Subject: RE: [Pana] Mobility Handling in PANA

From: Giaretta Gerardo <[email-masked]>
Date: Mon, 12 Jul 2004 13:29:32 +0200

Hi Yoshi, Julien,

just one more comment. See inline..

> > [2] I think it is also possible to run the MN-AR context transfer 
> > protocol to carry CTAR messages between MN and nPAA (or 
> pPAA) instead 
> > of piggybacking CTAR messages in PANA messages.  For 
> example something 
> > like this in the case of non-predictive mode:
> > 
> >    PaC           nPAA              pPAA
> >    ----------------------------------------
> >          CTAR 
> >    --------------->       CT-Request 
> >                         ------------>
> >                              CTD 
> >                         <------------
> > 
> >          PSR
> >    <---------------
> >     PSA[old Session-ID, Nonce]   // MAC AVP is not needed.
> >     --------------->
> >     PBR[new Session-ID, Key-Id, Nonce, PPAC, MAC]
> >    <-------------
> >     PBA[new Session-ID, Key-Id, PPAC, MAC]
> >     ------------->
> > 
> > This has half round-trip redundancy compared to your 
> proposal (due to 
> > non-piggybacking CTAR), but provides better modularity between PANA 
> > and Context Transfer Protocol.  Also this works with both 
> > non-predictive and predictive modes.
> 
> The problem in this case is that the nEP will detect the CTAR 
> message and trigger a PANA authentication message. This means 
> that in the same time, we will have a PSR/PSA exchange and 
> CT-Request/CTD. We can't decorrelate PANA and CTP.
> 
> In my mind, when the pana module at pac receives a psr 
> message it asks the ctp module to provide the CTAR message. 
> Thus we keep the modularity.
> 

Moreover, the nEP usually does not allow ICMP (i.e. CTAR) packets for
unauthorized PaC. 
Therefore, in non-predictive case, I think that the message exchange
provided by Yoshi does not work. The nEP blocks the CTAR message and
triggers PANA authentication: in this way CTP and PANA, as Julien
pointed out, are decorrelated and no optimizations are possible.

--Gerardo  

Gruppo Telecom Italia - Direzione e coordinamento di Telecom Italia S.p.A.

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