r5 - 2012-07-15 - 09:07:31 - LukeJMilitelloYou are here: NTP >  Support Web > ConfiguringNTP > ConfiguringRefclocks > RefclockUsers > ModemRefclockUsers
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 ModemRefclockUsersDev for discussion of this topic.

14.10. Modem Refclock Users

NTP Version Operating System Modem Service Status Who
-dev (and older)     NIST, USNO Working Dave Mills
4.2.6p5 Ubuntu 10.04 U.S. Robotics USR5686G NIST, USNO Works out of the box. Never use PCI (software) modems, always go with an external hardware modem. LukeJMilitello

Related Topics: ConfiguringModemRefclocks

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