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.

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Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

Release Issues

The next release will be 4.2.1, which is waiting on:

Fixing the last Multicast bugs

To our knowledge in the current ntp-dev:

• IPv4 broadcast and multicast work on all known Unix systems
• IPv4 broadcast works on Windows systems
• IPv6 multicast client is known to work on Solaris
• IPv6 multicast client is known to work on FreeBSD
• IPv6 multicast server is known to work on FreeBSD
• IPv4 multicast works on Windows systems with authentication disabled
• IPv4 multicast fails on Windows systems with authentication enabled

-- DannyMayer - 29 Jun 2005

Multicast Status Chart

If you are using or have tested a multicast client using the current ntp-dev, please add it to this chart or add a comment below or e-mail your comment to webmaster@ntp.isc.org.

Making sure IPv6 is working

DannyMayer believes IPv6 is working everywhere where IPv6 is supported except under Windows (using ntp-dev).

If you disagree, please let us know.