[cisco-voip] CCX and NTP

[Charles Goldsmith]

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.

For UCCX and other apps, I point them to the UCM pub and the pub points to
the voice gateways.

I've seen a lot of people advise for pool.ntp.org, 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.

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.
http://support.ntp.org/bin/view/Servers/StratumOneTimeServers has a list,
and while many have open access listed, if you look at the details, they
can still have restrictions.

Just food for thought.

On Mon, May 8, 2017 at 9:20 AM, Haas, Neal <nhaas at co.fresno.ca.us> wrote:

> Get an on-prem NTP server, if you cant spend the money, use:
>
>
>
> time.nist.gov     global address for all servers       Multiple locations
>
> utcnist.colorado.edu      128.138.140.44  University of Colorado, Boulder
>
> utcnist2.colorado.edu    128.138.141.172                University of
> Colorado, Boulder
>
> time-nw.nist.gov             131.107.13.100  Microsoft, Redmond,
> Washington
>
>
>
> Really, anything with a GOV, or EDU should be good.
>
>
>
> 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.
>
>
>
> Thank You,
>
>
>
> Neal Haas
>
>
>
> *From:* cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] *On Behalf
> Of *Ben Amick
> *Sent:* Monday, May 8, 2017 7:12 AM
> *To:* cisco-voip at puck.nether.net
> *Subject:* [cisco-voip] CCX and NTP
>
>
>
> 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?
>
>
>
> *Ben Amick*
>
> Telecom Analyst
>
>
>
>
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