Subject: RE: [Pana] A new PAA discovery scheme in multi-hop PANA

From: Gerardo Giaretta <[email-masked]>
Date: Fri, 18 Mar 2005 10:49:21 +0100

> 
> Hi Junghoon,
> 
> and thanks for bringing up the details of the discovery scheme.
> I have a few questions, however:
> 
> >Here is a short description of a new PAA discovery scheme in 
> the multi-hop PANA environment.
> >
> >+ New PANA discovery message for locating PAA 
> >    - Use of anycast message
> >    - Seed information to look up the specific PAA : network 
> prefix of PAA
> >   - Steps  
> >         * PaC sends an anycast PANA discovery message using 
> the home network prefix to its home PAA domain.
> >         * A PAA responds to it with a PANA-start-request 
> (PSR) message.  
> >         * The MN responds with a PANA-start-answer (PSA) 
> message to the PAA. 
> >
> >As you expect, this scheme requires the pre-configuration of 
> PAA's network prefix to the PaC.
> >
> What's a "home PAA domain"? Presumably PANA is used for 
> network access (even
> when you run it in multi-hop mode). This would seem to imply that
> depending on
> where you are, you get a different PAA. So why would we need to send
> something
> to a ?home PAA"? Or is your idea that you send a message towards the
> home PAA,
> and then the local PAA captures that on the path, and starts 
> doing PANA with
> you?
> 
> How about having a fixed anycast address for "local PAAs", or a DHCP
> option for discovering a PAA and that there is a need for PAA? Or a
> solution that is triggered by an attempt to send packets. The DHCP
> solution has worked well for DNS discovery.
> 

PAA discovery based on the attempt to send packets is already in the
spec and can work also in multi-hop scenario. The EP drops unauthorized
PaC packets and triggers the PAA for the authentication. This requires
that the EP is pre-configured with PAA(s) address(es) but I guess this
is not a critical point.

--Gerardo

> --Jari
> 
> 
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> 

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

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