Since a week I have my DHCP flooded with bad_address and Unique IDs (8digits, always the same last 6 digits ex. xx84a8c0). This makes the pool full and workstations unable to connect the network.
I deleted them and they also came back.
I suspected a rogue DHCP sitting on the network.
I used dhcploc.exe to trace dhcp request and only found my DHCP server.
I did also scan the network for UDP 67 and 68 and found nothing worng.