Tiger ntpd configuration

Right after you have finished setting up your Tiger's ipfw firewall, stop by the NTPD Pool Project page, and pickup a group of those near to wherever you are.
Stop your ntpd daemon, like this:

% sudo /System/Library/StartupItems/NetworkTime/NetworkTime stop

Then, edit the file '/private/etc/ntp.conf', and add those, the file has to end like this:

server 0.south-america.pool.ntp.org prefer iburst minpoll 12 maxpoll 15
server 1.south-america.pool.ntp.org minpoll 12 maxpoll 15
server 2.south-america.pool.ntp.org minpoll 12 maxpoll 15
server 3.south-america.pool.ntp.org minpoll 12 maxpoll 15
server time.apple.com minpoll 12 maxpoll 15
server clock.via.net minpoll 12 maxpoll 15

And then, start the daemon once again, it will print a message while connecting to the remote ntpd servers:

% sudo /System/Library/StartupItems/NetworkTime/NetworkTime start
Starting network time synchronization
Looking for host 0.south-america.pool.ntp.org and service ntp
host found : imp-254.topgroup.com.ar
Looking for host 1.south-america.pool.ntp.org and service ntp
host found : c8daab2b.maxiweb.com.br
Looking for host 2.south-america.pool.ntp.org and service ntp
host found : titan.cais.rnp.br
Looking for host 3.south-america.pool.ntp.org and service ntp
host found : mail.wholenet.com.ar
Looking for host time.apple.com and service ntp
host found : time7.apple.com
Looking for host clock.via.net and service ntp
host found : clock.via.net

Let it run a couple of minutes, and then query it, like this:

% ntpq -np
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 200.218.171.44  .INIT.          16 u    -  68m    0    0.000    0.000 4000.00
 146.164.48.5    .GPS.            1 u  136  68m    1  324.722   -3.956   0.001
 64.209.30.130   128.2.1.22       3 u  135  68m    1  239.466    9.647   0.001
 200.80.32.170   91.189.94.4      3 u  134  68m    1   10.275  -12.162   0.001
 17.151.16.23    17.254.0.49      2 u  133  68m    1  219.404   -6.055   0.001
 209.81.9.7      .GPS.            1 u  132  68m    1  230.757   -0.375   0.001