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

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Author: Steven A. DuChene
Date:  
To: plug-discuss
Subject: Re: correct way to set timezone & clock/date?
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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