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How do we run time sync on our new root DC without disabling our firewall?

We are deploying new servers and PCs and are migrating from NT 4.0 to Windows 2000. We want to run time synchronization on our new root domain controller but we can't even ping the NTP server sites from any machine but our NT4 firewall. How do we get around this without disabling our firewall?
You will want to open the NTP port on the firewall to go to a specific IP address. So you would allow traffic originating from your DC, which holds the PDC (primary domain controller) Emulator role to some time server on the Internet via NTP (TPC port 123/udp). Click here for a listing of US Naval Observatory Time Servers.

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