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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">If you’re running NTP 4.2.8, there’s a new directive “pool” that regularly removes defunct servers and resolves new ones from a pool address.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">If you want to run your own stratum 1 NTP server, I can recommend the
<a href="http://leontp.com/">LeoNTP</a> which is relatively cheap [1]. You do need to have good GPS reception, but it runs off PoE so you can just run some ethernet near a window. I would still run NTP on your gateways and have them sync to it rather than having
clients point directly at it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">[1] I received mine free for stress-testing it in the public NTP pool, it has served 70,000 requests per second at times without missing a beat.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">-- <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">James Andrewartha<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">Network & Projects Engineer<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">Christ Church Grammar School<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">Claremont, Western Australia<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">Ph. (08) 9442 1757<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:Verdana;color:black">Mob. 0424 160 877</span><span style="font-size:11.5pt;font-family:Verdana;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-family:Calibri;color:black">From:
</span></b><span style="font-family:Calibri;color:black">cisco-voip <cisco-voip-bounces@puck.nether.net> on behalf of Charles Goldsmith <wokka@justfamily.org><br>
<b>Date: </b>Monday, 8 May 2017 at 10:52 pm<br>
<b>To: </b>"Haas, Neal" <nhaas@co.fresno.ca.us><br>
<b>Cc: </b>"cisco-voip@puck.nether.net" <cisco-voip@puck.nether.net><br>
<b>Subject: </b>Re: [cisco-voip] CCX and NTP<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt">To expand on this, I would point to your voice gateways with everything internal, then the voice gateways would either use an on-prem NTP server that is radio sync'd or one that Neal has advised. That way, everything
is synced together with the same source. <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">For UCCX and other apps, I point them to the UCM pub and the pub points to the voice gateways.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">I've seen a lot of people advise for
<a href="http://pool.ntp.org">pool.ntp.org</a>, but that has bitten me. How often does an NTP process refresh from DNS? I suspect only on reboot or a restart of the NTP process. I've seen too many NTP servers go offline when using the pool addresses. Because
of that, I've been sticking with .gov based NTP on the voice gateway.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Ryan Huff, one thing about pointing to strata 1 servers, most of them have restrictions from what I've seen, while they work, they could block you for not being approved if you send too many requests. <a href="http://support.ntp.org/bin/view/Servers/StratumOneTimeServers">http://support.ntp.org/bin/view/Servers/StratumOneTimeServers</a>
has a list, and while many have open access listed, if you look at the details, they can still have restrictions.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Just food for thought.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">On Mon, May 8, 2017 at 9:20 AM, Haas, Neal <<a href="mailto:nhaas@co.fresno.ca.us" target="_blank">nhaas@co.fresno.ca.us</a>> wrote:<o:p></o:p></p>
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<a name="m_5908957790101886209__MailEndCompose"><span style="color:#1F497D">Get an on-prem NTP server, if you cant spend the money, use:</span></a><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D"><a href="http://time.nist.gov" target="_blank">time.nist.gov</a> global address for all servers Multiple locations</span><o:p></o:p></p>
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<span style="color:#1F497D"><a href="http://utcnist.colorado.edu" target="_blank">utcnist.colorado.edu</a> 128.138.140.44 University of Colorado, Boulder</span><o:p></o:p></p>
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<span style="color:#1F497D"><a href="http://utcnist2.colorado.edu" target="_blank">utcnist2.colorado.edu</a> 128.138.141.172 University of Colorado, Boulder</span><o:p></o:p></p>
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<span style="color:#1F497D"><a href="http://time-nw.nist.gov" target="_blank">time-nw.nist.gov</a> 131.107.13.100 Microsoft, Redmond, Washington</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">Really, anything with a GOV, or EDU should be good.</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">By the way, you should NEVER, EVER, EVER (can’t stress this enough) a Windows Based NTP. Every place that I have went into and removed a Windows Time server, everything has worked better! Windows just cant do time. I went into a
business with windows NTP, and the guy was checking time from about 100 NTP servers, his time was off by three minutes. Took it down to 3 and everything started to work.</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">Thank You,</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">Neal Haas</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<b>From:</b> cisco-voip [mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>]
<b>On Behalf Of </b>Ben Amick<br>
<b>Sent:</b> Monday, May 8, 2017 7:12 AM<br>
<b>To:</b> <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br>
<b>Subject:</b> [cisco-voip] CCX and NTP<o:p></o:p></p>
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<o:p></o:p></p>
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What do you guys use for NTP on your CCX hosts? I’ve been informed by TAC that “CCX does not support Windows based NTP” so I was thinking about just pointing NTP towards my CCM hosts – is that a valid scenario? I figure that since CCM is pretty much authoritative
on everything for CCX as it is it wouldn’t be a problem?<o:p></o:p></p>
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<span style="font-family:Garamond"> </span><o:p></o:p></p>
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<b><span style="font-size:10.0pt;font-family:Garamond;color:#3B3838">Ben Amick</span></b><o:p></o:p></p>
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<span style="font-size:9.0pt;font-family:Garamond;color:#3B3838">Telecom Analyst</span><o:p></o:p></p>
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<o:p></o:p></p>
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