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

["Qiang Zhang" <qiangieee at gmail.com>]

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 at nokia.com> wrote:

Alex,


On 1/17/07 11:29 AM, "ext Alexandru Petrescu"
<alexandru.petrescu at 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 at 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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