topic Re: NTP time source in Operating System - HP-UX

NTP time source

chad_c — Mon, 25 Sep 2006 14:30:18 GMT

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

Re: NTP time source

James R. Ferguson — Mon, 25 Sep 2006 14:32:17 GMT

Hi Chad:

See:

http://www.ntp.org/

Regards!

...JRF...

Re: NTP time source

Steven E. Protter — Mon, 25 Sep 2006 15:04:30 GMT

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

Re: NTP time source

Ivan Ferreira — Mon, 25 Sep 2006 17:27:38 GMT

Re: NTP time source

Bill Hassell — Mon, 25 Sep 2006 17:38:30 GMT

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.

Re: NTP time source

A. Clay Stephenson — Mon, 25 Sep 2006 17:40:50 GMT

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

Re: NTP time source

chad_c — Mon, 25 Sep 2006 17:42:16 GMT

good resources provided