Hi, I am running some tests on the NTP protocol for my company : I need to achieve (if possible) in LAN a precision (for clients) of about 1 millisecond (or less :-))
1. the following properties are studied : - the time for a client to "calibrate" its clock o with/without iburst mode o with/without drift file o with fixed drift o with different values for max polling - the maximum precision achievable for clients : o with different values for max polling o with huff n'puff filter o with all clients in « peer » mode or at least some of them the NTP server clock reference will be : o undisciplined local clock o internet stratum 1 or 2 o GPS (i have a meinberg lantime M300 and PCI card + GPS receiver on loan) I am trying to know here which configuration parameters can improve the "calibration" speed and maximum precision of clients clock. I am not trying to have the exact time on clients but rather, that all clients have the same time. I must run NTP daemon on Windows Server 2003 SP1 and it almost sure that, in the end, NTP servers wont be able to have internet connection or even GPS : they are included in tests because i want to determine the impact of the server precision on the client precision. For the GPS, i know there is some hardware solution that can run in free-run mode after 24h calibration (meinberg). I am sure it is a commun problem but i couldn't find any good reports on it : if you have some that might interest me, that would be great :-)) 2. I just checked the ntpd 4.2.4 changelog : is the windows multimedia timer enabled by default ? Where can i find some informations on it ? 3. I would like to know if there is a way to display the delay in ms in loopstats stats ? I am actually talking about the delay column in ntpq -p. Ok, i am stopping there :-) I know i am asking a lot ! I just need some infos about how to proceed for my tests to be as accurate as possible Thanks, Edouard _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
