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 /usr/share/doc/sfptpd/config directory:
sfptpd -i <interface> -f /usr/share/doc/sfptpd/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.