Hi,
I have some security and usage question that I would like to have some
input on regarding usage of 802.1AS/gPTP in a product that is connected
to a network that you don't have any control of in terms of which nodes
are connected and their behavior. Consider the case that a product is
supporting gPTP using ptp4l to sync PHC and then automatically setting
up phc2sys to sync system clock from PHC. If a new node connects to the
network that is badly configured or evil with wrong time of day
information and this node manage to become GM the consequence will be
that system time is changed on nodes that have auto sync between
PHC->CLOCK_REALTIME. Are there any settings in phc2sys (or ptp4l) to
protect the system from this scenario? And in general how should a
product designer think around GM trust in an open network using gPTP,
never sync system time from PHC in this case?
Thanks,
/Peter
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