Become superuser on the DHCP server system.
Edit the /etc/syslog.conf file on the server system and add a line of the following format:
where n is the syslog facility number you specified for transaction logging, and path-to-logfile is the complete path to the file to use for logging transactions.
For example, you might add the following line:
See the syslog.conf(4) man page for more information about the syslog.conf file.