Re: [DNA] QUESTION: Remove Link Down information indraft-ietf-dna-link-information-03

[Yoshihiro Ohba <yohba@tari.toshiba.com>]

Security of link layer indications would heavily depend on the link
layer security characteristics.  I'd say that any link-layer
indication generated as a result of receipt of unprotected link-layer
frames is an issue even if IEEE 802.21 is used.  On the other hand, if
indications are generated as a result of receipt of protected
link-layer frames, then the indications can be useful even if 802.21
is not used.  

802.21 also supports remote delivery of link layer indications using
MIHF (Medie-Independent Handover Function) protocol.  This remote
delivery needs to be proteced by MIHF protocol transport.

BTW, there was a tutorial on IEEE 802.21 in IEEE 802 plenary yesterday
and the slides are available at:

http://www.ieee802.org/21/doctree/2006-07_meeting_docs/802%2021-IEEE-Tutorial.ppt

Hope this helps,
Yoshihiro Ohba


On Wed, Jul 19, 2006 at 12:53:57PM -0700, James Kempf wrote:
> Yoshi,
> 
> What kind of security is on this?
> 
>            jak
> 
> ----- Original Message ----- 
> From: "Yoshihiro Ohba" <yohba@tari.toshiba.com>
> To: "James Kempf" <kempf@docomolabs-usa.com>
> Cc: <suresh.krishnan@ericsson.com>; "Dna" <dna@eng.monash.edu.au>; "greg 
> Daley" <gregd@research.panasonic.com>; "Bernard Aboba" 
> <aboba@internaut.com>; "Jari Arkko (JO/LMF)" <jari.arkko@ericsson.com>; 
> "Alper Yegin" <alper.yegin@yegin.org>
> Sent: Wednesday, July 19, 2006 10:08 AM
> Subject: Re: [DNA] QUESTION: Remove Link Down information in 
> draft-ietf-dna-link-information-03
> 
> 
> >FYI, IEEE 802.21 defines link down indication, but with more detailed
> >information on why the indication has been generated.  Depending on
> >the detailed information the receiver of the indication is allowed to
> >take different actions including silent discarding the indication.  It
> >may be possible to define more sophisticated indications in a future.
> >My personal opinion is that it sounds premature to conclude that link
> >down indication is harmful in general.
> >
> >Yoshihiro Ohba
> >
> >
> >On Tue, Jul 18, 2006 at 09:18:49AM -0700, James Kempf wrote:
> >>I'm fine with this. The history of Link Down in IETF is that nobody has
> >>ever figured out a way to allow it to be done securely. I hope that we 
> >>can
> >>record this somewhere (maybe an RFC "Link Down Considered Harmful"? from
> >>the IAB) so people stop wasting time on it.
> >>
> >>           jak
> >>
> >>----- Original Message ----- 
> >>From: "Suresh Krishnan" <suresh.krishnan@ericsson.ca>
> >>To: "Dna" <dna@eng.monash.edu.au>
> >>Cc: "greg Daley" <gregd@research.panasonic.com>; "Bernard Aboba"
> >><aboba@internaut.com>; "Jari Arkko (JO/LMF)" <jari.arkko@ericsson.com>;
> >>"Alper Yegin" <alper.yegin@yegin.org>
> >>Sent: Monday, July 17, 2006 3:57 PM
> >>Subject: [DNA] QUESTION: Remove Link Down information in
> >>draft-ietf-dna-link-information-03
> >>
> >>
> >>>Hi Folks,
> >>>  In its current form draft-ietf-dna-link-information-03 provides
> >>>information about both link up and link down events. There were some
> >>>concerns raised about the presence of link down events in this document,
> >>>since DNA does not necessarily use the link down event. So instead of
> >>>spending time to understand how to treat this event in this WG, one
> >>>proposed solution was to remove link down related info from this 
> >>>document
> >>>and let other wgs(perhaps future ones) work on it. If you have any
> >>>opposition to this solution please respond to the mailing list by the 
> >>>24th
> >>>of July 2006 stating your objection.
> >>>
> >>>Cheers
> >>>Suresh and Greg
> >>>
> >>
> >>
> >>
> >
> 
> 
>