If the IPSec tunnel doesn't support multicast, you would have to use one of the 
unicast based profiles, no?

Thanks,
Jake

From: Taber, Alan <alan.ta...@lmco.com>
Sent: Monday, November 04, 2019 2:35 PM
To: linuxptp-users@lists.sourceforge.net
Subject: [Linuxptp-users] PTP over IPSec?

Hi folks,

Has anyone successfully implemented PTP across an IPSec tunnel? We have a set 
up where we have a master clock in one shelter, an IPSec tunnel via hardware on 
a pair of ICX-7450 switches between the two shelters, and then a second shelter 
with computers that should be slaves to the master clock.

The issue we're seeing is that the IPSec tunnel doesn't support multicast and 
so the initial PTP multicast packet isn't getting through to start the slaving 
process in the 2nd shelter. The equipment in the same shelter as the master 
clock is indeed successfully slaving to the clock, so I know it isn't an issue 
with that part of the setup.

Best regards,
Alan Taber
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