On Tuesday, August 30, 2011 08:15:28 PM brian wrote:
...to your rule list will allow the specified net address(es) to contact you on port 123. the above, of course, assumes your input port is eth0 (change that, if different on your system), and that the NTP server uses TCP protocol (change that to UDP, otherwise). should be enough to get you started on the right track, anyway.
NTP uses UDP. Also, NTP uses addresses in the 127/8 space locally for configuration purposes; see the NTP man pages and the main ntp.org website for thorough documentation on all the options and what those other addresses in 127/8 do.
This is one of those cases where you read the full upstream documentation set before you change anything; kindof like attempting an automatic transmission rebuild project where the instructions say clearly 'read entire procedure before performing any work' and the instructions mean that very literally.