Re: [Mobopts] Re: draft-irtf-mobopts-l2-abstractions-04.txt comments

Hi Jari,
could we close this one? We could then send the revised ID for publication.

Thanks,

-Rajeev

On Jan 14, 2008 7:32 AM, Fumio Teraoka <tera@ics.keio.ac.jp> wrote:

> Jari,
>
> Thanks for comments. Replies are inline:
>
> At 08/01/09 15:36 +0200, Jari Arkko wrote:
> (snip)
>
> >> We modified the document as follows:
> >>
> >> - Sec. 4.5 L2-LinkUp (Type 2):
> >>   - old: The L2-LinkUp.indication primitive is asynchronously provided
> to
> >>          an upper layer when a new link is connected.
> >>
> >>   - new: The L2-LinkUp.indication primitive is asynchronously provided
> to
> >>          an upper layer when a new link is connected and IP packets can
> be
> >>          transmitted through the new link. As described in RFC 4957[7],
> >>          what "link is connected" means depends on link types.
> >
> >Good.
> >
> >>  For example,
> >>          in case of the infrastructure mode in IEEE802.11 (WiFi), this
> >>          primitive is provided when an association to an access point
> is
> >>          established.
> >>
> >
> >Really? I was under the impression that association was an early phase
> >and you would need to wait for something else if security was applied. I
> >could be mistaken, but this discussion is an example of the sort of
> >detail level that a fully defined interface would have to go to.
>
> In my understanding of the IEEE802.11 infrastructure mode, at first,
> a mobile node is in Unauthenticated & Unassociated State. Next,
> the mobile node is authenticated and then the state changes to
> Authenticated & Unassociated State. Finally, an association is
> established with the AP and then the state changes to Authenticated
> and Associated state. Thus, we defined that L2-LinkUp is provided
> when an association is established in WiFi.
>
> (snip)
>
> >> The quality levels of a device are independent of those of other
> devices.
> >> We added sentences at the last of "Sec. 6.2 Condition" as follows:
> >>
> >>   The quality levels of a L2 device are independent of those of other
> >>   devices.  An example of the thresholds among the five levels are
> described
> >>   in Appendix E.
> >>
> >> We also added the description about the example thresholds in Appendix
> E.
> >>
> >
> >The added text is good, but I'm still not convinced that you have a
> >generic solution capable of operating in different conditions. It might
> >be more useful to simply acknowledge that making decisions based on
> >these metrics is error prone and not guaranteed to result in optimal
> >choice of links.
>
> I agree that "decisions based on these metrics is error prone and
> not guaranteed to result in optimal choice of links."
> I'll attend this sentence at the last of "6.2 Condition".
>
> (snip)
>
> Best Regards,
>
> Fumio Teraoka
>
>
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