r12 - 2013-01-31 - 20:32:12 - TlHackqueYou are here: NTP >  Support Web > ConfiguringNTP > ConfiguringRefclocks > RefclockUsers > NMEARefclockUsers
NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to use in a distributed denial-of-service (DDoS) attack. Please also take this opportunity to defeat denial-of-service attacks by implementing ingress and Egress filtering through BCP38.

The final two security bugs reported by Google's Security Team have been fixed as of ntp-4.2.8p1.

A new set of mode 6 vulnerabilities has been discovered and, while these vulnerabilities can be reduced by making sure you have restrict default noquery in your ntp.conf file, the best and most complete way to avoid these vulnerabilities is to install and deploy ntp-4.2.8p1 which was released on 04 February 2015.

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 NMEARefclockUsersDev for discussion of this topic.

14.12. NMEA Refclock Users

NTP Version Operating System Computer Vendor and Model # Status Who
4.2.4p4 Linux-2.4.20.NANO, FreeBSD-6.2 x86 Accord-NAV2300 OK VenuGopal
4.2.4p4 FreeBSD 6.2 Athlon XP 1200Mhz Garmin GPS 18 LVC works DennisHilbergJr
4.2.5p117@1.1730-o Linux/2.4.32-NANO Athlon 1GHz Garmin GPS35 works StevenBjork
4.2.4p5 NetBSD 4.0 IBM Aptiva 200Mhz Garmin GPS 18 LVC works PierreDubuc
4.2.6p2 openSUSE 11.1 (i586) Kontron 986LCD-M NaviLock NL-302U works, but occasionally time info is one second off HaraldBrinkmann
4.2.6p3-RC7 Linux/2.6.35 64bit AMD PhenomX4 2.2GHz Garmin GPS 18x LVC works JuergenPerlinger
4.2.4p5-a (1) FreeBSD 8.0 Intel Atom single-core GPS 18 LVC works DavidTaylor
4.2.7p97 Windows XP Intel 1.9GHz Pentium 4 GPS 18 LVC works DavidTaylor
4.2.7p97 Windows-7 32-bit Intel 2.8GHz Pentium 4 HT GPS 18x LVC works, but need to separate NMEA (partly works) and PPS (works fine) DavidTaylor
4.2.6p5 Linux 3.2.27 Raspberry Pi (Arm BCM2708) Garmin GPS 18x LVC Works - LinuxPPS PPS GPIO TlHackque

Related Topics: Configuring NMEA Refclocks

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