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Re: [lwip-devel] PPP failure

From: su_list
Subject: Re: [lwip-devel] PPP failure
Date: Tue, 29 Jan 2008 22:26:22 -0800 (PST)



As I had mentioned, the issue is about consistency. When we dialup and setup
the ppp from one set of the mobile (Ex: Sony ericcsson 630), it works. The
below mentioned (logs) and the problem occurs only when, we use some
different set of mobiles (Ex: Sony ericcsson K750i).

Ya, I have tried dialing from the windows using its stack and i can connect
successfully to the ISP using the same mobile which is failing when I use it
with LWIP.

I am looking into the code, and I observe that the packet length varies and
is equal to NULL in the case of the failure. But am not understanding of how
the packet sent by ISP can vary in lengths.

Any insights?
(Log is attached in my first mail)


Jonathan Larmour wrote:
> su_list wrote:
>> PPP in LWIP is failing when I am trying to setup a link with a given ISP.
>> The point to note is, with some of the phones I can connect successfully
>> but
>> with some phones its failing regularly. I am using no-authentication in
>> PPP.
>> I am attaching the LWIP prints for the failure case below. Can someone
>> help
>> me debugging of why its failing in one phone and passing in the other.
> [snip]
>> ipcp: up
>> Could not determine remote IP address
> If this is true, this may mean the remote end is not configured with an IP
> address. You can't have both ends without configured IP addresses.
> http://books.google.com/books?id=oGn6mqsYHIIC&pg=PA262&lpg=PA262&dq=ppp+peer+address&source=web&ots=SWZdtSFbtY&sig=CzNU9qb26JbpSC4ujsGo8rkqAl4
> Have you tried using a different ppp stack? e.g. the one in Windows,
> linux,
> etc.
> Perhaps more likely is that it's some interoperability thing. Maybe some
> of
> the remote PPP servers are not standards-compliant, or there's some edge
> case which lwip's ppp stack doesn't consider.
> I think you may have to get your hands dirty in the code.
> Jfil
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