Let me further separate threads. This one issue is relatively standalone,
and orthogonal to the format re-structuring you are suggesting.

> >> As yet another simplification, what if you allowed any authenticated
> >> PANA message update the source IP/port? This would seem to be of
> >> considerable help to NAT traversal (e.g., if the PaC is issuing a
> >> periodic Ping). Also, it would mean that you don't have to define a
> >> specific message (e.g., the Ping, or reauth, etc. would all do the
> trick
> >> just fine).
> >>
> >
> > I'm thinking this implicit semantics may hurt us down the road. There
> may be
> > valid reasons to send messages with different source addresses in the
> > future. I think a dedicated and explicit message type is better.
> >
> If you allow messages to come from different source addresses for the
> same session, we are back to coordinating a context ID for the PANA
> session that is somehow unique across the administrative domain.

The session is still on the same PAA. PaC is the one changing address. 

I think you are referring to the case when we needed to globally unique
session identifiers. I don't see a need for such a thing in this case.

Alper




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