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23.3. Specifying a Configuration File

The command-line options and other options, which cannot be set on the command line, can be set in an optional configuration file.
No configuration file is read by default, so it needs to be specified at runtime with the -f option. For example:
~]# ptp4l -f /etc/ptp4l.conf
A configuration file equivalent to the -i eth3 -m -S options shown above would look as follows:
~]# cat /etc/ptp4l.conf
verbose               1
time_stamping         software