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Re: [lwip-users] Help with PPP connection - modem disconnects for no obv

From: Sylvain Rochet
Subject: Re: [lwip-users] Help with PPP connection - modem disconnects for no obvious reason...
Date: Wed, 20 Mar 2019 18:48:29 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

Hi Patrick,

On Wed, Mar 20, 2019 at 01:20:02PM -0400, Patrick Klos wrote:
> For whatever reason, you're not responding to the CHAP challenges.
> Are you dialing into an ISP (which would require authentication) or into
> another system configured to be a "server"?  Either way, the peer is
> expecting you to have a username and password of some kind, but you're not
> responding to their challenges.

Well, that's just PPP to a cellular modem, PPP link is only between the 
device and the cellular modem to de/serialize IP packets on a serial 
link. That's why authentication is never required, cellular modems 
usually add some kind of fake authentication to support PPP clients 
where authentication can't be disabled.

> Also, what version of LwIP are you using?  I can't find some of these debug
> strings (like "CHAP Challenge") in my (2.1.2) sources. And are you sure all
> your modules were compiled with PPP_DEBUG defined as non-zero?

"CHAP Challenge" is from "CHAP" from chap_protent and "Challenge" from 

Debugging seem pretty well enabled, for once in a while I have no clue 
what is wrong here, usually it's straightforward from the trace but here 
it really isn't.


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