[ntp:questions] Re: [pool.ntp.org] 87 servers so far / web server configuration / some other small things
brad.knowles at skynet.be
Fri Sep 19 01:14:04 UTC 2003
At 12:55 AM +0000 2003/09/19, Dale Worley wrote:
> I'm curious how many *clients* are using the pool service. One way to
> count would be to log DNS queries for 'pool.ntp.org'.
Keep in mind that local nameservers can cache this data, thus
hiding the amount of people who might be served by a particular
caching nameserver and using pool.ntp.org.
> Another would
> be to do periodic 'ntpdc -c monlist -n' on each member of the pool and
> see what clients use more than one member of the pool (which should
> eliminate clients of the server within the server's organization).
Keep in mind that NTP will only use the first IP address it finds
that provides a response. Combine that with the fact that many
caching resolvers don't do round-robin, and even if you have multiple
instances of "pool.ntp.org" listed in your /etc/ntp.conf file, you'll
most likely end up having each of those lines result in trying to
talk to the same server.
Brad Knowles, <brad.knowles at skynet.be>
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
-Benjamin Franklin, Historical Review of Pennsylvania.
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!w--- O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++)
tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++)
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