[Pana] Discovery and PCI (was RE: Message type reduction (AD comment))

["Alper Yegin" <alper.yegin at yegin.org>]

Here is another spin-off thread...

> >> 2. With a little bit of work, I think you could eliminate the need for
> >> the PCI and Pana-start messages. Using DHCP for discovery reduces the
> >> need for these messages. In fact, one of the many "optimizations"
> >> described here include carrying EAP directly in these messages,
> >> existence proof that you don't need to provide your own handshake
> before
> >> encapsulating EAP.
> >>
> >
> > I couldn't understand how DHCP helps. PCI is needed to let PaC trigger
> the
> > PANA exchange. And the reason for a dedicated PSR is the aforementioned
> > design choice.
> >
> DHCP helps you to discover the PAA. Once you know the PAA, then you can
> immediately send it an EAP message as a payload. The fact that the EAP
> payload can be carried on your first PANA message effectively proves this.

Once the PaC discovers the PAA via DHCP, it can send a message (PCI) to the
PAA. But that message cannot carry any EAP payload, as EAP must be initiated
by the PAA per RFC 3748. 

As for the need for PANA-Start, that goes back to your format re-structuring
suggestion. I'd like to think more about it.

Alper








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