NTP time source

[chad_c]

Hi. I have to set my HPUX 11.11 ntp.conf file to an accurate time source. Does anyone have a good internet reference IP address to sync to?

Regards,
C

[James R. Ferguson · Accepted solution]

Hi Chad:

See:

http://www.ntp.org/

Regards!

...JRF...

[Steven E. Protter]

Shalom,

On that site, I've always found the Navy and HP are very good sources.

Most corporate neworks do not permit this protocol directly. Generally you have to see you lan admin and use a local time server.

ntp is considered by many network admins to be unsafe.

SEP

[Ivan Ferreira]

See also:

http://ntp.isc.org/bin/view/Servers/NTPPoolServers

[Bill Hassell]

The NTP pool is the best. It saves a lot of effort to check out all the possible servers, finding those that are stable (not off the network at times), etc.

Once you select the NTP pool servers (pick several), you need to test that your firewall is not blocking port 123 to the open Internet. Use this command:

ntpq -p north-america.pool.ntp.org

If you get back some statistics, your firewall is NTP-ready.

[A. Clay Stephenson]

It's really hard to beat the NTP pool servers. They are setup so that a DNS round-robin is done and you get a new list of servers each time NTP is started and open access is allowed. You really want a minimum of 3 or so servers so that the ntp daemon can gather statistics and make intelligent choices. You alos want to configure a fallback to your local clock if network access is unavailable. Entries like this in your /etc/ntp.conf file should work quite well:

server 0.us.pool.ntp.org
server 1.us.pool.ntp.org
server 2.us.pool.ntp.org
server 127.127.1.1 stratum 10 # localhost

[chad_c]

good resources provided