Re: : Change to "Reply-Message AVP" usage in Diameter EAP

It looks like we'll have a bad situation in any case, no
matter what we decide to do in this AUTH48. I'm inclined
to believe Pasi and Yoshi in that some kind of new
NAS functionality makes messages like this possible
in the future, and that the AAA servers are smart enough
to decide what to do based on the context.

However, if we allow messages in Diameter EAP, this
will immediately create a problem for Diameter - Radius
translation, and will also create a need for updating
RFC 3579. In the meantime some NASes will be throwing
away the message that the AAA server wanted to display.
If on the other hand we keep the RFC 3579 approach
in Diameter EAP, then we are not providing this
potentially useful function. More importantly, we are
mandating that NASes ignore the AVP, which makes
introducing the feature later hard.

Perhaps one way to look at this would be to align
RADIUS and Diameter EAP according to the
scheme in RFC 3579 now, and later develop a new mini
RFC that describes how Reply-Message is to be
used (for both RADIUS&Diameter).  Or the mini
RFC could be a part of Avi's PANA AAA document.

--Jari