12-11-2001
I'm not positive, but I don't think the standard telnet daemon has provisions for logging each and every single failed login attempt. It will however log repeated login failures. (Maybe there are custom telnet daemons that will?)
Most people I know use system accounting to keep track of logins.
Your syslog facility should log repeated login failures as it is.
Basically, if a particular daemon (telnet for this case) doesn't have logging that specifically provides for logging of everything to syslog, changing the syslog.conf isn't going to do anything to help you. It only tells syslog which message levels to log and which to ignore pretty much.
I hope this isn't too confusing.
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SYSLOG(8) System Logging SYSLOG(8)
NAME
syslog-ng, syslogd
DESCRIPTION
There are different syslog daemon implementations supported as the system's syslog service, currently syslogd, syslog-ng and rsyslogd
The first installed daemon activates itself for the syslog service. Starting with openSUSE-11.2, it is rsyslogd, before it was syslog-ng.
But this depends on the software selection during the installation.
The name of the daemon used as syslog service is specified in the
SYSLOG_DAEMON variable in /etc/sysconfig/syslog.
The yast2 sysconfig module provides a comfortable way to switch to another installed daemon and restart the service.
The /etc/init.d/syslog init script is able to handle all supported daemons.
BUGS
Please report bugs at <http://www.suse.de/feedback>
AUTHOR
Juergen Weigert <jw@novell.com>
Marius Tomaschewski <mt@novell.com>
SEE ALSO
sysklogd(8) syslogd(8) syslog.conf(5) syslog-ng(8) syslog-ng.conf(5) rsyslogd(8) rsyslog.conf(5)
syslog May 2008 SYSLOG(8)