[ntp:questions] adding access restrictions to the windows ntp config

Ron Frazier (NTP) timekeepingntplist at c3energy.com
Wed Feb 15 08:30:10 UTC 2012

Hi all,

In my research operating ntpd on Windows and Linux, I discovered that 
the default ntp.conf installed by Meinberg does not have any access 
restrictions.  I think it would be a good idea to add this to your file 
unless you require more liberal access for your LAN, etc.  This is the 
default setup for my Ubuntu Linux machines.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery

# allow unrestricted access from the localhost (so that you may monitor ntpd
# and perform on-the-fly configuration changes with ntpdc)
# Local users may interrogate the ntp server more closely.
# IPv4
# IPv6
restrict -6 ::1




(PS - If you email me and don't get a quick response, don't be concerned.
I get about 300 emails per day from alternate energy mailing lists and
such.  I don't always see new messages very quickly.  If you need a
reply and have not heard from me in 1 - 2 weeks, send your message again.)

Ron Frazier
timekeepingdude AT c3energy.com

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