r1 - 2014-01-28 - 02:12:06 - HarlanStennYou are here: NTP >  Support Web > MainItems > TechnicalBackgroundInformation > NtpTheoryOfOperation
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 NtpTheoryOfOperationDev for discussion of this topic.

Talk about the t1, t2, t3, t4 timestamps. Talk about the various noise frequencies, and how we can do better by finding and tracking these.

Talk about how PTP can use t5 and t6 timestamps.

Note that there are two inter-reliant parts of the package, the protocol and the algorithms.

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