NTP

Comment 2 for bug 2039252

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Richard Laager (rlaager) wrote : Re: The packages ntp and ntpsec are not equivalent

You are correct that the multicast support has been removed in NTPsec. This was intentional:

https://docs.ntpsec.org/latest/ntpsec.html
"Broadcast- and multicast modes, which are impossible to secure, have been removed."

The Debian maintainers of the "ntp" package decided to stop maintaining it. Rather than orphaning it, they asked on debian-devel and the consensus was to drop it entirely in favor of "ntpsec" (which I was already maintaining in Debian).

It would be a pain, but if you wanted to pick up maintaining "ntp" in Debian again, that's theoretically possible. I wouldn't recommend it, and certainly not if the only missing thing is multicast support.

Instead, I recommend you configure all of your clients to speak unicast to your NTP server. This is more-or-less the same effect anyway. It gives you the option to then "upgrade" to NTS (Network Time Security), if you desire.