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I am trying to find the debug infromation of pppd on Ubuntu 13.10. I have tried to read the mannual, but I found that the location of the log is for older version Ubuntu.

what I have input

sudo pon dsl-provider debug
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2 Answers 2

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5

You can see pppd logs in /var/log/syslog

less /var/log/syslog

or 

tail -f /var/log/syslog

or 

cat /var/log/syslog
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  • There are too many logs. Is it possible to rule out irrelevant information?
    – Jill Clover
    Apr 1, 2014 at 12:24
  • only can grep some thing tail -f /var/log/syslog | grep ppp or less /var/log/syslog | grep ppp
    – 2707974
    Apr 1, 2014 at 12:30
  • How can I use plog to print more information?
    – Jill Clover
    Apr 1, 2014 at 12:55
  • By the manual plog shows you the last few lines of /var/log/ppp.log. If that file doesn't exist, it shows you the last few lines of your /var/log/syslog file, but excluding the lines not generated by pppd. This script makes use of the tail(1) command, so arguments that can be passed to tail(1) can also be passed to plog. Same thing on another please. Simple run plog in console and plog will grep pppd log from syslog.
    – 2707974
    Apr 1, 2014 at 13:19
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From pppd man pages:

   debug  Enables  connection  debugging  facilities.   If  this option is
          given, pppd will log the contents of all control packets sent or
          received  in  a  readable  form.  The packets are logged through
          syslog with facility daemon and level debug.   This  information
          can  be  directed  to  a  file  by  setting  up /etc/syslog.conf
          appropriately (see syslog.conf(5)).

So by default all the pppd logs will be redirected to /var/log/syslog.

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