[DNA] RE: IPv6 over PPP over GPRS -- once again

["Soliman, Hesham" <H.Soliman@flarion.com>]

Tero, 

I think RADIUS only comes into the picture if you're running 
PPP over the air. Are you? I thought it was only between the 
phone and laptop. But if you're running it over the air 
then it's a completely different story. 

Hesham

 > -----Original Message-----
 > From: Tero Kauppinen (JO/LMF) [mailto:tero.kauppinen@ericsson.com]
 > Sent: Wednesday, November 17, 2004 4:46 AM
 > To: Soliman, Hesham; Bernard Aboba
 > Cc: Dna
 > Subject: IPv6 over PPP over GPRS -- once again
 > 
 > 
 > >  > >  >       LAPTOP <-- PPP --> PHONE <---- GPRS ----> GGSN
 > >  > >  >
 > >  > >  > And the same is (obviously) true for UMTS as well...
 > >  > >
 > >  > > => The RAs are sent (at least according to the specs) 
 > but what you
 > >  > > might be seeing is that the RA is only sent to the 
 > phone and is not
 > >  > > forwarded to the laptop. So the laptop only sees a 
 > PPP connection.
 > >  >
 > >  > There is still the question of how the LAPTOP gets the IPv6
 > >  > prefix without
 > >  > RA.  Since PPP IPv6CP standards don't specify this, I'm 
 > at a loss to
 > >  > explain it.
 > > 
 > > => It doesn't get the prefix in this model.
 > > It can only get the prefix if PPP is not there. If, for instance,
 > > a bluetooth PAN profile is used, then it can get the prefix through
 > > an RA. The phone would be acting like a router in this case.
 > > 
 > > Hesham
 > 
 > I thought that there was something wrong with my setup and I 
 > came to the conclusion that RAs are indeed sent but I just 
 > couldn't see them. However, this was not a correct 
 > conclusion either. From the network administrators I learn 
 > that RAs never reach the phone because a firewall on their 
 > GPRS network side blocks them. I was indeed confused: no RAs 
 > and no option in PPP to negotiate a prefix and still the 
 > laptop had a global address. 
 > 
 > Took awhile to realize that there is a component missing 
 > from the picture and that is RADIUS (RADIUS and IPv6 -- 
 > rfc3162). Now the setup starts to make sense: the phone gets 
 > an address via a PDP context and it's delivered to the phone 
 > by using RADIUS. Does this sound reasonable or am I still in error?
 > 
 > BR,
 > 
 > Tero
 > 

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