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NTP port 123 outbound traffic

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Last Modified: 2016-02-25
Hi,

I have been monitoring too many NTP traffic going out through Sophos firewall and they are all blocked by default. The destination of the outbound traffic is many different NTP server location not only one server.

Client PCs are trying to get time information from many locations, how can I make PCs to get their time information from internal NTP server rather external NTP server?

This is the list of IP address that internal PCs are trying to reach to get time information.

207.57.100.235 grapeofwrath.com.au
128.138.141.172 utcnist2.colorado.edu
24.56.178.140 host-24-56-178-140.beyondbb.com
64.113.32.5 nist.netservicesgroup.com
165.193.126.229 nist1-nj2.ustiming.org
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