r2 - 2014-01-28 - 02:37:01 - RichardWeltyYou are here: NTP >  Support Web > MainItems > TechnicalBackgroundInformation > NtpMotivation
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.
REFACTOR See NtpMotivationDev for discussion of this topic.

Clocks in Computers and Hardware devices are problematic. Unsynchronized, they drift, sometimes very rapidly and certainly unpredictably. This can cause substantial problems in situations where accurate time keeping is required, for example in debugging of network applications and devices, and when auditing the results of such applications. A Java application may use the system clock to get the time, and then may send UPDATE statements to an SQL server using the now() operator to get the SQL server's system time, and who is to say that the clocks are even remotely keeping the same time?

Network Time Protocol (NTP) provides facilities for synchronizing clocks, maintaining their accuracy, and correcting them gently and appropriately when significant errors are detected.

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