CentOS - Jan 2014 - Advice in Time Sync

Dear all,

I would need some advice as I am a beginner in CentOS.

The question is as follows:

How to set up timing if NTP was block by ISP?

I have try many way such as link the timezone , getting from the hardware
clock.However , it is not the solution.

Please advice.

-- 
Regards,
Ku Wei Xiong
0166365831

On 1/14/2014 11:56 PM, Ku Wei Xiong wrote:
> How to set up timing if NTP was block by ISP?
your ISP doesn't have their own timeserver you can access??

I've never heard of an ISP blocking ntp protocol, unless they are 
blocking /everything/ but web and email via proxy, whereupon they aren't 
really an internet service provider, they are just a web-n-mail service 
provider.


-- 
john r pierce                                      37N 122W
somewhere on the middle of the left coast

You can setup a your own NTP server following this howto:
http://brainwreckedtech.wordpress.com/2008/08/25/howto-run-your-own-ntp-server-when-your-isp-blocks-ports/
and adapting it for CentOS, or you can use a workaround like trying to
setup a cron job to run ntpdate every 15 minutes to sync system time
with ntp.org public servers using unprivilleged port.

15 * * * * /usr/sbin/ntpdate -s -u -B pool.ntp.org

-s option tells ntpdate to print output to syslog; -u tells it to use
unprivilleged port; -B tell it to adjust the time incrementally as
oppose to instantly.

Then setup ntpd as a local ntp server for internal use. This ntpd uses
it's localtime as the source instead of syncing from another ntp.org
public server.

On Wed, Jan 15, 2014 at 8:56 AM, Ku Wei Xiong <kuweixiong at gmail.com>
wrote:
> Dear all,
>
> I would need some advice as I am a beginner in CentOS.
>
> The question is as follows:
>
> How to set up timing if NTP was block by ISP?
>
> I have try many way such as link the timezone , getting from the hardware
> clock.However , it is not the solution.
>
> Please advice.
>
> --
> Regards,
> Ku Wei Xiong
> 0166365831
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos


-- 
"The intuitive mind is a sacred gift and the rational mind is a
faithful servant. We have created a society that honors the servant
and has forgotten the gift." (A. Einstein)

"La mente intuitiva ? un dono sacro e la mente razionale ? un fedele
servo. Noi abbiamo creato una societ? che onora il servo e ha
dimenticato il dono."  (A. Einstein)

Fabrizio Di Carlo

On 1/15/2014 00:56, Ku Wei Xiong wrote:
>
> How to set up timing if NTP was block by ISP?
Perhaps your ISP is just blocking NTP servers outside your country.

I believe the telephone number you gave in your signature terminates in 
Thailand, so try using th.pool.ntp.org.  That domain name will resolve 
to an IP that is in Thailand.

If my guess about your country is wrong, the same advice applies, except 
that you will of course need to seek out a different section of the NTP 
pool:

	http://www.pool.ntp.org/