nRF9160-DK , Modem_shell demo , ppp unable to access the Internet

Hello,guys

I build nrf9160-dk modem_shell demo as cmd '$ west build -b nrf9160dk_nrf9160ns ' and then '$ west flash ', after the system running up, I try to ping baidu website，it works as follow picture.

And then I rebuild the Modem_shell demo with cmd ' $ west build -p -b nrf9160dk_nrf9160_ns -d build -- -DOVERLAY_CONFIG=overlay-ppp.conf' for supporting ppp function. After the system running up, I try to ping baidu website again，it works as follow picture and it work failed.

I can capture any data from another serial, I guess VCOM0 serial is shell and VCOM2 serial is ppp channel.

To test my guess，I plugged nrf9160-DK board into my Ubuntu virtual machine and disable Ubuntu network. Use minicom tool to connect VCOM0 and open nrf9160-DK shell in A terminal, set the custom configuration for PPP uart with cmd 'ppp uartconf -b 115200' . New B terminal for ppp connection , type cmd ' $sudo pppd -detach /dev/ttyACM2 115200 DK-ip:Ubuntu-ip noauth nocrtscts local ' , then A terminal return "Dial up connection up" . New C terminal and type cmd ' ifconfig ' , I can see ppp0 and it's ip ,I try to ping baidu website,it work as follow picture.

it can't access the Internet ? why ? Did I operate wrong? Please point out my mistakes.

The version of modem_fw I use is 1.3.0 , ncs version is 1.7.0.

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0 user2115 over 4 years ago

Hi,

You are unfortunately running into a known issue with NCS v1.7.0:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/known_issues.html?v=v1-7-0#other-issues

Issue is described here:

https://github.com/zephyrproject-rtos/zephyr/issues/38516

While a fixed is posted in this PR:

https://github.com/zephyrproject-rtos/zephyr/pull/38517

Could you try applying the above PR and see if it works better on your end?

Kind regards,

Håkon
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0 user109346 over 4 years ago in reply to user2115

Hello Håkon, thanks for your technical support.

yep, I merge this commit

https://github.com/zephyrproject-rtos/zephyr/pull/38517/commits/4ecaebf2b04fd48a1def8f8adf7bd3cc1528c482

and do the experiment again. Unfortunately, my VM-Ubuntu unable to access the network, it still doesn't work.

Best wish.

Jackychen
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0 user109346 over 4 years ago in reply to user2115

Just like this?

It looks like it got the DNS.

So, Should I type AT cmd "AT%XEPCO=0" to the modem_shell that I previously ran ,if I using modem_shell demo?

Thanks~

JackyChen
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0 user2115 over 4 years ago in reply to user109346

Hi,

leadercxn said:
It looks like it got the DNS.

Yes, that is great!

leadercxn said:
So, Should I type AT cmd "AT%XEPCO=0" to the modem_shell that I previously ran ,if I using modem_shell demo?

Yes, that is correct.

Kind regards,

Håkon
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0 user109346 over 4 years ago in reply to user2115

Yep, I do what I said before, the result is like this:

the DK board can get the dns and I can ping www. website, but I try to connect the DK board with ppp on the other terminal, it failed.

What should I do next?

Thanks~

JackeyChen
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0 user109346 over 4 years ago in reply to user109346

I try reset, power on and Off the dk-board again, change the computer, it fail too.

Thanks~

JackyChen
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0 user2115 over 4 years ago in reply to user109346
Hi,

The DNS and ping seems to work fine, but the PPP connection seems to be not functional.

Can you try to let it assign IP automatically, ie. do not specify it directly? It seems that you've tried several of these settings before, but I'm unsure which you've connected to when trying to ping.

sudo pppd -detach /dev/ttyACM0 115200 noauth nocrtscts local

Kind regards,

Håkon
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0 user2115 over 4 years ago in reply to user109346
Hi,

The DNS and ping seems to work fine, but the PPP connection seems to be not functional.

Can you try to let it assign IP automatically, ie. do not specify it directly? It seems that you've tried several of these settings before, but I'm unsure which you've connected to when trying to ping.

sudo pppd -detach /dev/ttyACM0 115200 noauth nocrtscts local

Kind regards,

Håkon
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0 user109346 over 4 years ago in reply to user2115

emmm... I have tried to type cmd "sudo pppd -detach /dev/ttyACM0 115200 noauth nocrtscts local" , but it unable to connect DK-board by ppp, it show

，

and the DK-board didn't react at all.

Thanks~

JackyChen
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0 user2115 over 4 years ago in reply to user109346

Did you issue "ppp up" in the terminal before attaching with "pppd ..." on the PC side?

Kind regards,

Håkon
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0 user109346 over 4 years ago in reply to user2115

No... because I change the computer to try, but I get the same result...
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0 user2115 over 4 years ago in reply to user109346
Hi,

Could you try issuing "ppp up" before attaching via pppd?

It should print the following afterwards in the uart terminal:

mosh:~$ ppp up modem data socket 4 created for modem data PPP data socket 5 created PPP net if up.

Kind regards,

Håkon
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0 user109346 over 4 years ago in reply to user2115

Oh, I forget "ppp up"...

Now I enter “ppp up” and then "pppd ..." , ppp0 still no working in the PC...

I
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