I fully agree with comment 6 by Perry E. Metzger. Switching to ntp pool should not be a security issue as bad servers are automatically filtered from the pool. Additionally, bad servers are detected by the NTP algorithm if enough servers are selected (they are called "falsetickers", see <http://support.ntp.org/bin/view/Support/SelectingOffsiteNTPServers#Section_5.3.3.>). 4 servers should be enough for most cases.
I fully agree with comment 6 by Perry E. Metzger. Switching to ntp pool should not be a security issue as bad servers are automatically filtered from the pool. Additionally, bad servers are detected by the NTP algorithm if enough servers are selected (they are called "falsetickers", see <http:// support. ntp.org/ bin/view/ Support/ SelectingOffsit eNTPServers# Section_ 5.3.3.>). 4 servers should be enough for most cases.