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I checked the normal ping test and found it also has duplicates. e.g. PING 100.64.0.3 (100.64.0.3) 56(84) bytes of data. --- 100.64.0.3 ping statistics --- 2 packets transmitted, 2 received, +3 duplicates, 0% packet loss, time 1012ms I'm not sure if I missed some configurations or anything else. How do we make sure there is not duplicates? Another issue during my testing is that the test checks while [ ${WAIT} -gt 0 ] do grep 00:00:00:00:00:00 /sys/kernel/debug/hsr/hsr*/node_table if [ $? -ne 0 ] then break fi sleep 1 let "WAIT = WAIT - 1" done While in my testing the debug log shows 00:00:00:00:00:00 for mac B address during the whole 5 seconds. /sys/kernel/debug/hsr/hsr1/node_table:00:11:22:00:02:01 00:00:00:00:00:00 10026a200, 100265ef5, 0, 1 /sys/kernel/debug/hsr/hsr1/node_table:00:11:22:00:02:02 00:00:00:00:00:00 100265ef5, 100269800, 0, 1 /sys/kernel/debug/hsr/hsr1/node_table:00:11:22:00:03:01 00:00:00:00:00:00 100266140, 10026a200, 0, 1 /sys/kernel/debug/hsr/hsr1/node_table:00:11:22:00:03:02 00:00:00:00:00:00 100269000, 100266140, 0, 1 /sys/kernel/debug/hsr/hsr2/node_table:00:11:22:00:01:01 00:00:00:00:00:00 100269000, 100265ef5, 0, 1 /sys/kernel/debug/hsr/hsr2/node_table:00:11:22:00:01:02 00:00:00:00:00:00 100265ef5, 100269000, 0, 1 /sys/kernel/debug/hsr/hsr2/node_table:00:11:22:00:03:02 00:00:00:00:00:00 100266140, 10026a200, 0, 1 /sys/kernel/debug/hsr/hsr2/node_table:00:11:22:00:03:01 00:00:00:00:00:00 10026a200, 100266140, 0, 1 /sys/kernel/debug/hsr/hsr3/node_table:00:11:22:00:01:02 00:00:00:00:00:00 100269000, 100265ef5, 0, 1 /sys/kernel/debug/hsr/hsr3/node_table:00:11:22:00:01:01 00:00:00:00:00:00 100265ef5, 100269000, 0, 1 /sys/kernel/debug/hsr/hsr3/node_table:00:11:22:00:02:02 00:00:00:00:00:00 100265ef5, 10026a200, 0, 1 /sys/kernel/debug/hsr/hsr3/node_table:00:11:22:00:02:01 00:00:00:00:00:00 10026a200, 100265f98, 0, 1 Thanks Hangbin