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Installing NTP NTP may be installed from the original source code, released by the NTP Project (which was originally from the University of Delaware starting in t...

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

NTP Support Web This is a web based collaboration area for Community Supported Documentation for the reference implementation of NTP from www.ntp.org. Please see ...

Current Version Of NTP Download Follow NTP On: Twitter LinkedIn Facebook Network Time Foundation hosts monthly virtual online fundraising events. Each...

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...

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...

* .DruLavigne: * * .MohammadBakeer: ClockLinks WebHome

Getting Started With NTP What NTP is and what it does The internal clocks of most computers are rather inaccurate. You can correct the clock by hand on occasion...

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...

Undisciplined Local Clock The Undisciplined Local Clock should generally no longer be used. It was originally designed to be used when an ntpd must be able to se...

Starting NTP 4 Start ntpd as Early as Possible As early as possible in the boot sequence, run: ntpd g N (note that in versions 4.0 thru 4.1.2, you must ...

Orphan mode Orphan Mode is the stated replacement for the UndisciplinedLocalClock. It was added to ntp 4.2.2. Orphan Mode allows a group of ntpd processes to auto...

How to calibrate the system clock using NTP If you have a NTP daemon running and configured for a reliable time server, NTP will discipline your system clock. If ...

Discussion of changes to the GettingStarted page Create this page. I've chopped out some of the page structuring commands because I don't think we will need them...

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

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

Windows Time Service Beginning with Windows 2000, Microsoft includes the Windows Time Service with all versions of Windows. Initially, the pupose of Windows Time ...

Troubleshooting NTP First things first. Please be sure you have your NTP network properly designed. Also make sure you have NTP properly configured. If your ntp.c...

Quick Start Guides Hints * Distribution Documentation: Quick Start Page * GettingStarted

NTP related definitions Many of the following come from the RFCs. The following terms are defined in RFC 1305: $ Stability: How well a clock can maintain a con...

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 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...

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...

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...

NTP Access Policy It was proposed on the NTP questions mailing list to publish the access policy for ntp via ntp/tcp. Since ntp (the time protocol) only uses ntp/...

Known Hardware Issues APIC and ACPI These can cause problems for maintaining clock accuracy. See the APIC and ACPI topics under ConfiguringTrimblePalisadeAcutime...

Motorola Oncore Refclock Users NTP Version Operating System Computer Oncore Model # Status Who 4.2.0 Solaris 8 Sun Ultra 10 M12 T Working ...

Modem Refclock Users NTP Version Operating System Modem Service Status Who dev (and older) NIST, USNO Working Dave Mills Related Topi...

Garmin Refclock Users NTP Version Operating System Computer Vendor and Model # Status Who 4.2.4 FreeBSD6 x86_64 18 LVC works Users.KimSi...

u blox Antaris Refclock Users NTP Version Operating System Computer Model # Status Who 4.2.4p5 FreeBSD 6.4p3 i386 Antaris 4 GPS works Us...

WWVB Refclock Users NTP Version Operating System Computer WWVB Receiver Status Who 4.2.0 1.1161 FreeBSD 5.4 433 MHz PC Spectracom 8170 OK ...

SHM Refclock Users NTP Version Operating System Computer Talks to Status Who 4.2.5p117 #64;1.1730 o Linux/2.4.32 NANO Athlon 1GHz shm_splc.c...

NMEA Refclock Users NTP Version Operating System Computer Vendor and Model # Status Who 4.2.4p4 Linux 2.4.20.NANO, FreeBSD 6.2 x86 Accord NA...

REFID Format Related Topics: , Dev.UpdatingTheRefidFormat, Dev.LeapSmearForNTPv4 The peers command of the ntpq utility (also available using the ntpq p command) ...

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Z3801A GPS receiver modifications Description The Z3801A is a GPS timing receiver designed for CDMA base stations. Many of these devices are available on the sur...

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

Vendor Links The following NTP related links are (usually) contributed, and maintained, by the respective vendor. Individuals finding errors are encouraged to con...

Yost Serial Connectors * https://yost.com/computers/RJ45 serial/ * http://www.sol.net/serial guide/ Harlan makes one change to the above he does a pigtail...

Proxies, Tunnels, and VPNs Proxies, Tunnels, and VPNs Oh, My! Proxies, Tunnels, and VPNs Oh, My! Shamelessly stolen from The Wizard of Oz. UDP vs. TCP Mos...

Manual Calibration without NTP This section describes how to calibrate the clock to an accuracy of order tenths of a second. This procedure was found useful when...

Discussion area for KnownOsIssues It appears that OS X uses the information in /private/etc/ntp.conf to populate /etc/ntp.conf. We need to have someone with an OS...

Inexpensive OEM GPS Receivers With PPS Garmin GPS 18LVC * Refclock Driver: Type 20 * PPS: 1us * Cost: ~$70 $80 (2007 11 10) * Specifications: ht...

The NTP Project hosts one IETF mailing list for the NTP Working Group and the IETF.WebHome Wiki web. However, there are a number of documents which appear to be m...

Java SNTP Client This is a Java implementation of an NTP client, and is released under the GPL license. It handles NTP parameters as native Java types, making it ...

Monitoring and Controlling NTP See TroubleshootingNTP for checking the behavior of a particular machine. Monitoring NTP For ongoing monitoring of an NTP network ...

Known Operating System Issues Lost Interrupts There are several mechanisms for systems to miss timer interrupts. All cause troubles for time keeping. Scheduler ...

Time Scales There are two primary time scales used today, TAI and UTC. As of 2006, 23 leap seconds have been added to UTC. UTC was not defined until 1972. It is d...