I assume you are in Asia. If so, run the following script and
examine the output. Pick three hosts that look best and use them in
place of "3.asia.pool.ntp.org".
Script:
--------cut here---------------
for i in 0 1 2 3
do
host $i.asia.pool.ntp.org
done | while read x
echo ""
do y="$(echo $x | sed 's/^.*has address //')"
ping -c10 -q $y
host $y
done
--------cut here---------------
Criteria for a "good" host:
no more than 10% packet loss.
max round trip time is acceptably low
deviation (mdev or stddev, depending on which version of ping) of
round trip time is acceptably low.
Enjoy!
Rick
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