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Dear community, I have Ubuntu 22.04 system, on which i am trying to configure ntp with v4.2.8p17 from source code. As Ubuntu 22.04 repository has ntp with latest...

ntpd Access Restrictions Restrictions are used to control access to your ntpd and are, unfortunately, one of the most misunderstood parts of ntpd configuration. ...

AccessRestrictions needs a section dealing with adding restrict lines for time sources such as unicast, multicast and broadcast servers. .SteveKostecke 10 May...

Adding NTP Server Variables To create a variable called access_policy just add this line to ntp.conf (see miscopt.htm in the NTP docs): setvar access_policy="open...

Adjusting Radio clocks Radioclocks must be adjusted to compensate for the timecodes to be transmitted from the sender to the radio clock. A simple approach is to ...

The NTP Project uses a variety of standard anti spam techniques to protect our mail server from excessive abuse from spammers, including but not limited to the f...

ATOM (PPS) Refclock Users NTP Version Operating System Computer PPS Source/Connection Status Who 4.2.4 Solaris 7 Sun SPARCstation IPC work...

Bancomm Refclock Users NTP Version Operating System Computer Model # Status Who 4.2.4 FreeBSD 5.3 Pentium P55C/233Mhz bc637PCI Working R...

Problem I downloaded bk 3.0.1 powerpc macosx.bin how do I install it? Solution According to Eugene Surovegin the answer is: You need to use unix shell, not Stu...

The NTP Project uses the following dynamic DNS based Black Lists to reduce the amount of spam delivered through our mail server: * rbl plus.mail abuse.org *...

Replying to Bugzilla mail about existing bugs You may reply to any bugzilla mail for an existing bug and the text of your reply will be appended to the bug commen...

Choosing An Identity Scheme There are three Autokey Identity Schemes currently included in the NTP Reference Implementation: IFF, GQ, and MV: IFF GQ ...

Choosing Reference Clocks There are many choices for reference clocks. In increasing levels of precision they are: * modem refclocks * radio refclocks ...

Chrony Chrony is an NTP implementation for UNIX like operating systems that is designed to work well on systems with intermittent network connectivity. Related To...

Cisco NTP Almost all Cisco networking devices (routers, switches, firewalls, etc.) include an NTP implementation. Some routing protocols require synchronized time...

Hi I read "Xen, VMware, and Other Virtual Machine Implementations". Is a Virtual Machine not a good candidate to serve as an NTP Server , under any circumstanc...

Clock Links General interest, non commercial, time related links. * Nixie Tube Clocks and the Nixie Wristwatch Jeff Thomas / Resonant Instruments LLC * Le...

Configuring ATOM (PPS) Refclocks The ATOM refclock is built by default. Building is enabled/disabled by the option enable ATOM or disable ATOM in the configure ...

Configuring Audio Refclocks Here's some hints with regards to audio refclock debugging. These drivers include the wwv, irig, and chu reference clocks. Make sure y...

Autokey Configuration for NTP stable releases This topic provides a step by step guide for setting up NTP Autokey Authentication for NTP stable release versions 4...

Discussion of ConfiguringAutokey ConfiguringAutokey was created to fill a need for an accurate step by step guide for setting up NTP Authentication using Autokey....

Autokey Configuration for NTP 4.2.4 (and earlier) This topic provides a step by step guide for setting up NTP Autokey Authentication for NTP versions up through 4...

Configuring Bancomm Refclocks (Add useful information here) Related Topics: BancommRefclockUsers

Installing an Endrun Praecis CT CDMA based refclock. I usually prefer Mototola Oncore reference clocks, but this one needed to be installed in the 32nd floor of a...

Configuring Garmin Refclocks General Notes The Garmin GPS18 LVC works well with NTP. Beware: The other models of the GPS18 don't have PPS support. You should be ...

Configuring HP Z3801A Refclocks The HP Z3801A is popular with hams. They also make great reference clocks for NTP. A large number of them were available surplus f...

Configuring Hopf Refclocks (Add useful information here) Related Topics: HopfRefclockUsers

Configuring Irig Refclocks GPS, IEEE 1344, and NTP a field report In a system I'm involved with, we had a field failure, when time in the computers fed by a NTP...

Configuring Jupiter Refclock with Linux This driver is only valid for Jupiter GPS Modules that support the Rockwell/Conexant/Navman binary interface (up to the mo...

Configuring Local Refclocks All refclocks are local in that they are directly attached to an ntpd. Sometimes it is neccessary to synchronize clocks in the absence...

Configuring Modem Refclocks ACTS Dave Mills uses: server 127.127.18.1 minpoll 12 maxpoll 17 phone atdt913034944774 atdt917195676742 This calls NIST in Boulde...

Configuring Motorola ONCORE Refclocks I try to summarize the necessary steps to set up an M12 T for precision timing using: 1 Set Position Hold position, eithe...

Configuring Motorola ONCORE Refclocks Development Discussion Here is where we discuss the stuff from ConfiguringMotorolaOncoreRefclocks. Please chime in below... ...

Configuring Multicast Servers REPLACE ME WITH YOUR TEXT

Configuring NMEA Refclocks Generic NMEA refclocks use the 127.127.20.x driver. The configuration directives required depends on the receiver and its internal conf...

Configuring NTP Simple Client Configuration The example ntp.conf files below are different between 4.2.6 and earlier vs. 4.2.7 and later, because the latter has...

This topic should contain more information about configuring NTP. There is a little more information in StartingNTP. * Authentication * private key ...

Configuring PCI SyncClock32 Refclocks From ntp 4.2.0 to ntp 4.2.2, more precisely with changeset 1.1152.9.9, the refclock_gpsvme.c changed from a reference clock ...

Configuring PPS With PARSE Refclocks There seems to be a slight lack of worked examples of using the PPS facility in ntp, so I'll document my (working) system. (...

Configuring PPS with unsynchronised Rubidium Source The equipment In the specific case of the author, a high quality Rubidium frequency source was employed by RF...

Configuring PST Traconex Refclocks (Insert useful information here) Related Topics: PSTTraconexRefclockUsers

Configuring Parse Refclocks Related Topics:: ParseRefclockUsers Configuring a Meinberg GPS167BGT Harlan uses the Yost serial connector scheme. The COMx and TxD p...

Configuring Refclocks * By Name * By Refclock Driver Number * Adjusting Radioclocks #ByName By Name * Configuring ATOM (PPS) Refclocks * Configuri...

Configuring SHM Refclocks Under LINUX there is the gpsd service which provides SHM services. In ntp.conf include lines: # ... and use gpsd daemon for time sync s...

Configuring Spectracom TSync PCI Refclocks Add useful information here...

Configuring Trimble Palisade/Acutime Refclocks This topic explains how to get a Trimble Palisade/Acutime refclock working and points out some tips that will be us...

Configuring TrueTime Refclocks The TrueTime refclock driver was meant to support a variety of legacy TrueTime hardware. In addition this driver can be used as a g...

Configuring u blox Antaris Refclock The GPS receiver from u blox is very nice for the use as a time source, as the 1 PPS time pulse is routed to the DCD line of i...

Configuring WWVB Refclocks (Insert useful information here) Related Topics: WWVBRefclockUsers

Configuring WWV Refclocks These notes concern getting the WWV refclock driver working on Linux. Redhat linux 9.0 did not work with ntp 4.2.0 due to some unsupport...