Is Multicast a Part of PTP?

The NIC also has a hardware clock. Do you have to run NTP between the NIC and the host system? I think that would be challenging. You can use a thing from the PTP, the Linux PTP project to move time from a network card to the system. It's called PHC2SYS. The cards themselves do also have a clock on them that you're also keeping in sync.

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