-d, --daemon Runs in daemon mode, forking and exiting from tty.
-f, --config-file config-file Specifies the config file to use for startup. If not specified this option will likely default to /usr/local/etc/ripngd.conf.
-g, --group group Specify the group to run as. Default is quagga.
-h, --help A brief message.
-i, --pid_file pid-file When ripngd starts its process identifier is written to pid-file. The init system uses the recorded PID to stop or restart ripngd. The likely default is /var/run/ripngd.pid.
-P, --vty_port port-number Specify the port that the ripngd VTY will listen on. This defaults to 2603, as specified in /etc/services.
-A, --vty_addr vty-address Specify the address that the ripngd VTY will listen on. Default is all interfaces.
-u, --user user Specify the user to run as. Default is quagga.
-r, --retain When the program terminates, retain routes added by ripd.
-v, --version Print the version and exit.
/usr/local/sbin/ripngd The default location of the ripngd binary.
/usr/local/etc/ripngd.conf The default location of the ripngd config file.
$(PWD)/ripngd.log If the ripngd process is config'd to output logs to a file, then you will find this file in the directory where you started ripngd.