r6 - 2004-10-12 - 03:05:03 - SteveKosteckeYou are here: NTP >  Support Web > TestingNTPsBehavior
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 TestingNTPsBehaviorDev for discussion of this topic.

10. Testing NTP's Behavior

Sometimes people want to test how ntpd will behave under various circumstances.

If you want to play with the algorithms that ntpd uses, the ntpdsim program is where to look, and help us out by improving its documentation by writing something here.

This is a good place to add a pointer to a page documenting adding a leap second.

-- HarlanStenn - 05 Oct 2003

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