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Re: [lwip-users] PPPoS : no response from modem after link established

From: Sergey A. Borshch
Subject: Re: [lwip-users] PPPoS : no response from modem after link established
Date: Sun, 8 Jul 2018 01:26:03 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 07.07.2018 23:41, Sylvain Rochet wrote:

The problem is identical to to described at
(but there was no solution proposed)

I don't know how you managed to conclude that no solution was
proposed... User had CHECKSUM disabled, see:
Thank you very much for pointing this. I didn't understand how did I missed that answer. Yes, disabling hardware checksum calculation did the trick and now everything works ok.

Can I suggest to add some flag into netif to enable/disable software checksum calculation? Using this flag can be selectable at compile time #if (PPP_SUPPORT != 0) && (CHECKSUM_GEN_xxx == 0)
 add flag into netif, init it in ppp_create and use

  - modem stops responding after status_cb:
connected. I checked twice with logic analyzer - there is to responses to
frames with proto=0x21. I tried two SIM cards from different mobile
providers (one requires authentication, the other not) with exactly same
result - I can get IP, DNS etc but no data exchange.

What did I missed to do?

Did you check that you are actually receiving IP packets on the remote
side ?
I have no access to other side - I have no computers with real IP (I'm in third mobile operator local network).


  Sergey A. Borshch            mailto: address@hidden
    SB ELDI ltd. Riga, Latvia

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