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r7 - 2007-03-27 - 17:24:52 - SteveKosteckeYou are here: NTP >  Servers Web > RestrictedAccess
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-4.2.8p13 was released on 07 March 2019. It addresses 1 medium-severity security issue in ntpd, and provides 17 non-security bugfixes and 1 other improvements over 4.2.8p12.

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.

Restrict Access Time Server

A restricted access time server does not require prior arrangements before use but has some restrictions on its use including, but not limited to:

  • NotificationMessage
  • Service only to clients within a specified ServiceArea
  • Service only to certain types of institutions
  • Maximum number of clients
  • Minimum poll interval

The following limitations and conditions apply to Restricted Access Time Servers unless modified by the Time Server Operator:

  1. iburst may be used
  2. burst may not be used
  3. minpoll/maxpoll may not be changed below the defaults of 64 seconds and 1024 seconds respectively
  4. Clients should honor the KOD message
  5. Time Server IP addresses and/or hostnames may not be hard-coded in any hardware, firmware, or software without advance explicit written permission from the time server operator

Related Topics: OpenAccess, ClosedAccess, AccessPolicy

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