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.

Multicast Status and Issues

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

Also see:

• http://www.kohala.com/start/mcast.api.txt
• http://publib16.boulder.ibm.com/pseries/en_US/aixprggd/progcomc/skt_multicast.htm

-- 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.org.

OS	OSversion	IPv4 Client	IPv6 Client	IPv6 Server	See Who	Comments
Debian	Linux 2.4.26	Working	Untested		SteveKostecke	Using IFF/AutoKey
GNU	Linux 2.4.21	Failing	Untested	Untested	DannyMayer	(albert) Address in use
sparc-sun-solaris	2.10	Working	Working	Working	DannyMayer
FreeBSD	4.9	Working	Working	Working	DannyMayer	(hepzibah)

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.