Thanks for your kind answer.
 
 
> Look into the "restrict" commands in ntp.conf to implement security
> policies on NTP. You can find information on how it works on "man
> ntp_acc".

The default restrict config likes below.
 
restrict default nomodify notrap noquery

If I setup ntpd service as a client not server, above options are sufficient?
I would like to deny any ntpd query packets except reply packets from others because of client.
 
but it seems that other clients can query the date.
 
 
Thanks in advance.
 

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