Thank you very much for your reply.   Maybe it is no related to DAI.   We connect the LAN ports of our routers to the port 41 and port 47 of our switch MS255. I would like to check the status about ARP packets loss.   In Network-Wide, I can capture the records for the specific ports by "Packet capture". May I have your advise how to check the ARP data packet loss from the output file?   Best regards, ... View more