NTP syncing

[Paul Howarth]

Mike McMullen wrote:
> Here is the contents of my ntp.conf file:
> 
> # Prohibit general access to this service.
> restrict default ignore
> #restrict 66.187.233.4 mask 255.255.255.255 nomodify notrap noquery
> 
> # Permit all access over the loopback interface.  This could
> # be tightened as well, but to do so would effect some of
> # the administrative functions.
> restrict 127.0.0.1

...

> # --- OUR TIMESERVERS -----
> # or remove the default restrict line
> # Permit time synchronization with our time source, but do not
> # permit the source to query or modify the service on this system.
> 
> # restrict mytrustedtimeserverip mask 255.255.255.255 nomodify notrap noquery
> # server mytrustedtimeserverip

You need to add lines here:

restrict time.nist.gov      mask 255.255.255.255 nomodify notrap noquery
restrict ns.arc.nasa.gov    mask 255.255.255.255 nomodify notrap noquery
restrict tick.usno.navy.mil mask 255.255.255.255 nomodify notrap noquery

...

> # --- GENERAL CONFIGURATION ---
> #
> # Undisciplined Local Clock. This is a fake driver intended for backup
> # and when no outside source of synchronized time is available. The
> # default stratum is usually 3, but in this case we elect to use stratum
> # 0. Since the server line does not have the prefer keyword, this driver
> # is never used for synchronization, unless no other other
> # synchronization source is available. In case the local host is
> # controlled by some external source, such as an external oscillator or
> # another protocol, the prefer keyword would cause the local host to
> # disregard all other synchronization sources, unless the kernel
> # modifications are in use and declare an unsynchronized condition.
> #
> 
> server  time.nist.gov prefer
> server  ns.arc.nasa.gov prefer
> server  tick.usno.navy.mil prefer
> 
> #server 66.187.233.4

Wasn't there a line:

server  127.127.1.0     # local clock

here originally?

> fudge   127.127.1.0 stratum 10

Cheers, Paul.