On 2009-01-26, [email protected] <[email protected]> wrote:
> I have a network isolated the internet but I need a time server to run > on this private network. Are there any standalone time server packages > out there? Is there a way to force ntpd to sync with my computer clock > and then run sending out the time data? NTP is designed to synchronize computer clocks to a common time-base. The most frequently used time-base is UTC; usually acquired over a network. But others can be substituted. In the absence of a proper time-base you _can_ use the Undisciplined Local Clock or Orphan Mode to allow your ntpd to claim to be synchronized to a time source You have a number of choices for the acquisition of a time-base: 1. Use a radio clock (e.g. GPS) as suggested elsewhere in this thread 2. Use a modem to dial-up the ACTS time service at NIST 3. Use a high-quality (e.g Rubidium) oscillator / frequency reference to feed PPS or IRIG to your time server 4. Use dumb-clock to obtain time stamps over a serial link from a properly synchronized local time server If you wish to operate your time island without a proper time-base there are some steps that you can take to maximize time stability: 1. Dedicate one computer as a time server. This time server should _not_ be running Windows. An old Pentium-1 is more than adequate 2. Connect this server to a network in an environment which is similar to that of the time island and configure it to poll 4 remote time servers (see http://support.ntp.org/s2 to choose servers). Let your time server run for at least 24 hours so that ntpd is able to calculate an approximate frequency correction 3. Reconfigure the time server to use the Undisciplined Local Clock (or, if you are using a recent enough version of NTP, Orphan Mode) and move the system to the time island 4. Use ntpdc to manually trim the frequency offset when your time island drifts visibly from wrist-watch time -- Steve Kostecke <[email protected]> NTP Public Services Project - http://support.ntp.org/ _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
