PTP boundary clock stops replying for Delay_Req message after some minutes in Red Hat Enterprise Linux 6

Solution Unverified - Updated 2024-06-14T18:37:31+00:00 -

Issue

PTP boundary clock was configured, and an PTP ordinary clock could sync with it as a slave for several minutes, but it started to fail after that.
Upon network capture, the PTP boundary clock didn't reply for Delay_Req message.
Why does not it send the reply back to the slave?

Red Hat Enterprise Linux 6

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