r4 - 2003-11-10 - 02:46:15 - SteveKosteckeYou are here: NTP >  Support Web > WebChanges
NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.

ntp-4.2.8p15 was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.

Please see the NTP Security Notice for vulnerability and mitigation details.

Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

50 Recent Changes in Support Web retrieved at 13:07 (GMT)

Statistics for Support Web Month: Topic views: Topic saves: File uploads: Most popular topic views: Top contributors for topic save and ...
Monitoring and Controlling NTP See TroubleshootingNTP for checking the behavior of a particular machine. Monitoring NTP For ongoing monitoring of an NTP network there ...
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 the ...
# # Configuring NMEA Refclocks Generic NMEA refclocks use the 127.127.20.x driver. The configuration directives required depends on the receiver and its internal ...
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 able ...
Quick Start Guides Hints Documentation: Quick Start Page GettingStarted NTP 4.x for Windows NT Hints DaleWorley2 External Documents Windows ...
Time Scales There are two primary time scales used today, and https://en.wikipedia.org/wiki/UTC UTC. As of 2006, 23 leap seconds have been added to UTC. UTC was ...
Vendor Links The following NTP related links are (usually) contributed, and maintained, by the respective vendor. Individuals finding errors are encouraged to contact ...
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 Client ...
Windows Time Service Beginning with Windows 2000, Microsoft includes the Windows Time Service with all versions of Windows. Initially, the pupose of Windows Time Service ...
Installing NTP NTP may be installed from the original source code, released by the Project (which was originally from the University of Delaware starting in the 1980s ...
Orphan mode Orphan Mode is the replacement for the UndisciplinedLocalClock. It was added to ntp 4.2.2. Orphan Mode allows a group of ntpd processes to automonously ...
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 constant ...
ntpd access restrictions Restrictions are used to control access to your ntpd and are, unfortunately, one of the most misunderstood parts of ntpd configuration ...
Garmin Refclock Users NTP Version Operating System Computer Vendor and Model # Status Who 4.2.4 FreeBSD6 x86 64 18 LVC works ...
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 ...
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 serve ...
Known Operating System Issues Lost Interrupts There are several mechanisms for systems to miss timer interrupts. All cause troubles for time keeping. Scheduler HZ ...
Choosing Reference Clocks There are many choices for reference clocks. In increasing levels of precision they are: modem refclocks radio refclocks ...
Known Hardware Issues APIC and ACPI These can cause problems for maintaining clock accuracy. See the APIC and ACPI topics under 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 useful ...
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 ...
Inexpensive OEM GPS Receivers With PPS Garmin GPS 18LVC Refclock Driver: Type 20 PPS: 1us Cost: ~$70 $80 (2007 11 10) Specifications: https ...
Yost Serial Connectors https://yost.com/computers/RJ45 serial/ https://www.sol.net/serial guide/ Harlan makes one change to the above he does a pigtail ...
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 Engagement ...
NTP Related RFCs Draft RFCs (None at this time) Current RFCs 5905: Network Time Protocol Version 4: Protocol and Algorithms Specification 5906: Network ...
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 unsupported ...
u blox Antaris Refclock Users (If you think more/different columns are needed, please edit accordingly!) NTP Version Operating System Computer Model ...
TOPIC TITLE HERE Security of NTP see https://www.ietf.org/rfc/rfc1305.txt Appendix C RalfHauser 16 Sep 2009
VMware and NTP General Notes VMWare ESX server includes a version of the reference implementation ntpd running as a service in the VMware service console. As of ESX ...
Configuring Modem Refclocks ACTS Dave Mills uses: server 127.127.18.1 minpoll 12 maxpoll 17 phone atdt913034944774 atdt917195676742 This calls NIST in Boulder ...
Supybot Wrangler Wanted We use a on Main.ContactInformation the NTP Project IRC channels and we could really use somebody who to "take care of it" and help make ...
NTP 4.x for Windows NT The document included in this topic is not cached , it is included from its original location (https://www.eecis.udel.edu/~mills/ntp/html ...
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 from ...
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 surplus ...
Cisco NTP Almost all Cisco networking devices (routers, switches, firewalls, etc.) include an NTP implementation. Some routing protocols require synchronized time ...
OpenNTPD OpenNTPD is an independent partial re implementation of NTP. It aims to be a simple, reliable, and highly secure implementation. Related Topics: OpenNTPD ...
Chrony Chrony is an NTP implementation for UNIX like operating systems that is designed to work well on systems with intermittent network connectivity. Related Topics ...
Other Implementations Of NTP An index of third party implementations of NTP.
Clock Links General interest, non commercial, time related links. Tube Clocks and the Nixie Wristwatch Jeff Thomas / Resonant Instruments LLC LeapSecond ...
Please contact postmaster #64;ntp.org if you have any questions about anything related to the mail system for ntp.org or the mailing lists we host at our site. If ...
The Project uses the following dynamic Black Lists to reduce the amount of spam delivered through our mail server: rbl plus.mail abuse.org blackholes.mail ...
The 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 following ...
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 ...
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 its ...
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 model ...
nop NTP sidebar configuration See also .TWikiSideBar. Navigation Help Wanted FAQ Pool Docs
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 you ...
Designing Your NTP Network The design of your NTP network depends on: your reliability goals your physical network layout the number of machines that ...
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