June 2000
Intermediate to advanced
512 pages
15h 18m
English
Content preview from Linux Network Administrator's Guide, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Debugging Your PPP Setup
By default, pppd logs any warnings and error messages
to syslog’s daemon
facility. You have to add an entry to syslog.conf that redirects
these messages to a file or even the console; otherwise, syslog
simply discards them. The following entry
sends all messages to /var/log/ppp-log:
daemon.* /var/log/ppp-log
If your PPP setup doesn’t work right away, you should look in this log
file. If the log messages don’t help, you can also turn on extra
debugging output using the debug option. This output makes
pppd log the contents of all control packets sent
or received to syslog. All messages then go to the
daemon facility.
Finally, the most drastic way to check a problem is to enable kernel-level
debugging by invoking pppd with the kdebug
option. It is followed by a numeric argument that is the sum of the
following values: 1 for general debug messages, 2 for printing the contents of
all incoming HDLC frames, and 4 to make the driver print all outgoing
HDLC frames. To capture kernel debugging messages, you must either run
a syslogd daemon that reads the
/proc/kmsg file, or the klogd daemon.
Either of them directs kernel debugging to the syslog
kernel facility.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.