Hello,
I am doing my research about TSN over 5GC with linuxptp to sync master with
slave in software time stamping.
My goal is to sync master and slave in different domains connect with a tunnel,
which is linux tun.
Master <———> virtual tunnel <———> Slave
However, the slave doesn’t display the offset message, which isn’t sync.
Here is my scenario: ( pic link: https://imgur.com/a/csZ13yF )

There are two NICs in VM1 which is Master and Slave respectively.
with command ‘ptp4l -S -m -4 -E -i enp0s8’ and ‘ptp4l -S -m -4 -E -s -i
enp0s10’
Then the packet flow will be like the green line in the above picture.
I have checked that vm1 got all PTP packet from Master and Slave, but somehow
it doesn’t sync. (capture with wireshark in vm2)
It works (displays offset msg in slave) when i use gPTP with 'ptp4l -S -i
enp0s8 -c automative-master.cfg’ and 'ptp4l -S -i enp0s10 -c
automative-slave.cfg’.
However, I have to use the UDPv4 to sync.
I think the possible is IGMPv3 packet occurs in UDPv4 case. (I have studied
some works for it, but still not understand at all)
Since i am a beginner in network, can anyone tell me how to configure it ? or
How can i make a change?
Thanks
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