Re: [16NG] Re: multicast and IPv6 over ETHCS

Is there a real case that PPP/PPPoE is overlaid on top PDP or PPP (PDSN
case) or LAP? My guess is that No, i haven't seen a DIALer that does this
and there is no reason to do so. There is case that PC PPP to the AT though
but this terminates at the AT

On 1/17/07, Basavaraj Patil <basavaraj.patil@nokia.com> wrote:
>
>
> Alex,
>
>
> On 1/17/07 11:29 AM, "ext Alexandru Petrescu"
> <alexandru.petrescu@motorola.com> wrote:
>
> > Basavaraj Patil wrote:
> >> Alex,
> >>
> >> Again a comment on just one of your statements:
> >>
> >>
> >> On 1/17/07 11:04 AM, "ext Alexandru Petrescu"
> >> <alexandru.petrescu@motorola.com> wrote:
> >>
> >>> And I'm asking this because ppp is used everywhere on GPRS/UMTS,
> >>> and pppoe is used on some HSDPA.
> >>
> >> PPP is NOT used in GPRS/UMTS or HSDPA.
> >
> > How do you know?  I know because I've tried.  It's always the pppd
> > program and ConfigReq sent/received.
>
> The PPP that you are talking about is most likely not between your PC card
> (that is implementing GPRS/HSDPA) and the GGSN. You could be doing PPP
> over
> a PDP context that is established between the PC card and the GGSN.
> Question
> is, does the PPP terminate at the GGSN? Of course not knowing what kind of
> service you are using or details, I can only speculate.
>
> >
> > Do you mean a SDO spec says that PDP context is set up?  And that that
> > SDO document doesn't say 'ppp is used'?  I agree with this part.
>
> PPP is an overhead and not required to transport IP packets in GPRS. PDP
> contexts are the mechanism used for carrying IP packets.
>
> >
> >> PPPoE is NOT used in GPRS/UMTS or HSDPA.
> >
> > What do you call a PPP ConfigReq within a MAC header with 48bits
> > addresses, as displayed by Ethereal?  And with a pcmcia card saying
> hsdpa.
>
> Your Ethereal may not really be have the drivers to read what is being
> sent
> by the HSDPA card... I don't know. As I said above, tell me where is PPP
> being terminated in the network, i.e the GPRS core?
>
> >
> >> PDP context != PPP or PPPoE
> >
> > I'm sorry.  PDP context is not something defined at IETF, a different
> > beast, can't compare.
>
> And I am not asking you to do so. I was just correcting a statement about
> PPP usage that you made. And it appeared to be a globally applicable
> statement to all GPRS/UMTS/HSDPA deployments.
>
> -Raj
>
> >
> > Alex
> >
>
>
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