The configuration settings for sfptpd are enabled, set or disabled in a configuration file.
The path to the configuration file is specified on the sfptpd command line. For example, to use the default ptp_slave.cfg file in the config sub-directory:
./sfptpd -i eth<N> -f config/ptp_slave.cfg
sfptpd also supports a limited number of command line options which override the equivalent config file options. Use the sfptpd -h command to identify supported command line options.