RE: [DNA] DNA link hints document

["Tero Kauppinen (JO/LMF)" <tero.kauppinen@ericsson.com>]

 -----Original Message-----
> From: owner-dna@ecselists.eng.monash.edu.au [mailto:owner-
> dna@ecselists.eng.monash.edu.au] On Behalf Of Bernard Aboba
> Sent: 3. marraskuuta 2004 8:35
> To: NJEDJOU Eric RD-RESA-REN
> Cc: Dna
> Subject: Re: [DNA] DNA link hints document
> 
> > Actually from an IP layer perspective on an MN, the GPRS link equals to
> > a ppp connection. Therefore activation of a PDP context is seen by an IP
> > node as the establishment of a ppp connection (because 3GPP specifies
> > that an IP node interfaces to the GPRS mobile station via PPP).
> 
> Actually, activation will express itself via completion of the PPP NCP
> negotiation.  Data may be sent after NCP negotiation is complete, so that
> is when the link can be considered "up" for IPv4.  For IPv6, I think that
> isn't true; RS/RA also needs to be  completed to enable address
> assignment.  Similarly, an LCP-terminate would bring the link "down" for
> any network protocol.

Actually, if I'm correct, the IPv6 address is acquired via the PDP context exchange. RAs are not sent to the terminal, for example, in the following scenario:

      LAPTOP <-- PPP --> PHONE <---- GPRS ----> GGSN

And the same is (obviously) true for UMTS as well...

BR,

Tero Kauppinen