Hi everyone, 

I have two Linux machine that are directly connected via Ethernet cable 
and both machines have i210 NIC. Both sides run ptp4l.

I tried linuxptp 1.6 and 1.5 with the same result (as it seem something 
wrong on my end). Attached the result I see from both machines. They 
seem to be synced but there is no offset updates as the slave stuck on 
the state "LISTENING to UNCALIBRATED on RS_SLAVE". Thoughts??

** Master side **

bassam@balsanieTestLDT:~/Downloads$ sudo ptp4l -i enp3s0 -m
[sudo] password for bassam:
ptp4l[3390.492]: selected /dev/ptp0 as PTP clock
ptp4l[3390.492]: driver changed our HWTSTAMP options
ptp4l[3390.492]: tx_type   1 not 1
ptp4l[3390.492]: rx_filter 1 not 12
ptp4l[3390.492]: port 1: INITIALIZING to LISTENING on INITIALIZE
ptp4l[3390.493]: port 0: INITIALIZING to LISTENING on INITIALIZE
ptp4l[3398.201]: port 1: LISTENING to MASTER on 
ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[3398.201]: selected best master clock a0369f.fffe.1e2503
ptp4l[3398.201]: assuming the grand master role


** Slave side **

admin@NI-IC-3173-01A8EEF0:~/ptp15/linuxptp-1.5# ./ptp4l -i eth4 -s -m
ptp4l[1465.773]: selected /dev/ptp4 as PTP clock
ptp4l[1465.774]: driver changed our HWTSTAMP options
ptp4l[1465.774]: tx_type   1 not 1
ptp4l[1465.774]: rx_filter 1 not 12
ptp4l[1465.774]: port 1: INITIALIZING to LISTENING on INITIALIZE
ptp4l[1465.774]: port 0: INITIALIZING to LISTENING on INITIALIZE
ptp4l[1473.223]: driver changed our HWTSTAMP options
ptp4l[1473.223]: tx_type   1 not 1
ptp4l[1473.223]: rx_filter 1 not 12
ptp4l[1473.223]: selected best master clock 00802f.fffe.933a03
ptp4l[1480.552]: driver changed our HWTSTAMP options
ptp4l[1480.553]: tx_type   1 not 1
ptp4l[1480.553]: rx_filter 1 not 12
ptp4l[1480.553]: selected best master clock 00802f.fffe.933a03
ptp4l[1488.001]: driver changed our HWTSTAMP options
ptp4l[1488.001]: tx_type   1 not 1
ptp4l[1488.001]: rx_filter 1 not 12
ptp4l[1488.001]: selected best master clock 00802f.fffe.933a03
ptp4l[1494.149]: port 1: new foreign master a0369f.fffe.1e2503-1
ptp4l[1494.994]: driver changed our HWTSTAMP options
ptp4l[1494.994]: tx_type   1 not 1
ptp4l[1494.994]: rx_filter 1 not 12
ptp4l[1494.994]: selected best master clock 00802f.fffe.933a03
ptp4l[1498.150]: selected best master clock a0369f.fffe.1e2503
ptp4l[1498.150]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE



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