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Software Downloads

Current versions of NTP

Release	Version	Date	Download	ChangeLog
Stable	4.2.6p5	2011/12/24	http/md5	http
Development	4.2.7p255	2012/01/29	http/md5	http

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Stable Release NEWS
About the NTP Reference Implementation Source Releases
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Stable Release NEWS

NTP 4.2.6p5 (Harlan Stenn , 2011/12/24)

Focus: Bug fixes

Severity: Medium

This is a recommended upgrade.

This release updates sys_rootdisp and sys_jitter calculations to match the RFC specification, fixes a potential IPv6 address matching error for the "nic" and "interface" configuration directives, suppresses the creation of extraneous ephemeral associations for certain broadcastclient and multicastclient configurations, cleans up some ntpq display issues, and includes improvements to orphan mode, minor bug fixes and code clean-ups.

New features / changes in this release:

ntpd

Updated "nic" and "interface" IPv6 address handling to prevent mismatches with localhost [::1] and wildcard [::] which resulted from using the address/prefix format (e.g. fe80::/64)
Fix orphan mode stratum incorrectly counting to infinity
Orphan parent selection metric updated to includes missing ntohl()
Non-printable stratum 16 refid no longer sent to ntp
Duplicate ephemeral associations suppressed for broadcastclient and multicastclient without broadcastdelay
Exclude undetermined sys_refid from use in loopback TEST12
Exclude MODE_SERVER responses from KoD rate limiting
Include root delay in clock_update() sys_rootdisp calculations
get_systime() updated to exclude sys_residual offset (which only affected bits "below" sys_tick, the precision threshold)
sys.peer jitter weighting corrected in sys_jitter calculation

ntpq

-n option extended to include the billboard "server" column
IPv6 addresses in the local column truncated to prevent overruns

Complete NEWS file
Complete Change Log

About the NTP Reference Implementation Source Releases

The NTP (R&D) Project only produces source code releases of The NTP Reference Implementation; users needing precompiled versions of NTP should see the links page. These releases may be installed using the standard Unix make command in conjunction with a compiler and all necessary libraries.

Please contact your operating system vendor for binary packages or assistance with your package-management system.

The NTP version numbering page explains the version numbering scheme.

Browsing the Archives from the NTP (R&D) Project at www.ntp.org

Tarballs for production and development versions of The NTP Reference Implementation are available from the:

Obsolete versions of The NTP Reference Implementation are available from:

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Ports to other operating systems

Third-party implementations, including pre-compiled versions for operating systems such as Microsoft Windows, and some ports of the NTP package are linked to on the links page.