r2 - 2019-02-08 - 01:15:18 - RafaelSzendrodiYou are here: NTP >  Servers Web > PublicTimeServer001540
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.

  • CNAME ntp-s1.cortex.pads.ufrj.br
  • Note: IP addresses (IPv4 and IPv6) are subject to change, please use DNS instead!
  • Performance statistics are available at https://rrd.pads.ufrj.br/public_ntp

ServerStratum StratumOne
CountryCode BR
Hostname ntps1.cortex.pads.ufrj.br
IP Address
IPv6 Address 2001:470:1f07:d::1f
UseDNS Yes
PoolMember Yes
ServerLocation Laboratory for the Processing of Analog and Digital Signals (PADS), Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
HostOrganization PADS/PEE - COPPE - UFRJ
GeographicCoordinates Lat: 2251.69'S. Lon: 4313.71'W. Alt: 25m
ServerSynchronization NTP V4 Primary (Ublox NEO-6M (Gy-neo5mv2 apm2) GPS Module Receiver with internal 1 PPS output signal and GPS ANTENNA 1575.42MHz 3-5V external active antenna), Linux Slackware with PPSAPI + NTPD type 20 driver, running under Raspberry Pi 3 B+ (Broadcom BCM2837B0 , Cortex-A53 (ARMv8) 64-bit SoC @ 1.4GHz) with RTC DS3231 module, working since Jan. 2019
ServiceArea Brazil, Latin America and Caribbean
AccessPolicy OpenAccess
AccessDetails Please limit to two peer hosts (preferentially stratum 2 servers) per domain. Clients (end-users) should use only stratum 2 servers for synchronization.
NotificationMessage No
AutoKey No

SymmetricKey No


ServerContact Rafael Jorge Csura Szendrodi (szendro@pads.ufrj.br).
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