[ntp:questions] Re: Setting up a synchronization network

Maarten Wiltink maarten at kittensandcats.net
Fri Jan 16 22:45:27 UTC 2004

"Richard B. Gilbert" <rgilbert88 at comcast.net> wrote in message
news:4JmdnS-66-AGQprdRVn-gQ at comcast.com...
> I did ask my ISP (Comcast), at home, about NTP servers.  Their tech
> support promptly gave me a bogus IP address and hung up.   The IP
> address was not reachable and was recorded as belonging to the Internet
> Assigned Numbers Authority (IANA).  Does any one know if Comcast has
> such a server?

It appears not to. (Tried DNS lookups of ntp, clock, time, and chime
in domain comcast.com, the first three also with zero or one appended.
Not conclusive but it tends to find most ISP NTP servers.)

Was that IP address in 10/8, 172.16/12, or 192.168/16, by any chance?
It may have been an internal IP address. ISP _do_ tend to run NTP
servers, because log files are worth little without accurate time, but
good ISPs will either make those servers accessible to their clients,
or specialised ones.

> It's not terribly important at home; I only have six computers running
> and it's a hobby/self study lab.

While I like to think I have a good ISP, they break the rule of having
disjunct reference pools for their three peers. I synch my gateway with
the one of those that's aliased to ntp.$isp.$net and mostly have
excellent convergence. (It's actually quite bad right now, but I've
never seen that before.)

Maarten Wiltink

More information about the questions mailing list