Re: [ipwave] I-D Action: draft-ietf-ipwave-ipv6-over-80211ocb-51.txt

[Alexandre Petrescu <[e-mail]>]

Thanks for the new version!

I have some comments from the earlier versions, so I think it
is time I put them now on the list.

I wonder whether you think addressing these comments are necessary now,
or I can send them later, maybe after some more thought?

Anyways, here are the comments:
> but operates over 802.11-OCB to provide at least P2P (Point to Point)
> connectivity using IPv6 ND and link-local addresses.

802.11-OCB is not a point-to-point link and nobody used it as such.  I
think the writer of this text has a completely different understanding
than me, about what is a point-to-point link.  For me, a point-to-point
link is typically a cellular link, not an 802.11 link.  A more tangible
differentiator is the absence of MAC addresses most of the time.

> The link model is the following: STA --- 802.11-OCB --- STA.  In 
> vehicular networks, STAs can be IP-RSUs and/or IP-OBUs.  All links 
> are assumed to be P2P and multiple links can be on one radio 
> interface.

Nobody assumes the 802.11-OCB to be P2P (point-to-point) links; for my
part, I never linked multiple links on one radio interface.  I do not
understand what the writer of this text meant.

> IPv6 Neighbor Discovery protocol (ND) requires reflexive properties 
> (bidirectional connectivity) which is generally, though not always, 
> the case for P2P OCB links.

I do not understand what is meant by P2P OCB links?

> [Abstract:] Support for these methods and settings require minimal 
> changes to existing stacks.

> [Section 4.2 Frame Format:] The mapping to the 802.11 data service 
> SHOULD use a 'priority' value of 1 (QoS with a 'Background' user 
> priority),

These two paragraphs seem contradictory.  Because making QoS
'Background' priority requires the use of 802.11 QoS Data headers which
are not available in existing stacks.  For my part I did not see stacks
that do QoS Data headers.  SO adding QoS Data headers requires much
changes to existing stacks.

(note: I do like and agree with the way in which 'minimal changes' is
formulated and added for the draft).

(note: I did see QoS Data headers but never seen the stacks that send them).

Alex

Le 25/07/2019 à 15:46, [e-mail] a écrit :
> 
> A New Internet-Draft is available from the on-line Internet-Drafts 
> directories. This draft is a work item of the IP Wireless Access in 
> Vehicular Environments WG of the IETF.
> 
> Title           : Basic Support for IPv6 over IEEE Std 802.11 
> Networks Operating Outside the Context of a Basic Service Set
> Authors : Nabil Benamar Jerome Haerri Jong-Hyouk Lee Thierry Ernst
> Filename : draft-ietf-ipwave-ipv6-over-80211ocb-51.txt Pages : 31
> Date : 2019-07-25
> 
> Abstract: This document provides methods and settings, for using
> IPv6 to communicate among nodes within range of one another over a
> single IEEE 802.11-OCB link.  Support for these methods and settings
> require minimal changes to existing stacks.  This document also
> describes limitations associated with using these methods.
> Optimizations and usage of IPv6 over more complex scenarios is not
> covered in this specification and is subject of future work.
> 
> 
> The IETF datatracker status page for this draft is: 
> https://datatracker.ietf.org/doc/draft-ietf-ipwave-ipv6-over-80211ocb/
>
>
>
>
> 
There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-ipwave-ipv6-over-80211ocb-51 
> https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-ipv6-over-80211ocb-51
>
>
>
>
> 
A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-ipwave-ipv6-over-80211ocb-51
>
>
>
>
> 
> 
> Please note that it may take a couple of minutes from the time of 
> submission until the htmlized version and diff are available at 
> tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at: 
> ftp://ftp.ietf.org/internet-drafts/
> 
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