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tcpdump filter to match DHCP packets including a specific Client MAC Address:

tcpdump -i br0 -vvv -s 1500 '((port 67 or port 68) and (udp[38:4] = 0x3e0ccf08))'

tcpdump filter to capture packets sent by the client (DISCOVER, REQUEST, INFORM):

tcpdump -i br0 -vvv -s 1500 '((port 67 or port 68) and (udp[8:1] = 0x1))'

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