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100 recent changes in Support Web retrieved at 11:19 (GMT)

WebStatistics
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WebHome
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 ...
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* .NathanStrattonTreadway * .DruLavigne
RefidFormat
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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Z3801AReceiverModifications
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...
ConfiguringAutokeyFourTwoFour
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...
ConfiguringTrimblePalisadeAcutimeRefclocks
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...
ChoosingReferenceClocks
Choosing Reference Clocks There are many choices for reference clocks. In increasing levels of precision they are: * modem refclocks * radio refclocks ...
VendorLinks
Vendor Links The following NTP related links are (usually) contributed, and maintained, by the respective vendor. Individuals finding errors are encouraged to con...
TroubleshootingNTP
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...
ConfiguringNTP
Configuring NTP Simple Client Configuration 4.2.7 and Later Simple Client Configuration, Visible on the Internet This is the minimum configuration for an NTP C...
YostSerialConnectors
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...
ProxiesTunnelsAndVPNs
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...
NTPAccessPolicy
NTP Access Policy It was proposed on comp.protocols.time.ntp to publish the access policy for ntp via ntp/tcp. Since ntp (the time protocol) only uses ntp/udp, nt...
ManualCalibration
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...
KnownOsIssuesDev
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...
InexpensiveOemGps
Inexpensive OEM GPS Receivers With PPS Garmin GPS 18LVC * Refclock Driver: Type 20 * PPS: 1us * Cost: ~$70 $80 (2007 11 10) * Specifications: ht...
IetfMailingLists
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...
HowToCalibrateSystemClockUsingNTP
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 ...
JavaSntpClient
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 ...
r12 - 04 Oct 2022 - 21:05 by TodaysTest
KnownHardwareIssues
Known Hardware Issues APIC and ACPI These can cause problems for maintaining clock accuracy. See the APIC and ACPI topics under ConfiguringTrimblePalisadeAcutime...
r28 - 04 Oct 2022 - 21:01 by TodaysTest
MonitoringAndControllingNTP
Monitoring and Controlling NTP See TroubleshootingNTP for checking the behavior of a particular machine. Monitoring NTP For ongoing monitoring of an NTP network ...
r30 - 04 Oct 2022 - 20:59 by TodaysTest
KnownOsIssues
Known Operating System Issues Lost Interrupts There are several mechanisms for systems to miss timer interrupts. All cause troubles for time keeping. Scheduler ...
r50 - 04 Oct 2022 - 20:55 by TodaysTest
GarminRefclockUsers
Garmin Refclock Users NTP Version Operating System Computer Vendor and Model # Status Who 4.2.4 FreeBSD6 x86_64 18 LVC works Users.KimSi...
r21 - 04 Oct 2022 - 20:41 by TodaysTest
NTPRelatedDefinitions
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...
r8 - 04 Oct 2022 - 20:38 by TodaysTest
WindowsTimeService
Windows Time Service Beginning with Windows 2000, Microsoft includes the Windows Time Service with all versions of Windows. Initially, the pupose of Windows Time ...
r13 - 04 Oct 2022 - 20:36 by TodaysTest
TimeScales
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...
r5 - 04 Oct 2022 - 20:32 by TodaysTest
ConfiguringNMEARefclocks
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...
r15 - 04 Oct 2022 - 19:52 by TodaysTest
ConfiguringUBloxAntarisRefclocks
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...
r5 - 04 Oct 2022 - 19:43 by TodaysTest
ConfiguringGarminRefclocks
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 ...
r17 - 04 Oct 2022 - 19:36 by TodaysTest
ConfiguringMotorolaOncoreRefclocksDev
Configuring Motorola ONCORE Refclocks Development Discussion Here is where we discuss the stuff from ConfiguringMotorolaOncoreRefclocks. Please chime in below... ...
r4 - 04 Oct 2022 - 19:35 by TodaysTest
ConfiguringHPZ3801ARefclocks
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...
r13 - 04 Oct 2022 - 19:30 by TodaysTest
AntiSpam
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...
r3 - 04 Oct 2022 - 19:22 by TodaysTest
StartingNTP4
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 ...
r17 - 04 Oct 2022 - 19:19 by TodaysTest
DesigningYourNTPNetwork
Designing Your NTP Network The design of your NTP network depends on: * your reliability goals * your physical network layout * the number of machines th...
r18 - 04 Oct 2022 - 19:17 by TodaysTest
ClockLinks
Clock Links General interest, non commercial, time related links. * Nixie Tube Clocks and the Nixie Wristwatch Jeff Thomas / Resonant Instruments LLC * Le...
r13 - 04 Oct 2022 - 18:23 by TodaysTest
SelectingOffsiteNTPServers
Selecting Offsite NTP Servers Upstream Time Server Selection Criteria When looking for off site NTP servers to be used, keep some things in mind: Rules of Engag...
r25 - 04 Oct 2022 - 18:07 by TodaysTest
OrphanMode
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...
r11 - 04 Oct 2022 - 17:34 by TodaysTest
InstallingNTP
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...
r29 - 04 Oct 2022 - 17:13 by TodaysTest
GettingStarted
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...
r28 - 04 Oct 2022 - 17:08 by TodaysTest
ConfiguringAutokey
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...
r6 - 04 Oct 2022 - 16:15 by TodaysTest
AccessRestrictions
ntpd Access Restrictions Restrictions are used to control access to your ntpd and are, unfortunately, one of the most misunderstood parts of ntpd configuration. ...
r33 - 04 Oct 2022 - 13:06 by TodaysTest
WebPreferences
Network Time Foundation's NTP Support Wiki.Support Web Preferences The following settings are web preferences of the Network Time Foundation's NTP Support Wiki.Su...
MainItems
* Quick Start * Installation * Configuration * Operation * Troubleshooting * FAQ * Background
EndrunPraecisRefclockUsers
https://bugs.ntp.org/show_bug.cgi?id=731 Endrun Praecis Refclock Users NTP Version Operating System Computer Endrun Praecis Model # Status Who ...
ConfiguringJupiterRefclocks
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...
WebAtom
Network Time Foundation's NTP Support Wiki's Support web
WebRss
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NMEARefclockUsers
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...
QuickStartIndex
Quick Start Guides Hints * Distribution Documentation: Quick Start Page * GettingStarted
OrphanModeDev
OrphanModeDev Experience and thoughts about Orphan Mode and configuration (6.2.) Orphan Mode as described and configured https://support.ntp.org/bin/view/Support...
LockingNtpdInMemory
Locking ntpd in memory Related Topics: Dev.NtpdProcessResidencyIssues, Currently, ntpd will lock itself in memory if the appropriate system calls are available....
MotorolaOncoreRefclockUsers
Motorola Oncore Refclock Users NTP Version Operating System Computer Oncore Model # Status Who 4.2.0 Solaris 8 Sun Ultra 10 M12 T Working ...
ConfiguringAtomRefclocks
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 ...
UndisciplinedLocalClock
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...
NtpMotivation
Motivation for NTP Clocks in Computers and Hardware devices are problematic. Unsynchronized, they drift, sometimes very rapidly and certainly unpredictably. This ...
TechnicalBackgroundInformation
Technical Background Information * Motivation * Theory of Operation
NtpTheoryOfOperation
NTP: Theory of Operation Talk about the t1, t2, t3, t4 timestamps. Talk about the various noise frequencies, and how we can do better by finding and tracking the...
HelpWanted
Help Wanted Mailing List Moderators wanted We one (or more) volunteers who are willing to donate ~5 to ~20 minutes a day (total) to moderate our 41 (!) mailing l...
HelpWantedHeadlines
* Mailing List Moderators wanted
ImprovingTheSHMRefclock
Improving the SHM Refclock 127.127.28.u where unit (u) values of 0 and 1 are 0600 from NTP's POV, and units 2 and 3 are 0666. The SHM refclock could stand some i...
ConfiguringSHMRefclocks
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...
ConfiguringParseRefclocks
Configuring Parse Refclocks Related Topics:: ParseRefclockUsers Configuring a Meinberg GPS167BGT Harlan uses the Yost serial connector scheme. The COMx and TxD p...
ModemRefclockUsers
Modem Refclock Users NTP Version Operating System Modem Service Status Who dev (and older) NIST, USNO Working Dave Mills 4.2.6p5 ...
ConfiguringSpectracomTSyncPCIRefclocks
Configuring Spectracom TSync PCI Refclocks Add useful information here...
ConfiguringRefclocks
Configuring Refclocks * By Name * By Refclock Driver Number * Adjusting Radioclocks #ByName By Name * Configuring ATOM (PPS) Refclocks * Configuri...
WWVRefclockUsers
WWV Refclock Users NTP Version Operating System Computer WWV Receiver Status Who 4.2.5p117 #64;1.1730 o Linux/2.6.24.2 PII/400 Ramsey HFRC1 ...
WWVBRefclockUsers
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 ...
TrimblePalisadeAcutimeRefclockUsers
Trimble Palisade Acutime Refclock Users NTP Version Operating System Computer Model # Status Who 4.2.4 Debian Linux 300 Mhz Trimble Thunder...
JupiterRefclockUsers
Jupiter Refclock Users NTP Version Operating System Computer Jupiter Model # Status Who 4.x (any) FreeBSD 6.1 300 MHz Geode TU30 D140 221 (J...
HpZ3801ARefclockUsers
HP Z3801A Refclock Users NTP Version Operating System Computer Status Who ntp 4.2.0b rc1 Linux 2.4 Kernel PPSkit 566 MHz PC OK Users.HalMurr...
HopfRefclockUsers
HOPF Refclock Users NTP Version Operating System Computer Model # NTP Driver # Status Who 4.2.4 Solaris 7 Sun SPARCstation IPC 6855 38 ...
AtomRefclockUsers
ATOM (PPS) Refclock Users NTP Version Operating System Computer PPS Source/Connection Status Who 4.2.4 Solaris 7 Sun SPARCstation IPC work...
ConfiguringAutokeyDev
Discussion of ConfiguringAutokey ConfiguringAutokey was created to fill a need for an accurate step by step guide for setting up NTP Authentication using Autokey....
BancommRefclockUsers
Bancomm Refclock Users NTP Version Operating System Computer Model # Status Who 4.2.4 FreeBSD 5.3 Pentium P55C/233Mhz bc637PCI Working R...
ParseRefclockUsers
Parse Refclock Users NTP Version Operating System Computer Clock Device Mode Status Who 4.2.0 FreeBSD5 x86 Meinberg GPS167BGT 135 Work...
NTPRelatedRFCs
NTP Related RFCs Draft RFCs * (None at this time) Current RFCs * RFC 5905: Network Time Protocol Version 4: Protocol and Algorithms Specification * RFC...
ConfiguringWWVRefclocks
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...
UBloxAntarisRefclockUsers
u blox Antaris Refclock Users NTP Version Operating System Computer Model # Status Who 4.2.0a Linux 2.4.28 i686 u blox Antaris GPS Eval Kit ...
FrequentlyAskedQuestions
Frequently Asked Questions NTP Security NTP Security: MAC (RFC 1305 Appendix C) How to find out which servers provide such authentication? see https://www.ietf....
UsingNTP
NTP is normally started automatically during your OS boot process. Details can be found at StartingNTP and StartingNTP4.
ConfiguringLocalRefclocks
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...
ConfiguringModemRefclocks
Configuring Modem Refclocks ACTS Dave Mills uses: server 127.127.18.1 minpoll 12 maxpoll 17 phone atdt913034944774 atdt917195676742 This calls NIST in Boulde...
NetworkCodeWizardsWanted
Network Code Wizards Wanted The NTP Project needs more networking code wizards the current set of volunteers are swamped. We need help with IPv4 and IPv6, on bo...
ConfiguringAudioRefclocks
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...
IrigRefclockUsersDev
Please use RefclockUsersDev for general discussion about RefclockUsers topics. The wwv and irig drivers work nicely with freebsd and linux in my experience. The u...
IrigRefclockUsers
Irig Refclock Users NTP Version Operating System Computer IRIG/Audio Device IRIG Source Status Who 4.2.0 FreeBSD5 x86 CMedia CMI8738 Mei...
SHMRefclockUsers
SHM Refclock Users NTP Version Operating System Computer Talks to Status Who 4.2.4p4 Mandriva 2007.0 Athlon XP 2400 shmpps works Users....
RefclockUsers
Refclock Users * ATOM Refclock Users * Bancomm Refclock Users * Users of the Dumb Refclock * Endrun Praecis Refclock Users * Garmin Refclock ...
CiscoNTP
Cisco NTP Almost all Cisco networking devices (routers, switches, firewalls, etc.) include an NTP implementation. Some routing protocols require synchronized time...
OpenNTPD
OpenNTPD OpenNTPD is an independent partial re implementation of NTP. It aims to be a simple, reliable, and highly secure implementation. Related Topics: the Open...
Chrony
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...
MailingLists
Mailing Lists The NTP Project uses the industry standard Mailman mailing list management software. This software includes many features to help make it easier for...
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Topic revision: r1 - 08 Sep 2022, DruLavigne
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