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.
Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.
Clock Models (Thiago) (GSoC 2011)
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
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.
Discussion and Comments