Keller, Jacob E <jacob.e.kel...@intel.com> writes:
>> > From: Sanjay Bhandari [mailto:san...@ziffusion.com]
>> > Is there a way to set a port in the PASSIVE role with ptp4l?
>> >
>> > Essentially, we want to listen in on the protocol, but not generate ANY
>> > protocol
>> messages ourselves. Nor do we want to set the PHC from any master.
>> >
>> > Is there a way to achieve this?
>>
>> Does using free_running, along with --slave-only do what you want?
>>
>> I don't think you're going to get a mode which only listens and doesn't do
>> ANY
>> messages back out... For that I'd suggest tcpdump and implement a filter
>> that can
>> read the PTP messages and show relevant fields for you.
WireShark has some related display filters, for example:
$ tshark -i sw1p49 -Y 'ptp.v2.messageid in {0 8}'
Capturing on 'sw1p49'
1 0.000000000 2001:db8:1::1 → ff0e::181 PTPv2 108 Sync Message
2 0.000079209 2001:db8:1::1 → ff0e::181 PTPv2 108 Follow_Up Message
7 0.500071357 2001:db8:1::1 → ff0e::181 PTPv2 108 Sync Message
8 0.500152168 2001:db8:1::1 → ff0e::181 PTPv2 108 Follow_Up Message
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