Re: [ipwave] Some review comments for draft-ietf-ipwave-vehicular-networking-11

CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es> Mon, 24 February 2020 08:16 UTC

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From: CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es>
Date: Mon, 24 Feb 2020 09:15:47 +0100
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To: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
Cc: Russ Housley <housley@vigilsec.com>, Suresh Krishnan <Suresh@kaloom.com>, its <its@ietf.org>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>, =?UTF-8?B?6rmA7Kad7J28IOq4gOuhnOuyjFImROuniOyKpO2EsA==?= <endland@hyundai.com>, =?UTF-8?B?6rmA7KCV7ZiEIO2VmeyDnQ==?= <claw7@naver.com>
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Subject: Re: [ipwave] Some review comments for draft-ietf-ipwave-vehicular-networking-11
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Hi Paul,

I've checked version -13, and it has certainly improved compared to -12.
However, there are still comments that have not been completely addressed.
Please find below the main ones I still have.

- Page 4 (but also later in different parts of the doc): Mobility Anchor
(MA): is this term coined somewhere you can reference? It is mentioned as a
component of a vehicular architecture, but it is not discussed why, not
even why an IPv6 mobility solution is needed in a vehicular scenario. It
might seem like straightforward, but you need to present that need. This
comment still applies. The term MA is not a standard one and the need for
it is not properly explained.

- The use cases section still does not help much on identifying
requirements. Vehicular Neighbor Discovery (VND), Vehicular Mobility
Management (VMM), and Vehicular Security and Privacy (VSP) in vehicular
networks appear as “new” functions, but what the use cases should reflect
is the gaps of current IPv6 mechanisms that need to be addressed. We don’t
need to define new “vehicular-specific” functions, but rather to identify
the extensions to existing protocols that vehicular scenarios bring.

- Section 4 should introduce a generic vision of what vehicular networks
architectures might look like, again to help the purpose of identifying
requirements. Current section is still making quite a lot of assumptions
about how the architecture looks like without properly justifying them.The
text now mentions that it is “an exemplary architecture” to support the use
cases, which might be OK, but I’m afraid it might raise many questions on
why we don’t try to use existing known architectures and pinpointing where
there are gaps.

- “For an IPv6 communication between an IP-OBU and an IP-RSU or between two
neighboring IP-OBUs, network parameters need to be shared among them, such
as MAC layer and IPv6 layer information.  The MAC layer information
includes wireless link layer parameters, transmission power level, the MAC
address of an external network interface for the internetworking with
another IP-OBU or IP-RSU.  The IPv6 layer information includes the IPv6
address and network prefix of an external network interface for the
internetworking with another IP-
OBU or IP-RSU.” --> I still don’t see a clear justification on the need for
exchanging prefix information... I'm not judging if this is needed or not,
just saying that the draft does not really backs that need.

- There are multiple assumptions in the draft about the way IPv6 addressing
will be used (e.g., multiple vehicles sharing a prefix in Figure 1, control
and data separation, certain network topologies in Figure 2) that are not
explained. Why those assumptions and not others? Any reference supporting
them? The document kind of assumes a prefix model that is not properly
introduced. Issues cannot be derived from the use of a prefix model that is
not well introduced.

- All the discussion on ND timers is again very much solution specific and
should be avoided.

Thanks,

Carlos

On Mon, Jan 6, 2020 at 6:49 PM Mr. Jaehoon Paul Jeong <
jaehoon.paul@gmail.com> wrote:

> Hi Carlos and Russ,
> Here is the revision -13 of our IPWAVE PS draft according to Carlos'
> comments:
> https://tools.ietf.org/html/draft-ietf-ipwave-vehicular-networking-13
>
> I attach the revision letter to show how I addressed comments in the
> revision.
>
> If you are satisfied with my revision, please let me know.
>
> I will ask five reviewers to review this version for WGLC.
>
> Thanks.
>
> Best Regards,
> Paul
>
> On Sat, Nov 16, 2019 at 2:06 PM CARLOS JESUS BERNARDOS CANO <
> cjbc@it.uc3m.es> wrote:
>
>> Hi Paul,
>>
>> I’ve reviewed the draft. I think the draft is in better shape than last
>> time I checked, but it is not yet ready. I’m afraid I have quite some
>> comments. Please see below:
>>
>> - I think the title (and the text in many parts of the document) should
>> be changed to refer to IPv6, instead of IP, as the document (and the WG) is
>> IPv6 specific. Another example: we should not mention Mobile IPv4 in the
>> document (as done currently in page 2).
>>
>> - Page 4 (but also later in different parts of the doc): Mobility Anchor
>> (MA): is this term coined somewhere you can reference? It is mentioned as a
>> component of a vehicular architecture, but it is not discussed why, not
>> even why an IPv6 mobility solution is needed in a vehicular scenario. It
>> might seem like straightforward, but you need to present that need.
>>
>> - Page 4: the terms OBU and RSU should be aligned with what the basic OCB
>> draft uses (IP-OBU and IP-RSU) and probably refer to that document. Besides
>> I understand OBU and RSUs as single IP devices, not set of nodes as the
>> document currently defines.
>>
>> - Page 5: V2I2P and V2I2V deserve additional explanation.
>>
>> - The use cases should serve not only to present areas where vehicular
>> networks can be used, but also to support requirements for IPv6 in such
>> environments. Current text does not help much on identifying requirements.
>>
>> - Section 4 should introduce a generic vision of what vehicular networks
>> architectures might look like, again to help the purpose of identifying
>> requirements. I’m afraid current section is making quite a lot of
>> assumptions about how the architecture looks like without properly
>> justifying them. Examples are: the presence of a Mobility Anchor, using
>> Ethernet links to interconnect RSUs or the subnet/prefix model. I think the
>> proposed architecture might make sense, but it is not THE architecture (if
>> it was, we should be referring to the doc where it is specified), but an
>> example of potential architecture. It’d be right to present an exemplary
>> architecture to support the use cases and problem statement, but the
>> document should clearly state that.
>>
>> - Related to the former, the document assumes that IPv6 mobility is a key
>> requirement. While I don’t disagree with that, the document should support
>> that assumption backed up by requirements from use cases.
>>
>> - Figure 2: the vision of the RSU having multiple routers, hosts, etc,
>> inside... where does it come from? It’s new to me. Similarly, on the
>> vehicle I’d expect Router1 to be an IP-OBU. Related to this comment, first
>> paragraph of Section 4.2 talks about the RSU architecture without providing
>> any reference. Why is it needed to have a DNS server internally? I don’t
>> see why this is needed or specific to vehicular networks.
>>
>> - Page 12: all the discussion about the need for exchanging prefix
>> information comes out of the blue, there is no proper discussion why this
>> is a requirement. And then the document gets into mentioning an example of
>> solution for this, which is something that should be avoided (this document
>> is not about solution space), unless we were analyzing different approaches
>> to solve a given problem.
>>
>> - Page 12: as mentioned above, I don’t see why we need the DNS discussion.
>>
>> - Figure 2 makes assumptions on network topology and subnetting that is
>> not explained.
>>
>> - Page 14: the discussion on prevention of false reports of accidents is
>> application-layer specific, not IPv6 specific, and therefore it is not in
>> the scope of this document.
>>
>> - Section 5.1 is a critical one (actually the whole section 5) and I
>> think it needs significant work. I’d discuss link model issues before going
>> into neighbor discovery protocol specific issues. Current text seem to have
>> already a solution in mind when describing the issues, while what it should
>> do is derive requirements, and explain why current solutions are not
>> sufficient. For example, it should not start saying that DAD and ND-related
>> parameters need to be extended before introducing why current DAD and ND is
>> not sufficient.
>>
>> - All the discussion on ND timers is again very much solution specific
>> and should be avoided. And the discussion about NHTSA and the collision is
>> also not appropriate, as one thing is the delay at application layer and a
>> different thing is the timers used for ND.
>>
>> - Page 16 and page 17: the text assumes a prefix model for a vehicular
>> network that is not properly introduced and justified. Issues cannot be
>> derived from the use of a prefix model that is not well introduced.
>>
>> - Page 18: the discussion about notifying changes on the IP address
>> should be removed if it is assumed that there is an IPv6 mobility protocol
>> in place (which seems to be the case) as this is taken care by it.
>>
>> - Section 5.1.3: again it goes too much into solution space without
>> presenting the scenario and the issues. This document is not about talking
>> solutions.
>>
>> - Section 5.2: same comment as before. Solution space specifics should be
>> removed.
>>
>> - Section 6 needs significant work as well. First, I’d like to have some
>> kind of structure in terms of presenting the security and privacy issues
>> that are specific to the vehicular environment. And then, we need to have a
>> list of issues/requirements instead of again going too much into solution
>> space.
>>
>> We can sit together in Singapore to discuss about how to address these
>> comments.
>>
>> Thanks,
>>
>> Carlos
>>
>> On Thu, 7 Nov 2019 at 08:30, Mr. Jaehoon Paul Jeong <
>> jaehoon.paul@gmail.com> wrote:
>>
>>> Carlos,
>>> Great!
>>>
>>> Sure you soon in Singapore.
>>>
>>> Thanks.
>>>
>>> Paul
>>>
>>> On Thu, Nov 7, 2019 at 9:08 AM CARLOS JESUS BERNARDOS CANO <
>>> cjbc@it.uc3m.es> wrote:
>>>
>>>> Hi Paul,
>>>>
>>>> I have to do my review first. You'll have it by the Singapore meeting
>>>> so we can discuss there.
>>>>
>>>> Thanks,
>>>>
>>>> Carlos
>>>>
>>>> On Wed, Nov 6, 2019 at 3:29 AM Mr. Jaehoon Paul Jeong <
>>>> jaehoon.paul@gmail.com> wrote:
>>>>
>>>>> Hi Carlos,
>>>>> I am wondering what next steps our IPWAVE PS draft will take.
>>>>> If you are satisfied with my revision, could you do the WG Last Call
>>>>> on this version?
>>>>> https://tools.ietf.org/html/draft-ietf-ipwave-vehicular-networking-12
>>>>>
>>>>>
>>>>> Thanks.
>>>>>
>>>>> Best Regards,
>>>>> Paul
>>>>>
>>>>> On Fri, Oct 4, 2019 at 1:19 AM CARLOS JESUS BERNARDOS CANO <
>>>>> cjbc@it.uc3m.es> wrote:
>>>>>
>>>>>> Hi Paul,
>>>>>>
>>>>>> Thanks for the revision. I'll review the document and let you know
>>>>>> about next steps.
>>>>>>
>>>>>> Carlos
>>>>>>
>>>>>> On Thu, Oct 3, 2019 at 12:12 PM Mr. Jaehoon Paul Jeong <
>>>>>> jaehoon.paul@gmail.com> wrote:
>>>>>>
>>>>>>> Hi Russ and Carlos,
>>>>>>> I have submitted the revision (-12) of IPWAVE PS draft as you know.
>>>>>>> https://tools.ietf.org/html/draft-ietf-ipwave-vehicular-networking-12
>>>>>>>
>>>>>>>
>>>>>>> Will you review the revision and move forward to the WGLC or wait
>>>>>>> for Charlie's another review?
>>>>>>>
>>>>>>> BTW, my SKKU team are working for IETF-106 IPWAVE Hackathon Project
>>>>>>> to show the data delivery
>>>>>>> between two 802.11-OCB embedded systems such as the text and
>>>>>>> web-camera video.
>>>>>>> We will work to demonstrate the IPv6 over 802.11-OCB.
>>>>>>> This is a collaboration work with Hyundai Motors.
>>>>>>>
>>>>>>> Thanks.
>>>>>>>
>>>>>>> Best Regards,
>>>>>>> Paul
>>>>>>>
>>>>>>> ---------- Forwarded message ---------
>>>>>>> From: Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
>>>>>>> Date: Thu, Oct 3, 2019 at 6:57 PM
>>>>>>> Subject: Re: [ipwave] Some review comments for
>>>>>>> draft-ietf-ipwave-vehicular-networking-11
>>>>>>> To: Charlie Perkins <charles.perkins@earthlink.net>
>>>>>>> Cc: its@ietf.org <its@ietf.org>rg>, Sandra Cespedes <
>>>>>>> scespedes@ing.uchile.cl>gt;, <skku-iotlab-members@skku.edu>du>, Mr.
>>>>>>> Jaehoon Paul Jeong <jaehoon.paul@gmail.com>
>>>>>>>
>>>>>>>
>>>>>>> Hi Charlie,
>>>>>>> I have addressed your comments below and your editorial changes,
>>>>>>> submitting the revision:
>>>>>>> https://tools.ietf.org/html/draft-ietf-ipwave-vehicular-networking-12
>>>>>>>
>>>>>>>
>>>>>>> Also, I addressed Sandra's comments about the definition of an RSU
>>>>>>> as an edge computing system
>>>>>>> having multiple routers and servers (including DNS server), as shown
>>>>>>> in Figure 2.
>>>>>>>
>>>>>>> I attach the revision letter for your double-checking.
>>>>>>>
>>>>>>> Thanks for your valuable and constructive comments.
>>>>>>>
>>>>>>> Best Regards,
>>>>>>> Paul
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Sep 16, 2019 at 1:08 PM Charlie Perkins <
>>>>>>> charles.perkins@earthlink.net> wrote:
>>>>>>>
>>>>>>>> Hello folks,
>>>>>>>>
>>>>>>>> I made a review of the document
>>>>>>>> draft-ietf-ipwave-vehicular-networking-11.txt.  Besides editorial
>>>>>>>> comments, I had some other more substantive comments on the
>>>>>>>> document, as
>>>>>>>> follows.
>>>>>>>>
>>>>>>>> First, I thought that the document should contain an easily
>>>>>>>> identifiable
>>>>>>>> problem statement.  Here is some text that I devised for that
>>>>>>>> purpose,
>>>>>>>> which could fit naturally at the beginning of Section 5.
>>>>>>>>
>>>>>>>>     In order to specify protocols using the abovementioned
>>>>>>>> architecture
>>>>>>>>     for VANETs, IPv6 core protocols have to be adapted to overcome
>>>>>>>> certain
>>>>>>>>     challenging aspects of vehicular networking.  Since the
>>>>>>>> vehicles are
>>>>>>>>     likely to be moving at great speed, protocol exchanges need to
>>>>>>>> be
>>>>>>>>     completed in a time relatively small compared to the lifetime
>>>>>>>> of a
>>>>>>>>     link between a vehicle and an RSU, or between two vehicles.
>>>>>>>> This
>>>>>>>>     has a major impact on IPv6 neighbor discovery. Mobility
>>>>>>>> management
>>>>>>>>     is also vulnerable to disconnections that occur before the
>>>>>>>> completion
>>>>>>>>     of identify verification and tunnel management.  This is
>>>>>>>> especially
>>>>>>>>     true given the unreliable nature of wireless communications.
>>>>>>>> Finally,
>>>>>>>>     and perhaps most importantly, proper authorization for
>>>>>>>> vehicular
>>>>>>>> protocol
>>>>>>>>     messages must be assured in order to prevent false reports of
>>>>>>>> accidents
>>>>>>>>     or other mishaps on the road, which would cause horrific misery
>>>>>>>> in
>>>>>>>>     modern urban environments.
>>>>>>>>
>>>>>>>> ----------------------------------------------
>>>>>>>>
>>>>>>>> Although geographic routing is mentioned early in the document, it
>>>>>>>> is
>>>>>>>> not discussed in later sections.  This makes me wonder whether the
>>>>>>>> early
>>>>>>>> mention is really relevant.  In fact, for fast moving objects, I
>>>>>>>> think
>>>>>>>> it is already questionable whether geographic routing has value.
>>>>>>>> For
>>>>>>>> the RSUs, it is a lot easier to imagine a good use for geographic
>>>>>>>> routing, or perhaps some other use of geographic information to
>>>>>>>> establish links between application endpoints.  If geographic
>>>>>>>> algorithms
>>>>>>>> are mentioned at all, a lot more development is needed to establish
>>>>>>>> relevance to the problem statement.
>>>>>>>>
>>>>>>>> ---------------------------------------------
>>>>>>>>
>>>>>>>> More description is needed for OCB in the Terminology section. It
>>>>>>>> would
>>>>>>>> also be a good idea to include definitions for "context-aware" and
>>>>>>>> for
>>>>>>>> platooning.
>>>>>>>>
>>>>>>>> class-based safety plan needs a definition and a list of classes.
>>>>>>>>
>>>>>>>> ---------------------------------------------
>>>>>>>>
>>>>>>>> As a general comment, it seems to me that a proposed architecture
>>>>>>>> is
>>>>>>>> usually considered to be part of the solution, not the problem
>>>>>>>> statement.  In the case of this document, the architecture is
>>>>>>>> really a
>>>>>>>> depiction of IPv6 as it might be normally considered to live in a
>>>>>>>> multi-network deployment (e.g., between a lot of cars and RSUs).
>>>>>>>> But
>>>>>>>> anyway some care has to be taken so that the proposed architecture
>>>>>>>> doesn't otherwise place strong limits on acceptable solutions.  So,
>>>>>>>> for
>>>>>>>> example, in section 4.1, it needs to be clear whether or not a
>>>>>>>> single
>>>>>>>> subnet prefix can span multiple vehicles.  This is an important
>>>>>>>> choice.
>>>>>>>>
>>>>>>>> ---------------------------------------------
>>>>>>>>
>>>>>>>> In section 5.1.1., a claim is made that a new link model is
>>>>>>>> required.  I
>>>>>>>> think this is a very ambitious claim, and I am not even quite sure
>>>>>>>> what
>>>>>>>> is meant.  IPv6 already provides for "on-link" and "off-link"
>>>>>>>> variations
>>>>>>>> on subnet operation.  Unless I am missing something here, the claim
>>>>>>>> should be made much more clear (or else retracted).
>>>>>>>>
>>>>>>>> Similarly, the suggestion that VANETs need to be merging and
>>>>>>>> partitioning as part of the problem statement seems at least
>>>>>>>> ambitious
>>>>>>>> and might present a very high bar that could disqualify otherwise
>>>>>>>> suitable solutions.
>>>>>>>>
>>>>>>>> ---------------------------------------------
>>>>>>>>
>>>>>>>> It would be nice to have a citation about why current
>>>>>>>> implementations of
>>>>>>>> address pseudonyms are insufficient for the purposes described in
>>>>>>>> section 5.1.2.
>>>>>>>>
>>>>>>>> ---------------------------------------------
>>>>>>>>
>>>>>>>> It seems to me that the discussion in section 5.1.3 lives almost
>>>>>>>> entirely in solution space.
>>>>>>>>
>>>>>>>> ---------------------------------------------
>>>>>>>>
>>>>>>>> In section 5.1.4, it was not clear to me about why Neighbor
>>>>>>>> Discovery
>>>>>>>> really needs to be extended into being a routing protocol.
>>>>>>>>
>>>>>>>> --------------------------------------------
>>>>>>>>
>>>>>>>> It seems to me that section 5.3 really belongs in section 6. Also,
>>>>>>>> even
>>>>>>>> a perfectly authorized and legitimate vehicle might be persuaded
>>>>>>>> somehow
>>>>>>>> to run malicious applications.  I think that this point is not
>>>>>>>> sufficiently covered in the current text.
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Charlie P.
>>>>>>>> Blue Sky Networks
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> its mailing list
>>>>>>>> its@ietf.org
>>>>>>>> https://www.ietf.org/mailman/listinfo/its
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> ===========================
>>>>>>> Mr. Jaehoon (Paul) Jeong, Ph.D.
>>>>>>> Associate Professor
>>>>>>> Department of Software
>>>>>>> Sungkyunkwan University
>>>>>>> Office: +82-31-299-4957
>>>>>>> Email: jaehoon.paul@gmail.com, pauljeong@skku.edu
>>>>>>> Personal Homepage: http://iotlab.skku.edu/people-jaehoon-jeong.php
>>>>>>> <http://cpslab.skku.edu/people-jaehoon-jeong.php>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> ===========================
>>>>>>> Mr. Jaehoon (Paul) Jeong, Ph.D.
>>>>>>> Associate Professor
>>>>>>> Department of Software
>>>>>>> Sungkyunkwan University
>>>>>>> Office: +82-31-299-4957
>>>>>>> Email: jaehoon.paul@gmail.com, pauljeong@skku.edu
>>>>>>> Personal Homepage: http://iotlab.skku.edu/people-jaehoon-jeong.php
>>>>>>> <http://cpslab.skku.edu/people-jaehoon-jeong.php>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Special Issue "Beyond 5G Evolution":
>>>>>> https://www.mdpi.com/journal/electronics/special_issues/beyond_5g
>>>>>>
>>>>>>
>>>>>
>>>>> --
>>>>> ===========================
>>>>> Mr. Jaehoon (Paul) Jeong, Ph.D.
>>>>> Associate Professor
>>>>> Department of Software
>>>>> Sungkyunkwan University
>>>>> Office: +82-31-299-4957
>>>>> Email: jaehoon.paul@gmail.com, pauljeong@skku.edu
>>>>> Personal Homepage: http://iotlab.skku.edu/people-jaehoon-jeong.php
>>>>> <http://cpslab.skku.edu/people-jaehoon-jeong.php>
>>>>>
>>>>
>>>>
>>>> --
>>>> Special Issue "Beyond 5G Evolution":
>>>> https://www.mdpi.com/journal/electronics/special_issues/beyond_5g
>>>>
>>>>
>>>
>>> --
>>> ===========================
>>> Mr. Jaehoon (Paul) Jeong, Ph.D.
>>> Associate Professor
>>> Department of Software
>>> Sungkyunkwan University
>>> Office: +82-31-299-4957
>>> Email: jaehoon.paul@gmail.com, pauljeong@skku.edu
>>> Personal Homepage: http://iotlab.skku.edu/people-jaehoon-jeong.php
>>> <http://cpslab.skku.edu/people-jaehoon-jeong.php>
>>>
>> --
>> Sent from a mobile device, please excuse any brevity or typing errors.
>>
>
>