pppd “Couldn't get channel number: Input/output error”

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I have two USB-serial adapters with a null-modem serial cable between them, similar to this user. I can setup an IP connection easily between two linux (ubuntu) boxes running this pppd command on one side:



pppd -detach crtscts lock 10.2.10.2:10.2.10.2 /dev/ttyUSB0 38400 &


and this on the other:



pppd -detach crtscts lock 10.2.10.1:10.2.10.1 /dev/ttyUSB0 38400 &


However, running the same command between a linux box and an embedded linux device (sama5d3x-mb) I receive the following error message:



Couldn't get channel number: Input/output error


This message can appear on either the desktop linux side or the embedded linux side, it just depends on which end the first command is issued. I also occasionally see this message:



LCP: timeout sending Config-Requests


Obviously something isn't setup correctly in the embedded environment. These are the only error messages that appear in the log.



If I instead open up the serial ports using putty/screen I can tx/rx characters back and forth just fine.



One thing I noticed is that on my desktop system I have a folder at /etc/ppp that contains many files. Such a folder does not exist on the embedded environment. I tried dumping a copy there with rsync. However, their presence doesn't seem to make a difference.



Both the deskop and embedded platform report pppd version 2.4.5



Google results mostly turn to dead ends. Short of browsing through the pppd source code, or setting up a sniffer to inspect for any traffic on the lines, I'm sure not where to go from here. Any recommendations?










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    up vote
    1
    down vote

    favorite












    I have two USB-serial adapters with a null-modem serial cable between them, similar to this user. I can setup an IP connection easily between two linux (ubuntu) boxes running this pppd command on one side:



    pppd -detach crtscts lock 10.2.10.2:10.2.10.2 /dev/ttyUSB0 38400 &


    and this on the other:



    pppd -detach crtscts lock 10.2.10.1:10.2.10.1 /dev/ttyUSB0 38400 &


    However, running the same command between a linux box and an embedded linux device (sama5d3x-mb) I receive the following error message:



    Couldn't get channel number: Input/output error


    This message can appear on either the desktop linux side or the embedded linux side, it just depends on which end the first command is issued. I also occasionally see this message:



    LCP: timeout sending Config-Requests


    Obviously something isn't setup correctly in the embedded environment. These are the only error messages that appear in the log.



    If I instead open up the serial ports using putty/screen I can tx/rx characters back and forth just fine.



    One thing I noticed is that on my desktop system I have a folder at /etc/ppp that contains many files. Such a folder does not exist on the embedded environment. I tried dumping a copy there with rsync. However, their presence doesn't seem to make a difference.



    Both the deskop and embedded platform report pppd version 2.4.5



    Google results mostly turn to dead ends. Short of browsing through the pppd source code, or setting up a sniffer to inspect for any traffic on the lines, I'm sure not where to go from here. Any recommendations?










    share|improve this question

























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I have two USB-serial adapters with a null-modem serial cable between them, similar to this user. I can setup an IP connection easily between two linux (ubuntu) boxes running this pppd command on one side:



      pppd -detach crtscts lock 10.2.10.2:10.2.10.2 /dev/ttyUSB0 38400 &


      and this on the other:



      pppd -detach crtscts lock 10.2.10.1:10.2.10.1 /dev/ttyUSB0 38400 &


      However, running the same command between a linux box and an embedded linux device (sama5d3x-mb) I receive the following error message:



      Couldn't get channel number: Input/output error


      This message can appear on either the desktop linux side or the embedded linux side, it just depends on which end the first command is issued. I also occasionally see this message:



      LCP: timeout sending Config-Requests


      Obviously something isn't setup correctly in the embedded environment. These are the only error messages that appear in the log.



      If I instead open up the serial ports using putty/screen I can tx/rx characters back and forth just fine.



      One thing I noticed is that on my desktop system I have a folder at /etc/ppp that contains many files. Such a folder does not exist on the embedded environment. I tried dumping a copy there with rsync. However, their presence doesn't seem to make a difference.



      Both the deskop and embedded platform report pppd version 2.4.5



      Google results mostly turn to dead ends. Short of browsing through the pppd source code, or setting up a sniffer to inspect for any traffic on the lines, I'm sure not where to go from here. Any recommendations?










      share|improve this question















      I have two USB-serial adapters with a null-modem serial cable between them, similar to this user. I can setup an IP connection easily between two linux (ubuntu) boxes running this pppd command on one side:



      pppd -detach crtscts lock 10.2.10.2:10.2.10.2 /dev/ttyUSB0 38400 &


      and this on the other:



      pppd -detach crtscts lock 10.2.10.1:10.2.10.1 /dev/ttyUSB0 38400 &


      However, running the same command between a linux box and an embedded linux device (sama5d3x-mb) I receive the following error message:



      Couldn't get channel number: Input/output error


      This message can appear on either the desktop linux side or the embedded linux side, it just depends on which end the first command is issued. I also occasionally see this message:



      LCP: timeout sending Config-Requests


      Obviously something isn't setup correctly in the embedded environment. These are the only error messages that appear in the log.



      If I instead open up the serial ports using putty/screen I can tx/rx characters back and forth just fine.



      One thing I noticed is that on my desktop system I have a folder at /etc/ppp that contains many files. Such a folder does not exist on the embedded environment. I tried dumping a copy there with rsync. However, their presence doesn't seem to make a difference.



      Both the deskop and embedded platform report pppd version 2.4.5



      Google results mostly turn to dead ends. Short of browsing through the pppd source code, or setting up a sniffer to inspect for any traffic on the lines, I'm sure not where to go from here. Any recommendations?







      embedded serial-port pppd






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      edited Apr 13 '17 at 12:36









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      asked Jan 8 '16 at 23:35









      dtmland

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