Editing Network Time Protocol (section)

=== chrony ===
{{main|chrony}}
[[File:Chrony 4.6 screenshot.webp|thumb|upright=1.2|{{Proper name|chronyc}}, showing Network Time Security (NTS) sources and activity information.]]

[[chrony]] is an independent NTP implementation mainly sponsored by [[Red Hat]], who uses it as the default time program in their distributions.<ref name="Q91Af">{{cite web |url= http://rhelblog.redhat.com/2016/07/20/combining-ptp-with-ntp-to-get-the-best-of-both-worlds/ |title= Combining PTP with NTP to Get the Best of Both Worlds |access-date = 19 November 2017 |last= Lichvar |first= Miroslav |date= 20 July 2016 |website= Red Hat Enterprise Linux Blog |quote= Starting with Red Hat Enterprise Linux 7.0 (and now in Red Hat Enterprise Linux 6.8) a more versatile NTP implementation is also provided via the chrony package |publisher= [[Red Hat]] |archive-url= https://web.archive.org/web/20160730091110/http://rhelblog.redhat.com/2016/07/20/combining-ptp-with-ntp-to-get-the-best-of-both-worlds/ |archive-date= 30 July 2016}}</ref> Being written from scratch, {{Proper name|chrony}} has a simpler codebase allowing for better security<ref name="kYgFj">{{cite web |url= https://www.coreinfrastructure.org/news/blogs/2017/09/securing-network-time |title= Securing Network Time |access-date = 19 November 2017 |date= 27 September 2017 |website= Core Infrastructure Initiative, a Linux Foundation Collaborative Project |quote= In sum, the Chrony NTP software stands solid and can be seen as trustworthy |publisher= Core Infrastructure Initiative |archive-url= https://web.archive.org/web/20171028123642/https://www.coreinfrastructure.org/news/blogs/2017/09/securing-network-time |archive-date= 28 October 2017}}</ref> and lower resource consumption.<ref name="jR9Jg"/> It does not however compromise on accuracy, instead syncing faster and better than the reference ntpd in many circumstances. It is versatile enough for ordinary computers, which are unstable, go into sleep mode or have intermittent connection to the Internet. It is also designed for virtual machines, a more unstable environment.<ref name="Both2018">{{cite web |last1=Both |first1=David |title=Manage NTP with Chrony |url=https://opensource.com/article/18/12/manage-ntp-chrony |website=Opensource.com |access-date=29 June 2019 |language=en |archive-url=https://web.archive.org/web/20190629174030/https://opensource.com/article/18/12/manage-ntp-chrony |archive-date=29 June 2019 |url-status=live}}</ref>

{{Proper name|chrony}} has been evaluated as "trustworthy", with only a few incidents.<ref name="tN0aV">{{cite web |url= https://wiki.mozilla.org/images/e/e4/Chrony-report.pdf |title= Pentest-Report Chrony 08.2017 |access-date = 19 November 2017 |last= Heiderich |first= Mario |date= August 2017 |website= Cure53.de Team |language = en |quote= Withstanding eleven full days of on-remote testing in August of 2017 means that Chrony is robust, strong, and developed with security in mind. |publisher= wiki.mozilla.org, AKA MozillaWiki or WikiMO |archive-url= https://web.archive.org/web/20171005123643/https://wiki.mozilla.org/images/e/e4/Chrony-report.pdf |archive-date= 5 October 2017}}</ref> It is able to achieve improved precision on LAN connections, using hardware timestamping on the network adapter.<ref name="Ocilw">{{cite web |url= https://chrony.tuxfamily.org/doc/4.3/chrony.conf.html#hwtimestamp |title= chrony – chrony.conf(5) |access-date = 2 August 2020 |last= Lichvar |first= Miroslav |date= 18 September 2018 |website= Chrony project |language= en |quote= This directive enables hardware timestamping of NTP packets sent to and received from the specified network interface. }}</ref> Support for Network Time Security (NTS) was added on version 4.0.<ref>{{Cite web|title=chrony/chrony.git - Official Git repository for the Chrony project.|url=https://git.tuxfamily.org/chrony/chrony.git/tree/NEWS?id=4.0#n6|access-date=2021-07-31|website=git.tuxfamily.org}}</ref> {{Proper name|chrony}} is available under [[GNU General Public License version 2]], was created by [[Richard Curnow]] in 1997 and is currently maintained by [[Miroslav Lichvar]].<ref name="jR9Jg">{{cite web |url= https://chrony.tuxfamily.org/ |title= chrony introduction |access-date = 19 November 2017 |website= TuxFamily, a non-profit organization. |quote= The software is supported on Linux, FreeBSD, NetBSD, macOS, and Solaris. |publisher= chrony |archive-url= https://web.archive.org/web/20091209115945/https://chrony.tuxfamily.org/ |archive-date= 9 December 2009}}</ref>