Hi Mark:
On May 20, 2008, at 8:24 AM, Mark Townsley wrote:
>> - To your point on ND, this is precisely why the architecture draft
>> is so important. We haven't given it as much attention lately, but
>> it will help resolve the question your raise and many other
>> questions in the future. For example, the architecture draft
>> identifies two modes of operation: mesh-under and route-over. Both
>> of which may require different ND mechanisms. This doesn't apply to
>> just ND, but may apply questions of fragmentation, header
>> compression, security, etc.
> I worry about the under/over debate. It seems that with all the
> effort and enthusiasm in ROLL, we might be well-served at the moment
> by focusing on helping them be successful with route-over than
> spending too much of our time on route-under.
I worry too, especially since it will pull the WG in different
directions. I'm with you on the preference for route-over, but others
in this group feel strongly about mesh-under as well, especially since
ISA100.11a seems to have adopted a mesh-under approach. I've
personally been focused on developing route-over solutions while being
conscious of supporting mesh-under when possible (evident with 6lowpan-
hc). However, things will start to diverge when we start to talk about
bootstrapping, ND, etc. So we should make a conscious decision of
whether we're supporting one or both.
--
Jonathan Hui
>
>>
>> - I hesitate a bit that we suggest possible solutions to ND in the
>> charter ("reusing the 802.15.4 network structure (use the
>> coordinators)") especially since the definition of such link
>> mechanisms are still in motion within the IEEE. It seems more
>> productive to me if we can develop mechanisms that are less
>> dependent on the specific structure of 802.15.4 mechanisms.
> I agree that we should develop mechanisms that could work
> generically whenever possible.
>
> - Mark
>>
>> Rest of the charter looks good to me.
>>
>> Thanks.
>>
>> --
>> Jonathan Hui
>>
>>
>>
>> On May 16, 2008, at 11:46 AM, Mark Townsley wrote:
>>
>>> Pascal Thubert (pthubert) wrote:
>>>> Hi Mark:
>>>>
>>>> I think we need a work item (usually implicit) around the concept
>>>> of
>>>> improving existing WG RFCs. RFC 4944 can be improved in several
>>>> aspects:
>>>>
>>>
>>>>
>>>> - A major one is a better fit with ISA100.11a. Getting ISA100.11a
>>>> to
>>>> conform to 6LoWPAN would be a major win, but is certainly not a
>>>> given.
>>>> At the moment, the ISA100.11a documents expose discrepencies with
>>>> RFC
>>>> 4944 that http://www.tools.ietf.org/html/draft-hui-6lowpan-hc
>>>> resolve
>>>> for the most part.
>>>>
>>> Are the resolutions backwards compatible with RFC 4944? I'm eager to
>>> improve RFC 4944, but not eager to endorse changes that inhibit
>>> interoperability.
>>>> - The issue of fragmentation. Applying RFC 4944 over a multihop
>>>> radio
>>>> mesh exposes the network to congestion collapse, as described in
>>>> http://www.tools.ietf.org/html/draft-thubert-6lowpan-simple-fragment-rec
>>>> overy . I think that the WG should dedicate some bandwitdth to
>>>> provide
>>>> additional functions that would improve the LoWPAN operation WRT
>>>> flow
>>>> control and recovery of fragments.
>>>>
>>> Fragmentation, OK, but why is flow control a network layer issue
>>> rather
>>> than a transport layer issue?
>>>> Another aspect of ISA100.11a is the concept of a backbone router.
>>>> It
>>>> would be appropriate that the IETF comes up with a proposal to
>>>> implement
>>>> the concept in the IPv6 world. This partially falls under the
>>>> first work
>>>> item on ND but might also include ND proxy over the backbone
>>>> which is a
>>>> stretch to the work item. More in
>>>> http://www.tools.ietf.org/html/draft-thubert-6lowpan-backbone-router
>>>> .
>>>>
>>> Well, don't we need to define what ND looks like on a lowpan
>>> before we
>>> decide whether it needs to be proxied or not?
>>>
>>> - Mark
>>>> What do you think?
>>>>
>>>> Pascal
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
>>>>> On
>>>>>
>>>> Behalf Of Mark Townsley
>>>>
>>>>> (townsley)
>>>>> Sent: jeudi 15 mai 2008 23:02
>>>>> To: 6lowpan@ietf.org
>>>>> Subject: [6lowpan] New charter for 6lowpan
>>>>>
>>>>>
>>>>> I'd like to ask the group one final time for comments on the
>>>>> proposed
>>>>> new charter. I've also asked the ROLL WG chairs to comment.
>>>>>
>>>>> As I said before, soon after the format document was published,
>>>>> there
>>>>>
>>>> is
>>>>
>>>>> nothing stopping the WG from discussing and working on new and
>>>>> existing
>>>>> items at this time. In fact, activity helps us to decide what
>>>>> should be
>>>>> in and out of the charter. Please do not construe not having a
>>>>> charter
>>>>> in place as a reason not to update drafts, or discuss topics
>>>>> that need
>>>>> to be discussed. Just as when we have BoF's and mailing lists
>>>>> before
>>>>> creating a new WG, it is good to have WG meetings and on-lists
>>>>> discussions when creating new WG charters.
>>>>>
>>>>> - Mark
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>> _______________________________________________
>>> 6lowpan mailing list
>>> 6lowpan@ietf.org
>>> https://www.ietf.org/mailman/listinfo/6lowpan
>>
>>
>
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