Help - Auto PPPoA and PPPoE detection in ADSL line

Help - Auto PPPoA and PPPoE detection in ADSL line

[Ranjeet Kumar - R&D]

Hi, 

I am new in this group, if anything is wrong, please excuse me in advance.

We have ADSL modem running Linux Version - 2.4 and pppd version 2.4.1. We
want to detect the protocol, whether it is PPPoE or PPPoA, of the connected
ADSL line. Can anybody help me in providing information on how to achieve
this task? We are using pppoe and pppoa plugin with pppd to connect to DSLAM
(ISP).

Really, appreciate the any help!

Regards,
Ranjeet

Re: Help - Auto PPPoA and PPPoE detection in ADSL line

[Arvin Schnell]

On Thu, Jun 16, 2005 at 03:09:04PM +0800, Ranjeet Kumar - R&D wrote:
> Hi, 
> 
> I am new in this group, if anything is wrong, please excuse me in advance.
> 
> We have ADSL modem running Linux Version - 2.4 and pppd version 2.4.1. We
> want to detect the protocol, whether it is PPPoE or PPPoA, of the connected
> ADSL line. Can anybody help me in providing information on how to achieve
> this task? We are using pppoe and pppoa plugin with pppd to connect to DSLAM
> (ISP).

Detecting of PPPoE is easy: Send a PADI and see if you receive a
PADO.

This can be done with 'pppoe -A' included in the rp-pppoe source
or you can also write your one code.

I do not have experiences with PPPoA.

ciao Arvin

Re: Help - Auto PPPoA and PPPoE detection in ADSL line

[Marco d'Itri]

On Jun 16, Ranjeet Kumar - R&D <Ranjeet.Kumar@aztech.com> wrote:

> We have ADSL modem running Linux Version - 2.4 and pppd version 2.4.1. We
> want to detect the protocol, whether it is PPPoE or PPPoA, of the connected
> ADSL line. Can anybody help me in providing information on how to achieve
> this task? We are using pppoe and pppoa plugin with pppd to connect to DSLAM
> (ISP).
The PPP book by James Carlson explains how to do it.
OTOH it's probably better to implement this in a standalone application
than in pppd.

-- 
ciao,
Marco

Re: Help - Auto PPPoA and PPPoE detection in ADSL line

[Marco d'Itri]

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On Jun 16, Arvin Schnell <arvin@suse.de> wrote:

> Detecting of PPPoE is easy: Send a PADI and see if you receive a
> PADO.
This is not enough, you also need to account for the presence (or not)
of LLC/SNAP encapsulation.

-- 
ciao,
Marco

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Re: Help - Auto PPPoA and PPPoE detection in ADSL line

[James Carlson]

Marco d'Itri writes:
> On Jun 16, Ranjeet Kumar - R&D <Ranjeet.Kumar@aztech.com> wrote:
> 
> > We have ADSL modem running Linux Version - 2.4 and pppd version 2.4.1. We
> > want to detect the protocol, whether it is PPPoE or PPPoA, of the connected
> > ADSL line. Can anybody help me in providing information on how to achieve
> > this task? We are using pppoe and pppoa plugin with pppd to connect to DSLAM
> > (ISP).
> The PPP book by James Carlson explains how to do it.

Actually, I just discuss regular sync detection methods.  Methods on
ATM _should_ be similar in concept, but aren't described there.

> OTOH it's probably better to implement this in a standalone application
> than in pppd.

I agree with that.

-- 
James Carlson                                 <carlsonj@workingcode.com>