disable dhcpdecline via configuration option
I disabled the DHCPDECLINE feature in the KEA source. In our FTTH access network IP conflict never ever can happen, because of the dhcp snooping based IP- and ARP anti spoofing, so processing the DHCPDECLINE messages from the clients is just a vulnerability. I suggest the DHCPDECLINE feature should be disable via configuration option, global or/and subnet level.