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Re: [lwip-users] Question about pppos sometimes fail to reach internet

From: Sylvain Rochet
Subject: Re: [lwip-users] Question about pppos sometimes fail to reach internet
Date: Sun, 19 Feb 2017 18:02:47 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

Hi Axel,

On Mon, Feb 20, 2017 at 12:40:47AM +0800, Axel Lin wrote:
> 2017-02-20 0:34 GMT+08:00 Sylvain Rochet <address@hidden>:
> >
> > It looks like your modem is not forwarding packets. Which one it is so
> > we can prevent using it in our designs ? ;-)
> I don't get it, I'm using Gemalto ELS31J module.

Thank you, added to blacklist ;-)

> I compare the successful log below: Seems some pppos_input() got 
> different length.

A serial link is a byte stream, having different buffer lengths for each 
run is normal behavior. 

Anyway, you can enable PPP packet trace with PRINTPKT_SUPPORT and 
optionally PPP_PROTOCOLNAME if you wish to have a closer look at PPP 
control packets content but I doubt it will provide any useful 
information in this case because the session is successfully 


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