I was facing the same issue. The slave always chose its own clock as the best master clock.
In my case, that was because the UDP ports 319 and 320 required for ptp4l were not open on the master and slave. After adding the iptables entry for ports 319 and 320 in both master and slave, the slave was able to sync its time from the master clock as expected. # *iptables -I INPUT -p udp -m udp --dport 319 -j ACCEPT* # *iptables -I INPUT -p udp -m udp --dport 320 -j ACCEPT* You can refer to this link for details: https://docs.oracle.com/cd/E37670_01/E41138/html/section_kpy_1gh_pp.html Thanks.
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