user@debian:~$ mtr ‐-order "LSB" ::1 mtr: Failed to resolve host: ‐-order: Name or service not known user@debian:~$ mtr ‐o "LSB" ::1 mtr: Failed to resolve host: ‐o: Name or service not known user@debian:~$ This option is documented in --help and in manual page, but does not appear to be supported. Regards, Witold