[ntp:questions] Suitable ntp.conf for public NTP server?

Dennis Hilberg Jr dhilberg at comcast.net
Sat Oct 28 16:41:10 UTC 2006


I am new to ntpd, and have a question regarding the ntp.conf.

First of all, here is my ntp.conf:


server bigben.cac.washington.edu iburst
server time-nw.nist.gov iburst
server usno.pa-x.dec.com iburst
server nist1.aol-ca.truetime.com iburst
server clepsydra.dec.com iburst

driftfile /etc/ntp/drift
logfile /var/log/ntp.log

Is this an acceptable ntp.conf for running a public ntp server?  I'm 
considering submitting my server to the pool, but only if I know it's 
relatively secure.  I'm having a hard time finding ntp.conf examples for 
public ntp servers with descriptions of each setting.  I've followed 
whatever advice I've found: no more than five servers, no local server, etc. 
I use my ntp server for syncing time on my local network, and it works 

Basically, do I need any other security settings to run a secure 
(relatively) public ntp server?  Or am I good to go to open up the firewall?

Thanks for any assistance!


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