Subject kinda says it all.. We have previously been using chrony to
synchronize systems on a network, and chrony allows slave devices to
specify the ip address of their clock source.

It does not seem obvious after reviewing documentation here that this
is possible:

https://manpages.ubuntu.com/manpages/bionic/man8/ptp4l.8.html

We generally deploy systems in groups where one is the master clock
source and the others are started as "slaveOnly" devices. However, it
is possible that we may have multiple groups like this deployed on the
same network, where there may be a few sources competing to be the
"master clock".. but it is important for slaves in one group always
use their designated master clock, and not any other master clock that
may also be present on the network.

We have considered redesigning our systems so that there is only ever
a single master clock started on the network, with all other nodes
starting as "slaveOnly".. but that would involve adding further
configuration options to our software which would be one more thing
for the system configurators to get wrong when deploying them.

TLDR; can a 'slaveOnly' ptp4l client specify the ip (ipv4) address of
the master clock it wants to use?

Thanks!

Trey


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