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r2 - 2015-03-29 - 23:40:17 - HarlanStennYou are here: NTP >  Dev Web > DevelopmentIssues > NtpStartupIssues
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-4.2.8p13 was released on 07 March 2019. It addresses 1 medium-severity security issue in ntpd, and provides 17 non-security bugfixes and 1 other improvements over 4.2.8p12.

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.

NTP Startup Issues

The usual perspective when starting NTP is that there are two "startup conditions", cold-start (boot) and warm-start (restart).

Related Topics: NtpStartupStepChoices

Cold Start

At cold-start, we don't know how long the machine has been "off" and we may not have a good idea of any needed frequency or offset correction. No services requiring monotonic time are running.

At cold-start, it is expected we can safely make any changes to system time that we want.

 

Warm Start

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