At the moment lots of servers suffers from denial of service attacks targeting NTP protocol on port 123 by issuing MONLIST requests to victims computers. Victims computers answer with large list of last NTP clients. Thus consuming a lot of network bandwidth. It is possible to restrict MONLIST response by adding these lines to ntp.conf file:

restrict -4 default nomodify nopeer noquery notrap
restrict -6 default nomodify nopeer noquery notrap
restrict source nomodify noquery notrap
restrict ::1

This is good on installed NTP version (4.2.5p200). I found that on newer versions - starting from 4.2.6 MONLIST is replaced by safer MRUNLIST.

I'm trying to update NTP on Solaris 11 machine by issuing command pkg update ntp, but it seems that on Oracle repository only version 4.2.5 is available.

I found newer version 4.2.8p6 at http://www.ntp.org/downloads.html. So my question is - how to install this new NTP version on Solaris 11? It is not a Solaris package.

1 Answer 1


NTP 4.2.8p2 is included if you upgrade to Solaris 11.3, the currently supported version of Solaris 11.

  • If I upgrade it to Solaris 11.3 version - like it is explained here - do I have to back up the files located at /opt directory? Commented Feb 8, 2016 at 18:36
  • It appears the procedure on that site is following the vendor's procedure for the upgrade. When in doubt, refer to Oracles procedure. When creating a new boot environment as part of the upgrade, everything should carry over. You can always mount a different BE to verify. Commented Jan 3, 2017 at 19:17

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