To determine what machine the log host is, look in /etc/hosts and /etc/inet/ipnodes and look for lines like

andrews.EECS.Berkeley.EDU:root: %C2> grep loghost /etc/hosts /etc/inet/ipnodes
/etc/hosts:128.32.48.218   bennett.eecs.berkeley.edu bennett loghost mailhost
/etc/inet/ipnodes:128.32.48.218   bennett.eecs.berkeley.edu bennett loghost mailhost

(If we were running yp, we would do ypcat hosts | grep loghost)

To test out syslog, use the logger program:

logger -p daemon.info testing

should send a message to the syslog facility, which usually forwards the message to the loghost, which, as of 3/02, is doppler. The loghost will then handled the message an append it to /var/log/authlog.
On the loghost /etc/syslogd.conf as the following (note that these are two columns separated by tabs)

auth,daemon.info        ifdef(`LOGHOST', /var/log/authlog, @loghost)