[ntp:questions] Re: Question on abusive clients.

John Pettitt jpp at cloudview.com
Fri Dec 23 23:55:51 UTC 2005

Hal Murray wrote:
>>ntpdate uses a random port by default. However standard ntp servers only
>>send and receive NTP packets on port 123.
> Is that right?  I thought ntpdate used 123 by default so it gets an error
> message if ntpd is running rather than trashing the clock out from under
> ntpd.
> The html doc says -u and -d use an unprivileged port, but I don't
> see any place where it says which port it uses if you don't specify
> -u or -d.

It uses 123 unless one of the flags (-q -u or -d as I recall) make it change.


More information about the questions mailing list