RE: correct way to set timezone & clock/date?

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Author: Bob Elzer
Date:  
To: 'Steven A. DuChene', 'Main PLUG discussion list'
Subject: RE: correct way to set timezone & clock/date?
try syncing to ntp.cox.net, found this while googling, not sure if it will
work or not, try pinging it first maybe.



-----Original Message-----
From:
[mailto:plug-discuss-bounces@lists.plug.phoenix.az.us] On Behalf Of Steven
A. DuChene
Sent: Tuesday, August 25, 2009 12:50 PM
To: Alex Dean; Main PLUG discussion list
Subject: Re: correct way to set timezone & clock/date?

My Cox cable modem has a time display that is set by their network and the
time on my system is set to under a minute different than that display.
Besides if I cannot get any sort of reply from the ntp servers how can I
tell what time they are synced to?
--
Steve

-----Original Message-----
>From: Alex Dean <>
>Sent: Aug 25, 2009 3:45 PM
>To: "Steven A. DuChene" <>, Main PLUG
>discussion list <>
>Subject: Re: correct way to set timezone & clock/date?
>
>How far off is your current time from the ntp server's time? If
>they're way out of whack, I think ntp will refuse to synchronize. I
>forget how large of a disparity it will handle, but if they're an
>entire hour different, it might just do nothing. I'd expect an error
>message in that case, though. Try setting the system time with 'date'
>to something close to the ntp server's time, then start up the ntp
>process again.
>
>alex
>
>On Aug 25, 2009, at 2:43 PM, Steven A. DuChene wrote:
>
>> Hmm, Here it never starts doing those transmit packets after locating
>> the servers.
>>
>> I just tried it with the firewall turned off and I still get the same
>> result so it must not be the firewall.
>> I am on a Cox cable modem. I wonder if Cox blocks NTP on their
>> network?
>> --
>> Steve
>>
>> -----Original Message-----
>>> From: Eric Shubert <>
>>> Sent: Aug 25, 2009 3:33 PM
>>> To:
>>> Subject: Re: correct way to set timezone & clock/date?
>>>
>>> Here's what I get on a test server of mine:
>>> [root@dellefield ~]# ntpdate -v -d dewey.lib.ci.phoenix.az.us 
>>> ntp.drydog.com
>>> 25 Aug 12:28:28 ntpdate[6149]: ntpdate 4.2.2p1@1.1570-o Tue May 19
>>> 13:58:06 UTC 2009 (1)
>>> Looking for host dewey.lib.ci.phoenix.az.us and service ntp host 
>>> found : dewey.lib.ci.phoenix.az.us Looking for host ntp.drydog.com 
>>> and service ntp host found : rrcs-66-27-60-10.west.biz.rr.com
>>> transmit(148.167.132.200)
>>> receive(148.167.132.200)
>>> transmit(148.167.132.200)
>>> receive(148.167.132.200)
>>> transmit(148.167.132.200)
>>> transmit(66.27.60.10)
>>> receive(148.167.132.200)
>>> transmit(148.167.132.200)
>>> receive(148.167.132.200)
>>> transmit(148.167.132.200)
>>> receive(66.27.60.10)
>>> transmit(66.27.60.10)
>>> receive(66.27.60.10)
>>> transmit(66.27.60.10)
>>> receive(66.27.60.10)
>>> transmit(66.27.60.10)
>>> receive(66.27.60.10)
>>> transmit(66.27.60.10)
>>> server 148.167.132.200, port 123
>>> stratum 2, precision -20, leap 00, trust 000 refid 
>>> [148.167.132.200], delay 0.09081, dispersion 0.01126 transmitted 4, 
>>> in filter 4
>>> reference time:    ce3eb3eb.9159d1f0  Tue, Aug 25 2009 12:03:07.567
>>> originate timestamp: ce3eb9de.49e55521  Tue, Aug 25 2009 
>>> 12:28:30.288 transmit timestamp:  ce3eb9de.43a0f909  Tue, Aug 25 
>>> 2009 12:28:30.264 filter delay:  0.11383  0.13196  0.11774  0.09081
>>>         0.00000  0.00000  0.00000  0.00000 filter offset: 0.002299 
>>> 0.012727 0.005610 -0.00813
>>>         0.000000 0.000000 0.000000 0.000000 delay 0.09081, 
>>> dispersion 0.01126 offset -0.008137

>>>
>>> server 66.27.60.10, port 123
>>> stratum 2, precision -21, leap 00, trust 000 refid [66.27.60.10], 
>>> delay 0.28584, dispersion 0.00227 transmitted 4, in filter 4
>>> reference time:    ce3eb980.f314d607  Tue, Aug 25 2009 12:26:56.949
>>> originate timestamp: ce3eb9df.19c5555c  Tue, Aug 25 2009 
>>> 12:28:31.100 transmit timestamp:  ce3eb9de.f711a543  Tue, Aug 25 
>>> 2009 12:28:30.965 filter delay:  0.29257  0.28622  0.28584  0.30823
>>>         0.00000  0.00000  0.00000  0.00000 filter offset: 0.002869 
>>> 0.004561 0.005198 -0.00578
>>>         0.000000 0.000000 0.000000 0.000000 delay 0.28584, 
>>> dispersion 0.00227 offset 0.005198

>>>
>>> 25 Aug 12:28:31 ntpdate[6149]: adjust time server 148.167.132.200
>>> offset
>>> -0.008137 sec
>>> [root@dellefield ~]#
>>>
>>> So the ntp servers are ok. Are you in a position to stop the
>>> firewall momentarily for a test to be sure that's where your blockage
is?
>>>
>>> Steven A. DuChene wrote:
>>>> I ran the following:
>>>>
>>>> ntpdate -v -d dewey.lib.ci.phoenix.az.us ntp.drydog.com
>>>>
>>>> and it looked for and found both hosts but then just sits there
>>>> with no other output.
>>>> --
>>>> Steve
>>>>
>>>>
>>>>    -----Original Message-----
>>>>    From: Eric Cope
>>>>    Sent: Aug 25, 2009 3:10 PM
>>>>    To: Main PLUG discussion list
>>>>    Subject: Re: correct way to set timezone & clock/date?

>>>>
>>>>    You can force an update, instead of waiting on the incremental
>>>>    changes. But, as noted below, it may affect services.
>>>>    Eric

>>>>
>>>>    On Tue, Aug 25, 2009 at 11:42 AM, Jon M. Hanson
>>>>    < <mailto:jon@the-hansons-az.net>> wrote:

>>>>
>>>>        ntp also adjusts your clock gradually so it won't immediately
>>>>        jump to
>>>>        the correct time. This is to prevent problems with services
>>>>        (like cron
>>>>        and logging) that depend on a clock that doesn't suddenly 
>>>> change.

>>>>
>>>>        Sent from my iPhone

>>>>
>>>>        On Aug 25, 2009, at 11:33 AM, Alex Dean <
>>>>        <mailto:alex@crackpot.org>> wrote:

>>>>
>>>>> Try tailing /var/log/messages (you said this was fedora, right?) 
>>>>> when you start up the ntp daemon.  It can take a while (>1 minute
>>>>> sometimes) for the time servers to synchronize, but you
>>>>        should see
>>>>> some log activity during that time to show you that it's working.

>>>>>
>>>>> alex
>>>>>
>>>>> On Aug 25, 2009, at 1:27 PM, Steven A. DuChene wrote:
>>>>>
>>>>>> Hmm, so I did the following:
>>>>>>
>>>>>> # iptables -A input_ext -p tcp -m tcp --dport 123 -j ACCEPT
>>>>>>
>>>>>> and then tried starting ntp services again but it still
>>>>        seems to hang
>>>>>> when trying to get the initial date and time. So adding a
>>>>        rule to the
>>>>>> firewall for tcp access on port 123 seems to have made no
>>>>        difference
>>>>>> to my problem.

>>>>>>
>>>>>> nuts...
>>>>>> --
>>>>>> Steve
>>>>>>
>>>>>> -----Original Message-----
>>>>>>> From: "
>>>>        <mailto:kitepilot@kitepilot.com>" <
>>>>        <mailto:kitepilot@kitepilot.com>>
>>>>>>> Sent: Aug 25, 2009 2:13 PM
>>>>>>> To: "Steven A. DuChene" <
>>>>        <mailto:linux-clusters@mindspring.com>>, Main PLUG
>>>>>>> discussion list <
>>>>        <mailto:plug-discuss@lists.plug.phoenix.az.us>>
>>>>>>> Subject: Re: correct way to set timezone & clock/date?

>>>>>>>
>>>>>>> From /etc/services
>>>>>>>
>>>>>>> ntp             123/tcp
>>>>>>> ntp             123/udp                         # Network Time
>>>>>>> Protocol

>>>>>>>
>>>>>>> I would use "ntp" instead of "udp", and if it doesn't work,
>>>>        take a
>>>>>>> dump...
>>>>>>> :)
>>>>>>> ET

>>>>>>>
>>>>>>
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>>>>>>
>>>>>
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>>>>
>>>>
>>>>
>>>>    --
>>>>    Eric Cope
>>>>    http://cope-et-al.com

>>>>
>>>>
>>>
>>>
>>> --
>>> -Eric 'shubes'
>>>
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>>
>>
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