tcpdump
Filter for DHCP/BOOTP
tcpdump -i any -vvv -s 1500 '(port 67 or port 68)'
tcpdump -i any -vvv -s 1500 '((port 67 or port 68) and (udp[8:1] = 0x1))'
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tcpdump -i any -vvv -s 1500 '(port 67 or port 68)'
tcpdump -i any -vvv -s 1500 '((port 67 or port 68) and (udp[8:1] = 0x1))'