How to Turn on PPP Debugging

The next task shows how to use the pppd command to obtain debugging information.

You only need to perform step 1 through step 3 once for each host. Thereafter, you can proceed to step 4 to turn on debugging for the host.

1. Create a log file to hold output from pppd.

   % touch /var/log/pppdebug

2. Add the following syslog facilities for pppd in /etc/syslog.conf.

   daemon.debug;local2.debug /var/log/pppdebug

3. Restart syslogd.

   % pkill -HUP -x syslogd

4. Turn on debugging for calls to a particular peer by using the following syntax of pppd.

   % pppd debug call peer-name

   peer-name must be the name of a file in the /etc/ppp/peers directory.

5. View the contents of the log file.

   % tail -f /var/log/pppdebug

   For an example of a log file, see Example 35–3.