defines=
 a new TLV, BFD Reverse Path TLV, that MAY contain<br>=C2=A0 =C2=A0none, on=
e or more sub-TLVs that can be used to carry information<br>=C2=A0 =C2=A0ab=
out the reverse path for the BFD session that is specified by the<br>=C2=A0=
 =C2=A0value in BFD Discriminator TLV.</div><div class=3D"gmail_quote"><br>=
</div><div class=3D"gmail_quote">and one more:</div><div class=3D"gmail_quo=
te">OLD TEXT:</div><div class=3D"gmail_quote">Reverse Path field contains a=
 sub-TLV</div><div class=3D"gmail_quote">NEW TEXT:</div><div class=3D"gmail=
_quote">Reverse Path field contains none, one or more sub-TLVs.<br>
<br>
I believe it needs to be multiple since then a Tunnel can be specified. But=
 the<br>
document as-is seems self-contradicting.<br>
<br>
Further, where has that &quot;default&quot; been defined as &quot;over IP n=
etwork&quot;?</div><div class=3D"gmail_quote">GIM&gt;&gt; The text was re-w=
orked to avoid using &quot;default&quot;:</div><div class=3D"gmail_quote">=
=C2=A0 =C2=A0If no sub-TLVs are found in the BFD<br>=C2=A0 =C2=A0Reverse Pa=
th TLV, the egress BFD peer MUST revert to using the local<br>=C2=A0 =C2=A0=
policy based decision as described in Section 7 [RFC5884], i.e.,<br>=C2=A0 =
=C2=A0routed over IP network.<br>
<br>
There&#39;s another contradiction here:<br>
<br>
=C2=A0 =C2=A0If the egress LSR cannot find the path specified in the Revers=
e Path<br>
=C2=A0 =C2=A0TLV it MUST send Echo Reply with the received Reverse Path TLV=
 and<br>
=C2=A0 =C2=A0set the Return Code to &quot;Failed to establish the BFD sessi=
on.=C2=A0 The<br>
=C2=A0 =C2=A0specified reverse path was not found&quot; Section 3.3.=C2=A0 =
The egress BFD<br>
=C2=A0 =C2=A0peer MAY establish the BFD session over IP network as defined =
in<br>
=C2=A0 =C2=A0[RFC5884].<br>
<br>
So the response is &quot;Failed to establish the BFD session.&quot; But the=
n it MAY<br>
establish the session?=C2=A0</div><div class=3D"gmail_quote">GIM&gt;&gt; Ec=
ho Reply with the error code is to indicate that the reverse path is not av=
ailable at the egress LSR. The local policy at the egress BFD system may co=
mmand the transmission of a BFD control packet from egress to the ingress i=
f the Reverse Path is not available.</div><div class=3D"gmail_quote">And, a=
gain, what if the path is found at bootstrap but<br>
lost afterwards?</div><div class=3D"gmail_quote">GIM&gt;&gt; Section 5 incl=
udes text that provides information on handling such a scenario.<br>
<br>
4.=C2=A0 Use Case Scenario<br>
<br>
The fact that A-B-C-D-G-H works does not mean that the reverse, H-G-D-C-B-A=
,<br>
will work.<br>
GIM&gt;&gt; If the objective is to verify that the reverse path works, then=
 detecting a defect fulfills the task.<br>
6.=C2=A0 Security Considerations<br>
<br>
=C2=A0 =C2=A0Security considerations discussed in [RFC5880], [RFC5884], [RF=
C7726],<br>
=C2=A0 =C2=A0and [RFC8029], apply to this document.<br>
<br>
There seem to be additional security considerations with returns taking<br>
explicit paths, and should be expanded in here.</div><div class=3D"gmail_qu=
ote">GIM&gt;&gt; That scenario is discussed in the Security Considerations =
section in RFC 7110. A reference to RFC 7110 was added:</div><div class=3D"=
gmail_quote"><br></div><div class=3D"gmail_quote">=C2=A0 =C2=A0Security con=
siderations discussed in [RFC5880], [RFC5884], [RFC7726],<br>=C2=A0 =C2=A0[=
RFC8029], and [RFC7110] apply to this document.<br>
<br>
Net-net, I do have concerns about this document. I believe it is not ready =
to<br>
advance, and could use more whiteboard time as well as a review by BFD expe=
rts.<br>
<br>
Best,<br>
<br>
Carlos Pignataro.<br>
<br>
</div></div></div>

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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Greg Mirsky <gregimirsky@gmail.com>
CC: mpls <mpls@ietf.org>, MPLS Working Group <mpls-chairs@ietf.org>, "Routing Directorate" <rtg-dir@ietf.org>, "draft-ietf-mpls-bfd-directed@ietf.org" <draft-ietf-mpls-bfd-directed@ietf.org>
Thread-Topic: Rtgdir early review of draft-ietf-mpls-bfd-directed-07
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Date: Wed, 5 Aug 2020 02:39:48 +0000
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Subject: Re: [RTG-DIR] Rtgdir early review of draft-ietf-mpls-bfd-directed-07
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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Thu, 6 Aug 2020 13:51:35 +0100
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Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10
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> ---
>=20
> It would be nice to avoid the term "man-in-the-middle" (and coresponding
> "MITM") in favour of the term "on-path attacker". It is less problematic
> as a term, and no less accurate.
>=20
> Although "man-in-the-middle" is well established, I think you could
> easily avoid it and if you feel necessary you could use "An on-path
> attacker (formerly known as a man-in-the-middle) ..."

I sort of understand why you want to change MITM, although given that the ma=
n you have in mind is evil I am not sure whether it is that objectionable in=
 this context. However I am not sure on-path is the right term. MITM normall=
y implies an entity that can modify traffic in flight, whereas an on path at=
tacker may simply be an observer.

Maybe AITM (attacker ....) would be a better gender neutral term.

Stewart



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From: Eric Gray <eric.gray@ericsson.com>
To: Stewart Bryant <stewart.bryant@gmail.com>, Adrian Farrel <adrian@olddog.co.uk>
CC: "draft-ietf-detnet-security.all@ietf.org" <draft-ietf-detnet-security.all@ietf.org>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "detnet@ietf.org" <detnet@ietf.org>
Thread-Topic: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10
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Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10
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Stewart,

	Actually, in addition to the many things that are strange about this entir=
e conversation, your observation about the "thing in the middle" (I mean, l=
et's face it, the "entity" in the middle - EITM? - has been gender-neutral =
for a long time, given that any human participation in the role could be de=
tected by an idiot) being necessarily _active_ is not quite correct.

	It seems to me to be quite reasonable that the middle position could as ea=
sily be used to passively collect information for use in other activities -=
 including a few fairly well known attacks.

--
Eric

-----Original Message-----
From: rtg-dir <rtg-dir-bounces@ietf.org> On Behalf Of Stewart Bryant
Sent: Thursday, August 6, 2020 8:52 AM
To: Adrian Farrel <adrian@olddog.co.uk>
Cc: draft-ietf-detnet-security.all@ietf.org; rtg-dir@ietf.org; detnet@ietf.=
org
Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detne=
t-security-10


> ---
>=20
> It would be nice to avoid the term "man-in-the-middle" (and=20
> coresponding
> "MITM") in favour of the term "on-path attacker". It is less=20
> problematic as a term, and no less accurate.
>=20
> Although "man-in-the-middle" is well established, I think you could=20
> easily avoid it and if you feel necessary you could use "An on-path=20
> attacker (formerly known as a man-in-the-middle) ..."

I sort of understand why you want to change MITM, although given that the m=
an you have in mind is evil I am not sure whether it is that objectionable =
in this context. However I am not sure on-path is the right term. MITM norm=
ally implies an entity that can modify traffic in flight, whereas an on pat=
h attacker may simply be an observer.

Maybe AITM (attacker ....) would be a better gender neutral term.

Stewart



From nobody Thu Aug  6 10:12:57 2020
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Date: Thu, 6 Aug 2020 18:12:46 +0100
Cc: Stewart Bryant <stewart.bryant@gmail.com>, Adrian Farrel <adrian@olddog.co.uk>, "draft-ietf-detnet-security.all@ietf.org" <draft-ietf-detnet-security.all@ietf.org>,  "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "detnet@ietf.org" <detnet@ietf.org>
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Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10
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We are talking about the threats in DN.=20

I think we should be focusing on the things that are special to DN which =
is a technology that adds certain properties to a general network. I =
assume the protection of the general network using the normal techniques =
is a given.

Passively looking at the contents is about privacy and technical =
surveillance to intervene more effectively.

Privacy obviously applies to a general network, and I take it as read =
that we protect against this. However this document is about DN, and I =
cannot see what the privacy concerns are about the DN specifics.

- Stewart



> On 6 Aug 2020, at 14:05, Eric Gray <eric.gray@ericsson.com> wrote:
>=20
> Stewart,
>=20
> 	Actually, in addition to the many things that are strange about =
this entire conversation, your observation about the "thing in the =
middle" (I mean, let's face it, the "entity" in the middle - EITM? - has =
been gender-neutral for a long time, given that any human participation =
in the role could be detected by an idiot) being necessarily _active_ is =
not quite correct.
>=20
> 	It seems to me to be quite reasonable that the middle position =
could as easily be used to passively collect information for use in =
other activities - including a few fairly well known attacks.
>=20
> --
> Eric
>=20
> -----Original Message-----
> From: rtg-dir <rtg-dir-bounces@ietf.org> On Behalf Of Stewart Bryant
> Sent: Thursday, August 6, 2020 8:52 AM
> To: Adrian Farrel <adrian@olddog.co.uk>
> Cc: draft-ietf-detnet-security.all@ietf.org; rtg-dir@ietf.org; =
detnet@ietf.org
> Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of =
draft-ietf-detnet-security-10
>=20
>=20
>> ---
>>=20
>> It would be nice to avoid the term "man-in-the-middle" (and=20
>> coresponding
>> "MITM") in favour of the term "on-path attacker". It is less=20
>> problematic as a term, and no less accurate.
>>=20
>> Although "man-in-the-middle" is well established, I think you could=20=

>> easily avoid it and if you feel necessary you could use "An on-path=20=

>> attacker (formerly known as a man-in-the-middle) ..."
>=20
> I sort of understand why you want to change MITM, although given that =
the man you have in mind is evil I am not sure whether it is that =
objectionable in this context. However I am not sure on-path is the =
right term. MITM normally implies an entity that can modify traffic in =
flight, whereas an on path attacker may simply be an observer.
>=20
> Maybe AITM (attacker ....) would be a better gender neutral term.
>=20
> Stewart
>=20
>=20


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From: Eric Gray <eric.gray@ericsson.com>
To: Stewart Bryant <stewart.bryant@gmail.com>
CC: Adrian Farrel <adrian@olddog.co.uk>, "draft-ietf-detnet-security.all@ietf.org" <draft-ietf-detnet-security.all@ietf.org>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "detnet@ietf.org" <detnet@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/1vTW_DPhzc52O_-W48-pNP61M_w>
Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10
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Stewart,

	I am going to assume that you mean "DetNet" when you refer to "DN" (maybe =
I'm wrong?).

	I am not certain that your "active attacker" assumption is correct even in=
 this limited case, but you were responding on the subject of "gender neutr=
ality" and whether or not it is appropriate to use "MITM" (presumably in ge=
neral).

	That topic is no longer in the realm of "DetNet specific."  So your respon=
se should probably not be written (or read) as if it were.

	In your own words, however, one reason for passive listening is "technical=
 surveillance to intervene more effectively" - which would seem to apply to=
 DetNet at least as much as to anything else.

	This is not necessarily a generic privacy concern, as a passive MITM could=
 be waiting for some specific activity (or activities) to occur in what wou=
ld clearly be a "special class" of communications (such as DetNet would be)=
.

	As I implied in a separate discussion, a MITM active attacker is rather ea=
sy to detect and deal with - unless it targets a specific subset of users o=
r applications in unpredictable ways.  If it remains passive, the only way =
to detect it is from information leakage that would otherwise be unexplaina=
ble.

	If a malicious actor has other ways to perpetrate an attack, a passive MIT=
M could be used to select targets, or select timing, and otherwise remain u=
ndetected over a long period of time.

	Presumably, DetNet traffic is self-announced "important" traffic.  If this=
 does not increase its vulnerability to active or passive MITM hazards, the=
n it would be good to be assured of that.

--
Eric

--
Eric

-----Original Message-----
From: Stewart Bryant <stewart.bryant@gmail.com>=20
Sent: Thursday, August 6, 2020 1:13 PM
To: Eric Gray <eric.gray@ericsson.com>
Cc: Stewart Bryant <stewart.bryant@gmail.com>; Adrian Farrel <adrian@olddog=
.co.uk>; draft-ietf-detnet-security.all@ietf.org; rtg-dir@ietf.org; detnet@=
ietf.org
Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detne=
t-security-10
Importance: High

We are talking about the threats in DN.=20

I think we should be focusing on the things that are special to DN which is=
 a technology that adds certain properties to a general network. I assume t=
he protection of the general network using the normal techniques is a given=
.

Passively looking at the contents is about privacy and technical surveillan=
ce to intervene more effectively.

Privacy obviously applies to a general network, and I take it as read that =
we protect against this. However this document is about DN, and I cannot se=
e what the privacy concerns are about the DN specifics.

- Stewart



> On 6 Aug 2020, at 14:05, Eric Gray <eric.gray@ericsson.com> wrote:
>=20
> Stewart,
>=20
> 	Actually, in addition to the many things that are strange about this ent=
ire conversation, your observation about the "thing in the middle" (I mean,=
 let's face it, the "entity" in the middle - EITM? - has been gender-neutra=
l for a long time, given that any human participation in the role could be =
detected by an idiot) being necessarily _active_ is not quite correct.
>=20
> 	It seems to me to be quite reasonable that the middle position could as =
easily be used to passively collect information for use in other activities=
 - including a few fairly well known attacks.
>=20
> --
> Eric
>=20
> -----Original Message-----
> From: rtg-dir <rtg-dir-bounces@ietf.org> On Behalf Of Stewart Bryant
> Sent: Thursday, August 6, 2020 8:52 AM
> To: Adrian Farrel <adrian@olddog.co.uk>
> Cc: draft-ietf-detnet-security.all@ietf.org; rtg-dir@ietf.org;=20
> detnet@ietf.org
> Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of=20
> draft-ietf-detnet-security-10
>=20
>=20
>> ---
>>=20
>> It would be nice to avoid the term "man-in-the-middle" (and=20
>> coresponding
>> "MITM") in favour of the term "on-path attacker". It is less=20
>> problematic as a term, and no less accurate.
>>=20
>> Although "man-in-the-middle" is well established, I think you could=20
>> easily avoid it and if you feel necessary you could use "An on-path=20
>> attacker (formerly known as a man-in-the-middle) ..."
>=20
> I sort of understand why you want to change MITM, although given that the=
 man you have in mind is evil I am not sure whether it is that objectionabl=
e in this context. However I am not sure on-path is the right term. MITM no=
rmally implies an entity that can modify traffic in flight, whereas an on p=
ath attacker may simply be an observer.
>=20
> Maybe AITM (attacker ....) would be a better gender neutral term.
>=20
> Stewart
>=20
>=20


From nobody Fri Aug  7 01:12:05 2020
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Thread-Topic: Rtgdir last call review of draft-ietf-teas-pce-native-ip
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Subject: [RTG-DIR] Rtgdir last call review of draft-ietf-teas-pce-native-ip
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Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10
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I can't decide whether to get into this or not =F0=9F=98=8A

My review said, "It would be nice to avoid," not, "You must avoid."
The review is principally for the AD, and they will tell you whether you =
need to action this.
I made a constructive suggestion of an alternative phrase, but you are =
allowed to choose others.

The thing about the term "man-in-the-middle" is not that it is directly =
making a specific man appear evil, it is that it associates the word =
"man" with the concept "evil" and therefore subtly changes the long-term =
perception of "man". There is, in fact, nothing about this type of =
attack that is specific to a man, and not all attackers are men, nor are =
all men attackers.

This is a minor issue for me, and (to some extent) I wanted to =
experiment with draft-knodel-terminology to see what reaction it would =
get if the changes it suggests were made as a request rather than as an =
order.

Cheers,
Adrian

-----Original Message-----
From: Stewart Bryant <stewart.bryant@gmail.com>=20
Sent: 06 August 2020 13:52
To: Adrian Farrel <adrian@olddog.co.uk>
Cc: rtg-dir@ietf.org; draft-ietf-detnet-security.all@ietf.org; =
detnet@ietf.org
Subject: Re: [Detnet] Rtgdir last call review of =
draft-ietf-detnet-security-10


> ---
>=20
> It would be nice to avoid the term "man-in-the-middle" (and =
coresponding
> "MITM") in favour of the term "on-path attacker". It is less =
problematic
> as a term, and no less accurate.
>=20
> Although "man-in-the-middle" is well established, I think you could
> easily avoid it and if you feel necessary you could use "An on-path
> attacker (formerly known as a man-in-the-middle) ..."

I sort of understand why you want to change MITM, although given that =
the man you have in mind is evil I am not sure whether it is that =
objectionable in this context. However I am not sure on-path is the =
right term. MITM normally implies an entity that can modify traffic in =
flight, whereas an on path attacker may simply be an observer.

Maybe AITM (attacker ....) would be a better gender neutral term.

Stewart



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Subject: [RTG-DIR] Rtg-Dir Last Call review of draft-ietf-mpls-spl-terminology-02.txt
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Hello,=20
I have been selected as the Routing Directorate reviewer for this draft. Th=
e Routing Directorate seeks to review all routing or routing-related drafts=
 as they pass through IETF last call and IESG review, and sometimes on spec=
ial request. The purpose of the review is to provide assistance to the Rout=
ing ADs. For more information about the Routing Directorate, please see htt=
p://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir=20

Although these comments are primarily for the use of the Routing ADs, it wo=
uld be helpful if you could consider them along with any other IETF Last Ca=
ll comments that you receive, and strive to resolve them through discussion=
 or by updating the draft.=20

Document: draft-ietf-mpls-spl-terminology-02.txt
Reviewer: Eric Gray
Review Date: 10 August, 2020
IETF LC End Date: 11 August, 2020
Intended Status: Informational

Summary:
This document is basically ready for publication, but has potential minor i=
ssues and nits that should be considered prior to publication.

Major Issues:
None

Minor Issues:
Possibly omitted reference in the introduction (see Nits below)?

Possible ambiguity about which registry is referred to in the latter part o=
f section 2.1 (see Nits below)?

Nits:

In the 1st line of the 2nd paragraph of the Introduction, the word "use" ap=
pears twice in a row.

In the 4th paragraph of the introduction, RFC 3032 is separately listed twi=
ce (i.e. - with the name "RFC 3032", and the link to the reference in each =
case, it is actually listed 4 times).

Note: I am not sure, but this may be more than a Nit - if, for instance, th=
e intention was to list a different RFC.  The paragraph claims the draft up=
dates RFC 7274 and RFC 3032 - but RFC 7274 claims to update RFC 3038, RFC 3=
209, RFC 3811, RFC 4182, RFC 4928, RFC 5331, RFC 5586, RFC 5921, RFC 5960, =
RFC 6391, RFC 6478, and RFC 6790 as well. =20

Possibly one of these other RFCs was also meant to be included?  This does =
not seem very likely, however, because only RFC 3032 and RFC 7274 are liste=
d as updated on the cover page.

I assume only one "registry" is referred to in the last sentence of section=
 2.1 (and - in fact - in the entirety of section 2.1).  In earlier sentence=
s, the registry is explicitly named, or referred to as "that registry."  In=
 the final sentence, there are two references to a registry - one of which =
refers to "the registry" and the other to "that registry."

As a Nit, I suggest using "that registry" consistently - unless a different=
 registry is actually referred to.

In the 4th bullet in section 3, "an bSPL" should probably be "a bSPL."

In the Security Considerations section, 1st paragraph - "establsihed" --> "=
established" and "doucment" --> "document."
2nd paragraph - "the potential" --> "potential" (awkward using a definite a=
rticle with a possibility).

--
Eric


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Subject: Re: [RTG-DIR] [mpls] Rtg-Dir Last Call review of draft-ietf-mpls-spl-terminology-02.txt
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Eric,

Tnx for comments, very useful.

I will await instructions from Deborah and the post an updated version.
Most of your are straightforward and will be updated as you  suggest.

Two small comments below.

On 11/08/2020 00:53, Eric Gray wrote:

The duplication of RFC 3202 is a typo.

As what update what in:
> Note: I am not sure, but this may be more than a Nit - if, for instance, the intention was to list a different RFC.  The paragraph claims the draft updates RFC 7274 and RFC 3032 - but RFC 7274 claims to update RFC 3038, RFC 3209, RFC 3811, RFC 4182, RFC 4928, RFC 5331, RFC 5586, RFC 5921, RFC 5960, RFC 6391, RFC 6478, and RFC 6790 as well.

What RFC 7274 does to the listed RFCs is to rename them from "Resereved
Labels" to "Special Purpose Labels"

The terminology draft aligns with this. First bullet in in Section 3
says:


    o  Collectively, the two ranges are known as Special Purpose Labels
       (SPL).

The changes in this draft and RFC 7274 are not overlapping.

/Loa

-- 

Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert                          loa.pi.nu@gmail.com
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Tue Aug 11 06:46:43 2020
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Subject: Re: [RTG-DIR] [mpls] Rtg-Dir Last Call review of draft-ietf-mpls-spl-terminology-02.txt
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So I understand Eric's point about updates of updates.

We're updating 7274, and 7274 updated <insert long list here>, so surely =
we are updating <long list> as well.

What Loa says is that we are not updating the bit of 7274 that updated =
<long list>. He's right about that, but it is maybe not such a strong =
point. After all, someone directed from <member of list> to read 7274 =
might miss the wider material.

But I think that historically (Deborah to confirm) "updates" is only =
used for direct updating. That is, the reader is expected to walk =
through the chain of documents by finding "<member of list> is updated =
by 7274" and also finding "7274 is updated by [This.I-D]".

(This might all be different if we were obsoleting 7274, but we're not =
=F0=9F=98=8A)

A
-----Original Message-----
From: Loa Andersson <loa@pi.nu>=20
Sent: 11 August 2020 11:41
To: Eric Gray <eric.gray=3D40ericsson.com@dmarc.ietf.org>; =
rtg-ads@ietf.org
Cc: rtg-dir@ietf.org; draft-ietf-mpls-spl-terminology.all@ietf.org; =
mpls@ietf.org
Subject: Re: [mpls] Rtg-Dir Last Call review of =
draft-ietf-mpls-spl-terminology-02.txt

Eric,

Tnx for comments, very useful.

I will await instructions from Deborah and the post an updated version.
Most of your are straightforward and will be updated as you  suggest.

Two small comments below.

On 11/08/2020 00:53, Eric Gray wrote:

The duplication of RFC 3202 is a typo.

As what update what in:
> Note: I am not sure, but this may be more than a Nit - if, for =
instance, the intention was to list a different RFC.  The paragraph =
claims the draft updates RFC 7274 and RFC 3032 - but RFC 7274 claims to =
update RFC 3038, RFC 3209, RFC 3811, RFC 4182, RFC 4928, RFC 5331, RFC =
5586, RFC 5921, RFC 5960, RFC 6391, RFC 6478, and RFC 6790 as well.

What RFC 7274 does to the listed RFCs is to rename them from "Resereved
Labels" to "Special Purpose Labels"

The terminology draft aligns with this. First bullet in in Section 3
says:


    o  Collectively, the two ranges are known as Special Purpose Labels
       (SPL).

The changes in this draft and RFC 7274 are not overlapping.

/Loa

--=20

Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert                          loa.pi.nu@gmail.com
Bronze Dragon Consulting             phone: +46 739 81 21 64


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Subject: Re: [RTG-DIR] RtgDir Early review: draft-ietf-bess-datacenter-gateway.txt
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Hi Ravi,

=20

I=E2=80=99m doing housekeeping on this draft and find your review. It =
looks like we didn=E2=80=99t respond =E2=80=93 sorry.

=20

Many thanks for the careful review.=20

=20

Comments are in line=E2=80=A6

=20

Intended Status: Standards track (but is it the right one? Should this =
be informational instead, since no new encodings are explicitly =
specified)





Summary:

=20

I have some minor concerns about this document that I think should be =
resolved before it is submitted to the IESG.

=20

Comments:

1. Draft track: does this need to be "standards track=E2=80=9D? No new =
encodings are specified, even though there are requests for new IANA =
code-points.

=20

AF> The document asks for a code point from the =E2=80=9CBGP Tunnel =
Encapsulation Attribute Sub-TLVs" registry for which the registration =
policy for this registry is Standards Action. So we have to be a =
Standards Track document.

=20

2. Section 3:

          a. Auto-discovery: setting the route-target to SR-ID: how to =
avoid conflicts in regards to route-target settings: some may represent =
the SR ID and other represent non-SR constructs? Some text in that =
regard would be helpful.

=20

AF> These are not VPN routes so there shouldn=E2=80=99t be any conflict. =
But I think your question might be about what happens if other RTs need =
to be present on the same advertisement. And the answer is, =
=E2=80=9Cjust do it=E2=80=9D.

=20

          b. The draft would do well to explicitly state what happens if =
the GWs in a given domain end up getting configured with different SR =
IDs.

=20

AF> We will add a little text.  Basically they would not auto-discover =
each other and a receiver would just get the best route with only the =
advertising node=E2=80=99s tunnel encapsulation information.

=20

          c. Is there a specific reason why neither the format for the =
SR tunnel TLV is listed nor a pointer given to a pre-existing definition =
in another doc?

=20

AF> We will add a reference to  =
<https://datatracker.ietf.org/doc/html/draft-ietf-idr-tunnel-encaps-15#se=
ction-2> =
https://datatracker.ietf.org/doc/html/draft-ietf-idr-tunnel-encaps-15#sec=
tion-2

=20

3. Section. 5: could use an example with reference to figure 1.

=20

AF> Yup. Several people have asked for examples. We=E2=80=99ll add a =
pointer to  =
<https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-domain-inte=
rconnect-05> =
https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-domain-inter=
connect-05 section 7.

=20

4. Section 6: would be useful to describe, or provide pointer to section =
in the tunnel-encaps draft, stating logic for picking a specific =
encapsulation for a given packet.

=20

AF> The advertising node can include anything defined in either the =
Tunnel Encapsulation draft or any other subsequent drafts.  As indicated =
above, we are just defining new wrappers.

=20

Best,

Adrian


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style=3D'color:#0070C0;mso-fareast-language:EN-US'>Hi =
Ravi,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>I=E2=80=99m doing =
housekeeping on this draft and find your review. It looks like we =
didn=E2=80=99t respond =E2=80=93 sorry.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Many thanks for the =
careful review. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Comments =
are in line=E2=80=A6<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>Intended Status: Standards track (but is it the right =
one? Should this be informational instead, since no new encodings are =
explicitly specified)</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'><br><br></span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>Summary:</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>I have some minor concerns about this document that I =
think should be resolved before it is submitted to the =
IESG.</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>Comments:</span><o:p></o:p></p></div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>1. Draft track: does this need to be &quot;standards =
track=E2=80=9D? No new encodings are specified, even though there are =
requests for new IANA code-points.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:#0070C0;=
background:white'>AF&gt; The document asks for a code point from the =
=E2=80=9CBGP Tunnel Encapsulation Attribute Sub-TLVs&quot; registry for =
which the registration policy for this registry is Standards Action. So =
we have to be a Standards Track document.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>2. Section 3:</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
class=3Dapple-tab-span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
</span></span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>a. Auto-discovery: setting the route-target to SR-ID: =
how to avoid conflicts in regards to route-target settings: some may =
represent the SR ID and other represent non-SR constructs? Some text in =
that regard would be helpful.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
</span><span lang=3DEN-US style=3D'color:#0070C0;background:white'>These =
are not VPN routes so there shouldn=E2=80=99t be any conflict. But I =
think your question might be about what happens if other RTs need to be =
present on the same advertisement. And the answer is, =E2=80=9Cjust do =
it=E2=80=9D.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;background:white'><o:p>&nbsp;</o:p></span></p></di=
v><div><p class=3DMsoNormal><span class=3Dapple-tab-span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
</span></span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>b. The draft would do well to explicitly state what =
happens if the GWs in a given domain end up getting configured with =
different SR IDs.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
</span><span lang=3DEN-US style=3D'color:#0070C0;background:white'>We =
will add a little text.&nbsp; Basically they would not auto-discover =
each other and a receiver would just get the best route with only the =
advertising node=E2=80=99s tunnel encapsulation information.</span><span =
style=3D'color:#0070C0;background:white'><o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span class=3Dapple-tab-span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
</span></span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>c. Is there a specific reason why neither the format for =
the SR tunnel TLV is listed nor a pointer given to a pre-existing =
definition in another doc?</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
</span><span lang=3DEN-US style=3D'color:#0070C0;background:white'>We =
will add a reference to&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-idr-tunnel-encap=
s-15#section-2"><span =
style=3D'color:#0070C0'>https://datatracker.ietf.org/doc/html/draft-ietf-=
idr-tunnel-encaps-15#section-2</span></a></span><span =
style=3D'color:#0070C0;background:white'><o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>3. Section. 5: could use an example with reference to =
figure 1.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
Yup. Several people have asked for examples. We=E2=80=99ll add a pointer =
to </span><span lang=3DEN-US style=3D'color:#0070C0;background:white'><a =
href=3D"https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-doma=
in-interconnect-05"><span =
style=3D'color:#0070C0'>https://datatracker.ietf.org/doc/html/draft-farre=
l-spring-sr-domain-interconnect-05</span></a> section 7.</span><span =
style=3D'color:#0070C0;background:white'><o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>4. Section 6: would be useful to describe, or provide =
pointer to section in the tunnel-encaps draft, stating logic for picking =
a specific encapsulation for a given packet.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
</span><span lang=3DEN-US style=3D'color:#0070C0;background:white'>The =
advertising node can include anything defined in either the Tunnel =
Encapsulation draft or any other subsequent drafts.&nbsp; As indicated =
above, we are just defining new wrappers.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0;background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0;background:white'>Best,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0;background:white'>Adrian</span><span =
style=3D'color:#0070C0;background:white'><o:p></o:p></span></p></div></di=
v></div></body></html>
------=_NextPart_000_02AD_01D6700B.DF3DAA80--


From nobody Wed Aug 12 03:39:56 2020
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From: Emmanuel Baccelli <Emmanuel.Baccelli@inria.fr>
Date: Wed, 12 Aug 2020 12:39:27 +0200
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Cc: rtg-dir@ietf.org, draft-ietf-ccamp-layer0-types.all@ietf.org,  ccamp@ietf.org
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Subject: [RTG-DIR] RtgDir Last Call review: draft-ietf-ccamp-layer0-types-06.txt
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--000000000000f8aa7805acabcd65
Content-Type: text/plain; charset="UTF-8"

Hello,

I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review, and sometimes
on special request. The purpose of the review is to provide assistance to
the Routing ADs. For more information about the Routing Directorate, please
see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other IETF Last
Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-ietf-ccamp-layer0-types-06.txt
Reviewer: Emmanuel Baccelli
Review Date: Aug. 12th 2020
Intended Status: Proposed Standard

Summary:

    No issues found.

Comments:

    The draft is clear and readable, in the expected shape, as per RFC6087
as far as I can see (caveat: I am no YANG doctor).


    One comment on the security section, though: its content is pretty
generic. Would concrete examples not be useful there, to get an idea? (e.g.
what is the potential negative impact if data such as flexi-m or flexi-n
are overwritten by a hostile entity?)

Major Issues:

    No major issues found.

Minor Issues:

    No minor issues found.

--000000000000f8aa7805acabcd65
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello,<br><br>I have been selected as the Routing Director=
ate reviewer for this draft. The Routing Directorate seeks to review all ro=
uting or routing-related drafts as they pass through IETF last call and IES=
G review, and sometimes on special request. The purpose of the review is to=
 provide assistance to the Routing ADs. For more information about the Rout=
ing Directorate, please see <a href=3D"http://trac.tools.ietf.org/area/rtg/=
trac/wiki/RtgDir" target=3D"_blank">http://trac.tools.ietf.org/area/rtg/tra=
c/wiki/RtgDir</a><br><br>Although these comments are primarily for the use =
of the Routing ADs, it would be helpful if you could consider them along wi=
th any other IETF Last Call comments that you receive, and strive to resolv=
e them through discussion or by updating the draft.<br><br>Document: draft-=
ietf-ccamp-layer0-types-06.txt<br>Reviewer: Emmanuel Baccelli<br>Review Dat=
e: Aug. 12th 2020<br>Intended Status: Proposed Standard <br><br>Summary:<br=
><br>=C2=A0 =C2=A0 No issues found. <br><br>Comments:<br><br><div>=C2=A0 =
=C2=A0 The draft is clear and readable, in the expected shape, as per RFC60=
87 as far as I can see (caveat: I am no YANG doctor).</div><div><br></div><=
div><br></div>=C2=A0 =C2=A0 One comment on the security section, though: it=
s content is pretty generic. Would concrete examples not be useful there, t=
o get an idea? (e.g. what is the potential negative impact if data such as =
flexi-m or flexi-n are overwritten by a hostile entity?)<br><br>Major Issue=
s:<br><br>=C2=A0 =C2=A0 No major issues found.<br><br>Minor Issues:<br><br>=
=C2=A0 =C2=A0 No minor issues found.</div>

--000000000000f8aa7805acabcd65--


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From: "BRUNGARD, DEBORAH A" <db3546@att.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "'Loa Andersson'" <loa@pi.nu>, "'Eric Gray'" <eric.gray=40ericsson.com@dmarc.ietf.org>, "rtg-ads@ietf.org" <rtg-ads@ietf.org>
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Thread-Topic: [mpls] Rtg-Dir Last Call review of draft-ietf-mpls-spl-terminology-02.txt
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From nobody Wed Aug 12 11:21:30 2020
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To: "BRUNGARD, DEBORAH A" <db3546@att.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, 'Eric Gray' <eric.gray=40ericsson.com@dmarc.ietf.org>, "rtg-ads@ietf.org" <rtg-ads@ietf.org>
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From: Loa Andersson <loa@pi.nu>
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Subject: Re: [RTG-DIR] [mpls] Rtg-Dir Last Call review of draft-ietf-mpls-spl-terminology-02.txt
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Deborah,

I have posted version -03, it should be ready for IETF Last Call.

https://datatracker.ietf.org/doc/draft-ietf-mpls-spl-terminology/


/Loa
On 13/08/2020 01:08, BRUNGARD, DEBORAH A wrote:
> Agree with Loa's interpretation of "update" and Adrian's, I don't think it is helpful to a reader to be directed to read a long string of RFCs by this RFC. Of course, the IESG may question (as history has shown) our definition, but this is consistent with our approach on our RFCs.
> 
> Thanks Eric for double checking - and your careful review!
> Deborah
> 
> -----Original Message-----
> From: Adrian Farrel <adrian@olddog.co.uk>
> Sent: Tuesday, August 11, 2020 9:47 AM
> To: 'Loa Andersson' <loa@pi.nu>; 'Eric Gray' <eric.gray=40ericsson.com@dmarc.ietf.org>; rtg-ads@ietf.org
> Cc: rtg-dir@ietf.org; draft-ietf-mpls-spl-terminology.all@ietf.org; mpls@ietf.org
> Subject: RE: [mpls] Rtg-Dir Last Call review of draft-ietf-mpls-spl-terminology-02.txt
> 
> So I understand Eric's point about updates of updates.
> 
> We're updating 7274, and 7274 updated <insert long list here>, so surely we are updating <long list> as well.
> 
> What Loa says is that we are not updating the bit of 7274 that updated <long list>. He's right about that, but it is maybe not such a strong point. After all, someone directed from <member of list> to read 7274 might miss the wider material.
> 
> But I think that historically (Deborah to confirm) "updates" is only used for direct updating. That is, the reader is expected to walk through the chain of documents by finding "<member of list> is updated by 7274" and also finding "7274 is updated by [This.I-D]".
> 
> (This might all be different if we were obsoleting 7274, but we're not 😊)
> 
> A
> -----Original Message-----
> From: Loa Andersson <loa@pi.nu>
> Sent: 11 August 2020 11:41
> To: Eric Gray <eric.gray=40ericsson.com@dmarc.ietf.org>; rtg-ads@ietf.org
> Cc: rtg-dir@ietf.org; draft-ietf-mpls-spl-terminology.all@ietf.org; mpls@ietf.org
> Subject: Re: [mpls] Rtg-Dir Last Call review of draft-ietf-mpls-spl-terminology-02.txt
> 
> Eric,
> 
> Tnx for comments, very useful.
> 
> I will await instructions from Deborah and the post an updated version.
> Most of your are straightforward and will be updated as you  suggest.
> 
> Two small comments below.
> 
> On 11/08/2020 00:53, Eric Gray wrote:
> 
> The duplication of RFC 3202 is a typo.
> 
> As what update what in:
>> Note: I am not sure, but this may be more than a Nit - if, for instance, the intention was to list a different RFC.  The paragraph claims the draft updates RFC 7274 and RFC 3032 - but RFC 7274 claims to update RFC 3038, RFC 3209, RFC 3811, RFC 4182, RFC 4928, RFC 5331, RFC 5586, RFC 5921, RFC 5960, RFC 6391, RFC 6478, and RFC 6790 as well.
> 
> What RFC 7274 does to the listed RFCs is to rename them from "Resereved
> Labels" to "Special Purpose Labels"
> 
> The terminology draft aligns with this. First bullet in in Section 3
> says:
> 
> 
>      o  Collectively, the two ranges are known as Special Purpose Labels
>         (SPL).
> 
> The changes in this draft and RFC 7274 are not overlapping.
> 
> /Loa
> 

-- 

Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert                          loa.pi.nu@gmail.com
Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: "Grossman, Ethan A." <eagros@dolby.com>
To: "BRUNGARD, DEBORAH A" <db3546@att.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, 'Stewart Bryant' <stewart.bryant@gmail.com>
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Thread-Topic: [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10 and AD comments
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Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10 and AD comments
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Date: Fri, 14 Aug 2020 18:18:30 +0100
Cc: Stewart Bryant <stewart.bryant@gmail.com>, "BRUNGARD, DEBORAH A" <db3546@att.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-detnet-security.all@ietf.org" <draft-ietf-detnet-security.all@ietf.org>,  "detnet@ietf.org" <detnet@ietf.org>
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Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10 and AD comments
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Ethan

Why not ask the =E2=80=9Cusual suspects" to a call and we will go though =
the issues one by one and parcel out text assignments?

Stewart



> On 14 Aug 2020, at 17:36, Grossman, Ethan A. <eagros@dolby.com> wrote:
>=20
> Hi Adrian, Deborah, WG,=20
> Today (as editor of the Security draft) I am attempting to address =
Adrian's review comments. Reading through them, several of them are =
basically out of my depth, and I'm not sure how I would fill in the =
requested details, for example questions along the line of "you can't =
just say "the appropriate [measures]" you have to tell them what to do".
>=20
> Is there any chance anyone on this thread who has more domain =
knowledge than I do could spend a little time with me to give me some =
concrete clues as to what could be said to address some of these items? =
I can do the wordsmithing, and even some background reading, but it =
would be extremely helpful to get a well-informed shove in the right =
direction.=20
>=20
> My strategy today is to first address the nits and other =
straightforward items, and then as I attempt the others I will send out =
emails to the WG proposing as much text as I can conjure up, and it =
would be great if I got any responses. But if anyone has time for an =
impromptu webconf session to review the items en masse that would be =
appreciated; I can set that up on the spot.=20
>=20
> Thanks,
> Your faithful servant,
> Ethan.
>=20
> -----Original Message-----
> From: BRUNGARD, DEBORAH A <db3546@att.com>=20
> Sent: Thursday, August 13, 2020 4:21 PM
> To: adrian@olddog.co.uk; 'Stewart Bryant' <stewart.bryant@gmail.com>
> Cc: rtg-dir@ietf.org; draft-ietf-detnet-security.all@ietf.org; =
detnet@ietf.org
> Subject: RE: [Detnet] Rtgdir last call review of =
draft-ietf-detnet-security-10 and AD comments
>=20
> Hi,
>=20
> Much thanks Adrian for your review!
>=20
> Without getting into the debate on the term itself, I don't think MITM =
is concise enough. In RFC3552, MITM is just one of multiple active =
attack possibilities. Same for Injector, it also is an active attack. =
It's not simply MITM vs. injector. Stewart is correct - on-path can be =
an observer (passive). I think we need to define per RFC3552, not the =
Network Time Protocol threat model.  It would be better to align with =
the security terms and use on-path /off-path vs. internal/external. I =
think this is part of the confusion as the definition of internal in the =
document is mixing with the definition of MITM in RFC3552.
>=20
> The checked items in Figure 1 are not MITM (they could be done by a =
MITM), they are basically message modification (RFC3552). So I'm =
actually not sure the value of this breakdown of MITM vs. Injector? =
These terms are only used in 5.1 and Figure 1, they are not used in the =
rest of the document. Suggest it would be more accurate to simply say =
"active" (document already has the term in 5.1) and remove these =
terms/breakdown in Figure 1. Same for internal/external, they are not =
used in the rest of the document.
>=20
> Section 5.1 has the terms "active" and "passive" but doesn't define =
them. Need to define.
>=20
> The document is very comprehensive - congrats to the authors and the =
working group! With the couple of fixes to sort out the definitions in =
Section 5, it will be ready for the super scrutiny during Last Call/Sec =
ADs=F0=9F=98=8A
>=20
> Thanks,
> Deborah
> (recovering after a week without power)
>=20
> -----Original Message-----
> From: Adrian Farrel <adrian@olddog.co.uk>=20
> Sent: Friday, August 7, 2020 1:10 PM
> To: 'Stewart Bryant' <stewart.bryant@gmail.com>=20
> Cc: rtg-dir@ietf.org; draft-ietf-detnet-security.all@ietf.org; =
detnet@ietf.org
> Subject: RE: [Detnet] Rtgdir last call review of =
draft-ietf-detnet-security-10
>=20
> I can't decide whether to get into this or not =F0=9F=98=8A
>=20
> My review said, "It would be nice to avoid," not, "You must avoid."
> The review is principally for the AD, and they will tell you whether =
you need to action this.
> I made a constructive suggestion of an alternative phrase, but you are =
allowed to choose others.
>=20
> The thing about the term "man-in-the-middle" is not that it is =
directly making a specific man appear evil, it is that it associates the =
word "man" with the concept "evil" and therefore subtly changes the =
long-term perception of "man". There is, in fact, nothing about this =
type of attack that is specific to a man, and not all attackers are men, =
nor are all men attackers.
>=20
> This is a minor issue for me, and (to some extent) I wanted to =
experiment with draft-knodel-terminology to see what reaction it would =
get if the changes it suggests were made as a request rather than as an =
order.
>=20
> Cheers,
> Adrian
>=20
> -----Original Message-----
> From: Stewart Bryant <stewart.bryant@gmail.com>=20
> Sent: 06 August 2020 13:52
> To: Adrian Farrel <adrian@olddog.co.uk>
> Cc: rtg-dir@ietf.org; draft-ietf-detnet-security.all@ietf.org; =
detnet@ietf.org
> Subject: Re: [Detnet] Rtgdir last call review of =
draft-ietf-detnet-security-10
>=20
>=20
>> ---
>>=20
>> It would be nice to avoid the term "man-in-the-middle" (and =
coresponding
>> "MITM") in favour of the term "on-path attacker". It is less =
problematic
>> as a term, and no less accurate.
>>=20
>> Although "man-in-the-middle" is well established, I think you could
>> easily avoid it and if you feel necessary you could use "An on-path
>> attacker (formerly known as a man-in-the-middle) ..."
>=20
> I sort of understand why you want to change MITM, although given that =
the man you have in mind is evil I am not sure whether it is that =
objectionable in this context. However I am not sure on-path is the =
right term. MITM normally implies an entity that can modify traffic in =
flight, whereas an on path attacker may simply be an observer.
>=20
> Maybe AITM (attacker ....) would be a better gender neutral term.
>=20
> Stewart
>=20
>=20


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To: Stewart Bryant <stewart.bryant@gmail.com>
CC: "BRUNGARD, DEBORAH A" <db3546@att.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-detnet-security.all@ietf.org" <draft-ietf-detnet-security.all@ietf.org>, "detnet@ietf.org" <detnet@ietf.org>
Thread-Topic: [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10 and AD comments
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Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-security-10 and AD comments
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From nobody Fri Aug 14 11:55:28 2020
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From: Stewart Bryant via Datatracker <noreply@ietf.org>
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Subject: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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Reviewer: Stewart Bryant
Review result: Not Ready

I have been asked to review this by the Routing Directorate.

Summary

Although the are quite a few points below, a lot of them are editorials.
However I am a bit worried about the safety of the mechanism proposed which
seems to be rather more one-way that may be operationally safe.

Genarally the text is clear and well written.

Major Issues:

   In particular it is not the
   intention to undo the setting of the "T" flag.  Though it is possible
   to roll back (see Section 5.3), adding nodes that do not support
   [RFC8138] after a roll back may be problematic if the roll back did
   not fully complete.
SB> I see this as quite problematic. There are a number of reasons why you
might need to roll back: network merging, legacy nodes, bugs in the
implementation. I would think that you needed to be able to go backwards and
forwards, without difficulty and yet you give the impression that it really is
a one-way trip. I think that could be operationally problematic.

========

A node
   that cannot do so may remain connected to the network as a RUL, but
   how the node is modified to turn into a RUL is out of scope.
SB> That is quite worrying in practical deployments that this is not specified.

=======

   To ensure that a packet is forwarded across the RPL DODAG in the form
   in which it was generated, it is required that all the RPL nodes
   support [RFC8138] at the time of the switch.
SB> I am not sure if it is possible to implement the feature, but a safe
implementation would have them report that they support it and use that to
inhibit the setting of the T bit.

========
   When turning [RFC8138] compression off in the network, the Network
   Administrator MUST wait until all nodes have converged to the "T"
   flag reset before allowing nodes that do not support the compression
   in the network.
SB> How does it know that this has happened?

=========

7.  Security Considerations

   First of all, it is worth noting that with [RFC6550], every node in
   the LLN that is RPL-aware can inject any RPL-based attack in the
   network.  A trust model has to be put in place in an effort to
   exclude rogue nodes from participating to the RPL and the 6LoWPAN
   signaling, as well as from the data packet exchange.  This trust
   model could be at a minimum based on a Layer-2 Secure joining and the
   Link-Layer security.  This is a generic RPL and 6LoWPAN requirement,
   see Req5.1 in Appendix of [RFC8505].
SB> I am surprised there is not a MUST in the above considering the
vulnerability.

======

   An attacker in the middle of the network may reset the "T" flag to
   cause extra energy spending in its subDAG.  Conversely it may set the
   "T" flag, so that nodes located downstream would compress when that
   it is not desired, potentially resulting in the loss of packets.  In
   a tree structure, the attacker would be in position to drop the
   packets from and to the attacked nodes.  So the attacks above would
   be more complex and more visible than simply dropping selected
   packets.  The downstream node may have other parents and see both
   settings, which could raise attention.
SB> I am worried that there are no real mitigations to this. The attack may be
a bug.

=========

Minor Issues

   The suggested bit position of the "T" flag is indicated in Section 6.
SB> I know that you need to go through the IANA process, but future readers
SB> will find the text a lot easier to follow if the bit is included in
SB> Fig 1 above.
SB>
SB> Presumably the base spec sends with the T bit clear and thus the
SB> feature is disabled. It might not hurt to remind the reader of this as it
is what gives you the backwards compatibility.

========

   A router MUST uncompress a packet that is to be forwarded to an
   external target.
SB> Is there not a config option to retain compression to a consenting external
party?

========

6.  IANA Considerations

It would be clearer if there were an IANA/Editor request to also edit Fig 1

========

Nits/Editorials

Otherwise, a non-capable node acting as leaf-only would fail to
SB> would be clearer as non-RPL-capable

========

   communicate, and acting as a router it would drop the compressed
SB> Perhaps:  and if acting

========

   The idea is to use the flag to maintain the compression inactive
SB> Perhaps : The flag is cleared to maintain the compression inactive state

=========

   A node SHOULD source packets in the compressed form using [RFC8138]
SB> source or send?

==========

   The decision of using [RFC8138] is made by the originator of the
SB> the decision to use

==========

A router that encapsulates a packet is the
   originator of the resulting packet and is responsible to compress the
SB> for compressing

==========

In most cases, packets from and to an external target are
SB> "to and from" is more conventional English

==========

Enabling the [RFC8138] compression
   without a turn-on signaling requires a "flag day"; all nodes must be
   upgraded, and then the network can be rebooted with the [RFC8138]
   compression turned on.

SB> I am not sure my English is any better below, but the text could use a
little polish

Enabling the [RFC8138] compression without a turn-on signaling method requires
a "flag day"; by which time all nodes must be upgraded, and at which point the
network can be rebooted with the [RFC8138]compression turned on.




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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Stewart Bryant <stewart.bryant@gmail.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>
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Thread-Topic: Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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Subject: Re: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Stewart Bryant <stewart.bryant@gmail.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>
Thread-Topic: Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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Subject: Re: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Routing Over Low power and Lossy networks =
WG of the IETF.

        Title           : A RPL DODAG Configuration Option for the 6LoWPAN =
Routing Header
        Authors         : Pascal Thubert
                          Li Zhao
        Filename        : draft-ietf-roll-turnon-rfc8138-11.txt
        Pages           : 9
        Date            : 2020-08-27

Abstract:
   This document updates RFC 8138 by defining a bit in the RPL DODAG
   Configuration Option to indicate whether compression is used within
   the RPL Instance, and specify the behavior of RFC 8138-capable nodes
   when the bit is set and reset.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-roll-turnon-rfc8138/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-turnon-rfc8138-11
https://datatracker.ietf.org/doc/html/draft-ietf-roll-turnon-rfc8138-11

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-roll-turnon-rfc8138-11


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: Alvaro Retana <aretana.ietf@gmail.com>
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To: Stewart Bryant <stewart.bryant@gmail.com>,  "Pascal Thubert (pthubert)" <pthubert=40cisco.com@dmarc.ietf.org>
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Subject: Re: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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On August 27, 2020 at 8:03:52 AM, Pascal Thubert wrote:


Hi!


> I just published 11 that has the proposed changes below

Looking at those changes, there's only one thing that doesn't work for me.


...
> > 7. Security Considerations
> >
> > First of all, it is worth noting that with [RFC6550], every node in
> > the LLN that is RPL-aware can inject any RPL-based attack in the
> > network. A trust model has to be put in place in an effort to
> > exclude rogue nodes from participating to the RPL and the 6LoWPAN
> > signaling, as well as from the data packet exchange. This trust
> > model could be at a minimum based on a Layer-2 Secure joining and the
> > Link-Layer security. This is a generic RPL and 6LoWPAN requirement,
> > see Req5.1 in Appendix of [RFC8505].
>
> > SB> I am surprised there is not a MUST in the above considering the
> > vulnerability.
>
> True, changing to
> "
> A trust model is REQUIRED in an effort to exclude rogue nodes...
> "

The resulting paragraph now reads:

=C2=A0 =C2=A0First of all, it is worth noting that with [RFC6550], every no=
de in
=C2=A0 =C2=A0the LLN that is RPL-aware can inject any RPL-based attack in t=
he
=C2=A0 =C2=A0network. =C2=A0A trust model is REQUIRED in an effort to exclu=
de rogue
=C2=A0 =C2=A0nodes from participating to the RPL and the 6LoWPAN signaling,=
 as
=C2=A0 =C2=A0well as from the data packet exchange. =C2=A0This trust model =
could at a
=C2=A0 =C2=A0minimum be based on a Layer-2 Secure joining and the Link-Laye=
r
=C2=A0 =C2=A0security. =C2=A0This is a generic RPL and 6LoWPAN requirement,=
 see Req5.1
=C2=A0 =C2=A0in Appendix of [RFC8505].


Normatively requiring a trust model in this document doesn't work for
me for several reasons:

(1) The text points at a vulnerability present in all rfc6550
deployments, not something new to this document. =C2=A0The paragraph is
used to set up the discussion in the rest of the section.

(2) There is no specific trust model to test compliance with; instead,
the text is tentative: "trust model could at a minimum be based
on...". =C2=A0If we're going to make something REQUIRED, then we should be
able to point at what that is.

(3) The last sentence says that the trust model is already a "generic
RPL and 6LoWPAN requirement", which supports, even more, the point
about the issue not being specific to this document.


These reasons, and the fact that authorization doesn't prevent a node
from becoming rogue, led me to initially suggest not using MUST (in my
review of -07).

Having said all that, we should also explicitly point at the security
of the base spec. =C2=A0I would even go for something simpler:

Suggestion>

=C2=A0 =C2=A0It is worth noting that with [RFC6550], every node in the LLN =
that is
=C2=A0 =C2=A0RPL-aware can inject any RPL-based attack in the network. =C2=
=A0This document
=C2=A0 =C2=A0assumes that the security mechanisms as defined in [RFC6550] a=
re followed.


Thanks!

Alvaro.


From nobody Thu Aug 27 10:05:43 2020
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, Stewart Bryant <stewart.bryant@gmail.com>
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Thread-Topic: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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From: Alvaro Retana <aretana.ietf@gmail.com>
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, Stewart Bryant <stewart.bryant@gmail.com>
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Subject: Re: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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Sure=E2=80=A6

I just to want to recommend anything that is not already specified
somewhere else for RPL.  :-)

On August 27, 2020 at 1:05:39 PM, Pascal Thubert (pthubert) (
pthubert@cisco.com) wrote:

Hello Alvaro =F0=9F=98=8A

I see your point.

> It is worth noting that with [RFC6550], every node in the LLN that is
> RPL-aware can inject any RPL-based attack in the network. This document
> assumes that the security mechanisms as defined in [RFC6550] are
followed.

This should be clarified a little bit. RPL has a security mechanism that to
my best knowledge no one uses (
https://tools.ietf.org/html/rfc6550#section-10).
What everyone uses is a Layer 2 access security. The text above seems to
recommend to use RPL's secured mode. Is there a way to reword that a bit?

Take care,

Pascal

--0000000000007f451305addf1ce0
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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div style=3D"font-family:Helve=
tica,Arial;font-size:13px">Sure=E2=80=A6</div><div style=3D"font-family:Hel=
vetica,Arial;font-size:13px"><br></div><div style=3D"font-family:Helvetica,=
Arial;font-size:13px">I just to want to recommend anything that is not alre=
ady specified somewhere else for RPL. =C2=A0:-)</div> <br><p class=3D"airma=
il_on">On August 27, 2020 at 1:05:39 PM, Pascal Thubert (pthubert) (<a href=
=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>) wrote:</p> <blockquo=
te type=3D"cite" class=3D"clean_bq"><span><div><div></div><div>Hello Alvaro=
 =F0=9F=98=8A
<br>
<br>I see your point. =20
<br>
<br>&gt;    It is worth noting that with [RFC6550], every node in the LLN t=
hat is
<br>&gt;    RPL-aware can inject any RPL-based attack in the network.  This=
 document
<br>&gt;    assumes that the security mechanisms as defined in [RFC6550] ar=
e followed.
<br>
<br>This should be clarified a little bit. RPL has a security mechanism tha=
t to my best knowledge no one uses (<a href=3D"https://tools.ietf.org/html/=
rfc6550#section-10">https://tools.ietf.org/html/rfc6550#section-10</a>).
<br>What everyone uses is a Layer 2 access security. The text above seems t=
o recommend to use RPL&#39;s secured mode. Is there a way to reword that a =
bit?
<br>
<br>Take care,
<br>
<br>Pascal
<br>
<br></div></div></span></blockquote> <div class=3D"gmail_signature"></div><=
/body></html>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, Stewart Bryant <stewart.bryant@gmail.com>
CC: "rtg-dir@ietf.org" <rtg-dir@ietf.org>
Thread-Topic: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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Subject: Re: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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Subject: Re: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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Pascal:


The link-layer security is a mechanism that applies to all the RPL
messages.  It doesn=E2=80=99t just apply to messages associated with this
document.  Making it required (or even just normatively recommending it) in
this document feels like overreaching because we=E2=80=99re just defining a=
 flag,
not changing how the RPL adjacency works.

I rather go with something akin to the Security Considerations in, for
example, draft-ietf-roll-efficient-npdao (also approved by Ben)=E2=80=A6whi=
ch is
where I borrowed the "This document assumes that the security mechanisms as
defined in [RFC6550] are followed=E2=80=A6=E2=80=9D phrase from.


BTW, we should at least point the reader to the Security Considerations in
rfc6550 and rfc8138.


Thanks!

Alvaro.



On August 27, 2020 at 1:45:09 PM, Pascal Thubert (pthubert) (
pthubert@cisco.com) wrote:

Hello again Alvaro



We had a pass on similar text (with Benjamin K.) for the IESG review of
https://tools.ietf.org/html/draft-ietf-6lo-fragment-recovery-21 (now in RFC
ED queue) and ended up with



   As indicated in [FRAG-FWD
<https://tools.ietf.org/html/draft-ietf-6lo-fragment-recovery-21#ref-FRAG-F=
WD>],
Secure joining and the Link-Layer

   security are REQUIRED to protect against those attacks, as the

   fragmentation protocol does not include any native security

   mechanisms.



Indeed this requirement is common to anything 6LoWPAN or RPL. And MUSTing
it in the form above seemed to reach consensus.

In the case of RPL alone it=E2=80=99s either as above or one of RPL=E2=80=
=99s secured
modes, preinstalled of authenticated. RPL=E2=80=99s security section discus=
ses the
last to but does not really say what to do with Unsecured. We could fill
that gap.



What about combining all this as:

=E2=80=9C

It is worth noting that with [RFC6550], every node in the LLN that is
RPL-aware can inject any RPL-based attack in the network.

This document assumes that the RPL exchange are protected against on-link
attacks such as forged and replayed packets.

Section 10 of [RPL] proposes 3 security modes, Unsecured, Preinstalled and
Authenticated.

In the Unsecured Mode, secure joining and the Link-Layer security are
REQUIRED to protect against those attacks.

=E2=80=9C



Keep safe,



Pascal

*From:* Alvaro Retana <aretana.ietf@gmail.com>
*Sent:* jeudi 27 ao=C3=BBt 2020 19:18
*To:* Pascal Thubert (pthubert) <pthubert@cisco.com>; Stewart Bryant <
stewart.bryant@gmail.com>
*Cc:* rtg-dir@ietf.org
*Subject:* RE: [RTG-DIR] Rtgdir last call review of
draft-ietf-roll-turnon-rfc8138-10



Sure=E2=80=A6



I just to want to recommend anything that is not already specified
somewhere else for RPL.  :-)



On August 27, 2020 at 1:05:39 PM, Pascal Thubert (pthubert) (
pthubert@cisco.com) wrote:

Hello Alvaro =F0=9F=98=8A

I see your point.

> It is worth noting that with [RFC6550], every node in the LLN that is
> RPL-aware can inject any RPL-based attack in the network. This document
> assumes that the security mechanisms as defined in [RFC6550] are
followed.

This should be clarified a little bit. RPL has a security mechanism that to
my best knowledge no one uses (
https://tools.ietf.org/html/rfc6550#section-10).
What everyone uses is a Layer 2 access security. The text above seems to
recommend to use RPL's secured mode. Is there a way to reword that a bit?

Take care,

Pascal

--0000000000000f438f05ade12c7f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div style=3D"font-family:Helve=
tica,Arial;font-size:13px">Pascal:</div><div style=3D"font-family:Helvetica=
,Arial;font-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;=
font-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;font-si=
ze:13px">The link-layer security is a mechanism that applies to all the RPL=
 messages.=C2=A0 It doesn=E2=80=99t just apply to messages associated with =
this document.=C2=A0 Making it required (or even just normatively recommend=
ing it) in this document feels like overreaching because we=E2=80=99re just=
 defining a flag, not changing how the RPL adjacency works.</div><div style=
=3D"font-family:Helvetica,Arial;font-size:13px"><br></div><div style=3D"mar=
gin:0px"><span style=3D"font-family:Helvetica,Arial;font-size:13px">I rathe=
r go with something akin to the Security Considerations in, for example,=C2=
=A0draft-ietf-roll-efficient-npdao (also approved by Ben)=E2=80=A6which is =
where I borrowed the &quot;</span>This document assumes that the security m=
echanisms as defined in [RFC6550] are followed=E2=80=A6=E2=80=9D phrase fro=
m.</div><div style=3D"margin:0px"><br></div><div style=3D"margin:0px"><br><=
/div><div style=3D"margin:0px">BTW, we should at least point the reader to =
the Security Considerations in rfc6550 and rfc8138.</div><div style=3D"marg=
in:0px"><br></div><div style=3D"margin:0px"><br></div><div style=3D"margin:=
0px">Thanks!</div><div style=3D"margin:0px"><br></div><div style=3D"margin:=
0px">Alvaro.</div><div style=3D"font-family:Helvetica,Arial;font-size:13px"=
><br></div><div style=3D"font-family:Helvetica,Arial;font-size:13px"><br></=
div> <br><p class=3D"airmail_on">On August 27, 2020 at 1:45:09 PM, Pascal T=
hubert (pthubert) (<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com=
</a>) wrote:</p> <blockquote type=3D"cite" class=3D"clean_bq"><span><div la=
ng=3D"EN-US" link=3D"blue" vlink=3D"purple"><div></div><div>






<div class=3D"WordSection1">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Hello again Alvaro</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">We had a pass on similar text (with Benjamin K.) for the IES=
G review of
<a href=3D"https://tools.ietf.org/html/draft-ietf-6lo-fragment-recovery-21"=
>https://tools.ietf.org/html/draft-ietf-6lo-fragment-recovery-21</a> (now i=
n RFC ED queue) and ended up with</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0</span></font>=
</p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 As indi=
cated in [<a href=3D"https://tools.ietf.org/html/draft-ietf-6lo-fragment-re=
covery-21#ref-FRAG-FWD">FRAG-FWD</a>], Secure joining and the
 Link-Layer</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 securit=
y are REQUIRED to protect against those attacks, as the</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 fragmen=
tation protocol does not include any native security</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Courier New"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 mechani=
sms.</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Indeed this requirement is common to anything 6LoWPAN or RPL=
. And MUSTing it in the form above seemed to reach consensus.</span></font>=
</p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">In the case of RPL alone it=E2=80=99s either as above or one=
 of RPL=E2=80=99s secured modes, preinstalled of authenticated. RPL=E2=80=
=99s security section discusses the last to but does not really say
 what to do with Unsecured. We could fill that gap.</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">What about combining all this as:</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=E2=80=9C</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">It is worth n=
oting that with [RFC6550], every node in the LLN that is RPL-aware can inje=
ct any RPL-based attack in the network.
</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">This document=
 assumes that the RPL exchange are protected against on-link attacks such a=
s forged and replayed packets.</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">Section 10 of=
 [RPL] proposes 3 security modes, Unsecured, Preinstalled and Authenticated=
.
</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">In the Unsecu=
red Mode, secure joining and the Link-Layer security are REQUIRED to protec=
t against those attacks.
</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=E2=80=9C</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Keep safe,</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Pascal</span></font></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 #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11.0pt;font-weight:bold">From:</span></font></b> Alvaro Retana &l=
t;<a href=3D"mailto:aretana.ietf@gmail.com">aretana.ietf@gmail.com</a>&gt;
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> jeudi 27 ao=C3=BBt 202=
0 19:18<br>
<b><span style=3D"font-weight:bold">To:</span></b> Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>&gt;; Ste=
wart Bryant &lt;<a href=3D"mailto:stewart.bryant@gmail.com">stewart.bryant@=
gmail.com</a>&gt;<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> <a href=3D"mailto:rtg-di=
r@ietf.org">rtg-dir@ietf.org</a><br>
<b><span style=3D"font-weight:bold">Subject:</span></b> RE: [RTG-DIR] Rtgdi=
r last call review of draft-ietf-roll-turnon-rfc8138-10</p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">=C2=A0</span></font></p>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">Sure=E2=80=A6=
</span></font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">=C2=A0</span>=
</font></p>
</div>
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">I just to wan=
t to recommend anything that is not already specified somewhere else for RP=
L. =C2=A0:-)</span></font></p>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">=C2=A0</span>=
</font></p>
<p class=3D"airmailon"><font size=3D"2" face=3D"Helvetica"><span style=3D"f=
ont-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">On August 27,=
 2020 at 1:05:39 PM, Pascal Thubert (pthubert) (</span></font><a href=3D"ma=
ilto:pthubert@cisco.com"><font size=3D"2" face=3D"Helvetica"><span style=3D=
"font-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">pthubert@ci=
sco.com</span></font></a><font size=3D"2" face=3D"Helvetica"><span style=3D=
"font-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">)
 wrote:</span></font></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><font size=3D"2" face=
=3D"Helvetica"><span style=3D"font-size:10.0pt;font-family:&quot;Helvetica&=
quot;,sans-serif">Hello Alvaro
</span></font><font size=3D"2" face=3D"Segoe UI Emoji"><span style=3D"font-=
size:10.0pt;font-family:&quot;Segoe UI Emoji&quot;,sans-serif">=F0=9F=98=8A=
</span></font><font size=3D"2" face=3D"Helvetica"><span style=3D"font-size:=
10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">
<br>
<br>
I see your point. <br>
<br>
&gt; It is worth noting that with [RFC6550], every node in the LLN that is =
<br>
&gt; RPL-aware can inject any RPL-based attack in the network. This documen=
t <br>
&gt; assumes that the security mechanisms as defined in [RFC6550] are follo=
wed. <br>
<br>
This should be clarified a little bit. RPL has a security mechanism that to=
 my best knowledge no one uses (</span></font><a href=3D"https://tools.ietf=
.org/html/rfc6550#section-10"><font size=3D"2" face=3D"Helvetica"><span sty=
le=3D"font-size:10.0pt;font-family:&quot;Helvetica&quot;,sans-serif">https:=
//tools.ietf.org/html/rfc6550#section-10</span></font></a><font size=3D"2" =
face=3D"Helvetica"><span style=3D"font-size:10.0pt;font-family:&quot;Helvet=
ica&quot;,sans-serif">).
<br>
What everyone uses is a Layer 2 access security. The text above seems to re=
commend to use RPL&#39;s secured mode. Is there a way to reword that a bit?
<br>
<br>
Take care, <br>
<br>
Pascal </span></font></p>
</div>
</div>
</blockquote>
</div>
</div>


</div></div></span></blockquote> <div class=3D"gmail_signature"></div></bod=
y></html>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>
CC: Stewart Bryant <stewart.bryant@gmail.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>
Thread-Topic: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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From: Alvaro Retana <aretana.ietf@gmail.com>
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, Stewart Bryant <stewart.bryant@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/TqCsKb4-9jfUSGcYW2S51kDEBIk>
Subject: Re: [RTG-DIR] Rtgdir last call review of draft-ietf-roll-turnon-rfc8138-10
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--000000000000253e4605ade20552
Content-Type: text/plain; charset="UTF-8"
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Hi!

If we want to close the gap, it should probably be in a document that
Updates rfc6550.   Or maybe the WG wants to wait until RPLv2 and do it
there=E2=80=A6

:-)

Take care!

Alvaro.

On August 27, 2020 at 4:38:24 PM, Pascal Thubert (pthubert) (
pthubert@cisco.com) wrote:

Hello Alvaro

The point is if the security measures in RPL are not turned on, it=E2=80=99=
s either
L2 security or none at all.

Shouldn=E2=80=99t we mandate L2 security in that case?

The quote from NP DAO is imprecise in that the security section in RPL only
discusses the secured modes.  RFC 6550 says nothing in case of unsecured
because we expected secured. It fails to recommend L2 security. The NPDAO
text this inherits that gap.

The real world decided otherwise  and uses L2 security ubiquitously.
Shouldn=E2=80=99t we reflect that ? Saying that we expect RPL security is a=
 denial
of the world around us.

So I=E2=80=99m good with your proposal but I feel the gap should be closed
somewhere.  Agreed this is but a side spec, but then where should that be?

Take care,

Pascal

--000000000000253e4605ade20552
Content-Type: text/html; charset="UTF-8"
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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div style=3D"font-family:Helve=
tica,Arial;font-size:13px">Hi!</div><div style=3D"font-family:Helvetica,Ari=
al;font-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;font=
-size:13px">If we want to close the gap, it should probably be in a documen=
t that Updates rfc6550. =C2=A0 Or maybe the WG wants to wait until RPLv2 an=
d do it there=E2=80=A6</div><div style=3D"font-family:Helvetica,Arial;font-=
size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;font-size:13=
px">:-)</div><div style=3D"font-family:Helvetica,Arial;font-size:13px"><br>=
</div><div style=3D"font-family:Helvetica,Arial;font-size:13px">Take care!<=
/div><div style=3D"font-family:Helvetica,Arial;font-size:13px"><br></div><d=
iv style=3D"font-family:Helvetica,Arial;font-size:13px">Alvaro.</div> <br><=
p class=3D"airmail_on">On August 27, 2020 at 4:38:24 PM, Pascal Thubert (pt=
hubert) (<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>) wrot=
e:</p> <blockquote type=3D"cite" class=3D"clean_bq"><span><div dir=3D"auto"=
><div></div><div>




Hello Alvaro
<div><br>
</div>
<div>The point is if the security measures in RPL are not turned on, it=E2=
=80=99s either L2 security or none at all. =C2=A0</div>
<div><br>
</div>
<div>Shouldn=E2=80=99t we mandate L2 security in that case?</div>
<div><br>
</div>
<div>The quote from NP DAO is imprecise in that the security section in RPL=
 only discusses the secured modes.=C2=A0 RFC 6550 says nothing in case of u=
nsecured because we expected secured. It fails to recommend L2 security. Th=
e NPDAO text this inherits that gap.</div>
<div><br>
</div>
<div>The real world decided otherwise =C2=A0and uses L2 security ubiquitous=
ly. Shouldn=E2=80=99t we reflect that ? Saying that we expect RPL security =
is a denial of the world around us.</div>
<div><br>
</div>
<div>So I=E2=80=99m good with your proposal but I feel the gap should be cl=
osed somewhere.=C2=A0 Agreed this is but a side spec, but then where should=
 that be?<br>
<div dir=3D"ltr">
<div><br>
</div>
Take care,<br>
<div><br>
</div>
<div>Pascal</div></div></div></div></div></span></blockquote></body></html>

--000000000000253e4605ade20552--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>
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