@Freekwilly ok, too bad. In this case it would be great if you can send me packet capture, created as follows:
sudo apt-get install tcpdump -y
sudo tcpdump -i eth0 'arp or ( udp and ( port 67 or port 68 ) )' -s 65535 -w /tmp/capture.pcap
When tcpdump has started please press the dashbutton. When the dash button LED stopped flashing press once again. Wait for another ~15 seconds then stop tcdpdump by pressing <Ctrl>C.
Please send me the file /tmp/capture.pcap.
"It always takes longer than you expect, even when you take into account Hofstadter's Law.", Hofstadter's Law