[TripleO] how to make that inspection IP is given only to known hosts

Hi all, I have a situation, when in my network, I have loads of equipment, which I do not control. and Inspection range gets occupied quite fast. and in TCP dump I get such messages: DHCP-Message Option 53, length 1: NACK Server-ID Option 54, length 4: DHCPD-IP MSG Option 56, length 21: "address not available" I have disabled: enabled_node_discovery = false Anything else? maybe additional environment options for undercloud I could provide? Than kyou in advance, have a good $day_time -- Ruslanas Gžibovskis +370 6030 7030