I've come across a couple of ways to set a single (ex. time.apple.com) NTP server, however I need to set two servers- one for the internal network (a Domain Controller) and a secondary for when users are off of the network (time.apple.com).
I've tried modifying the /etc/ntp.conf file to include a second and third line, and it shows up in the Date & Time Preference Pane (same line, comma separated), but it doesn't work; when I'm on the network, time is synced, but off of the network, time.apple.com isn't used. Any suggestion? Thanks.