J S wrote:
Hello
I am trying to configure NTP client on a machine but observing
unusual log.
my ntp.config files read this
driftfile /etc/ntp/drift
restrict ntp1.cs.wisc.edu nomodify ntrap noquery
server ntp1.cs.wisc.edu minpoll 4 maxpoll 4
My drift file reads 0.000
whereas tcpdump is unable to capture any packets
<snip>
Lose the restrict statement!
Also, you should not specify minpoll and maxpoll without very good
reason! The defaults were carefully selected and apply to, perhaps, 99%
of all installations. By specifying the values you did, you load the
server unnecessarily and practically guarantee poor timekeeping
performance on your client.
The University of Wisconsin has very good reason to object to such usage
of their server! See http://www.cs.wisc.edu/~plonka/netgear-sntp/
Netgear was very fortunate to avoid a lawsuit and many operators of NTP
servers probably wish that U-Wisconsin had sued Netgear for every dime
they had; the example would have done a lot to prevent current problems.
If you MUST use restrict statements, specify the numeric IP address and
an appropriate value for the net mask. Using the domain name in a
restrict statement is not supported.
Finally, it' a generally a good idea to add "iburst" to the server
statement. This gets ntpd initialized in about twenty seconds vs. five
minutes!
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