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.

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

Clock Models (Thiago) (GSoC 2011)

• Student: ThiagodeFreitas
• Mentors: JudahLevine, HarlanStenn
• GSoC: GSoC Project Page

Summary

The goal of this project is to analyze the usefulness of different clock models for NTP, contributing for an enhanced performance. The goal is to use filtering techniques to analyze 2 issues. The first is a parameter that provides an explicit connection between the polling interval and the accuracy of the synchronization process. The second issue is a more sophisticated model for the performance of the clock on the local system and for the network delay.

Related Items: ClockAlgorithms

Tasks

Theoretical Report 1 - Phase-Locked Loops and Frequency Locked Loops

This report consists on a discussion about the theory of the control loops involved in the Clock Discipline, mainly the Phase-Locked Loop(PLL) and the Frequency-Locked Loops(FLL).

Theoretical Report 2 - Clock Statistics

This report consists on a discussion about the current available Clock Models, Allan Variance and the parameters involved in the Clock Analysis.

Timeline

Date	Task	Description	% Done
2011-04-25		Accepted student proposals announced on the Google Summer of Code 2011 site.
2011-04-27	Community Bonding	Students get to know mentors, read documentation, get up to speed to begin working on their projects.
2011-05-24	Coding begins	Students begin coding for their GSoC projects
2011-05-24	Theory Report 1	Report about PPL, FLL - Collecting Material, Reading, Studying, Organizing
2011-05-28	Theory Report 1	Started writing the report
2011-06-05	Theory Report 1	Conclude the Report 1 and send to Dr.Levine and Harlan
2011-06-06	[OFF] University Exams	Final Examinations/Tests Week at the University begins
2011-06-15	[OFF] University Exams	Exams Ends
2011-06-16	Back to Work
2011-07-11	Start mid-term evaluations	Mentors and students can begin submitting mid-term evaluations.
2011-07-15	Mid-term evaluations	Mid-term evaluations deadline
2011-08-15	Wrap-up	Suggested 'pencils down' date. Take a week to scrub code, write tests, improve documentation, etc.
2011-08-22	Firm 'pencils down' date.	Mentors, students and organization administrators can begin submitting final evaluations to Google.
2011-08-26	Final evaluation	Final evaluation deadline
2011-08-30	Code samples	Students can begin submitting required code samples to Google

Discussion and Comments