Re: [DNA-BOF] Using L2 to provide Instantaneous Movement

[Nicolas Montavont <montavont@clarinet.u-strasbg.fr>]

Bernard Aboba wrote:

 >>Right. I think there are two different ways to use L2 frames: to decide
 >>and anticipate movement, and on the other hand to enhance new link
 >>detection. In our draft, we focus on the new link detection and we
 >>consider (Re) Association Response as Link Up hint. At this point
 >>(association procedure), information on the MN about SSID and BSSID can
 >>be trusted.
 >>
 >>
 >
 >Reassociation Response is *not* a "link up" hint in IEEE 802.11i, and
 >interpretting it as such causes major malfunctions.  In IEEE 802.11i the
 >link is not up until completion of the security negotiation (4-way
 >handshake).  Bringing the link up beforehand causes outgoing packets to be
 >dropped, so that the host will attempt reachability detection, will get no
 >answer and will then assume it is on the different subnet when this is not
 >the case.  Similarly, TCP will assume that an entire window of packets has
 >been dropped and will go into slow-start.
 >
Thank you for this clarification. I didn't take into accuont 802.11i
when writing the draft.
I will add change to the draft.

Nicolas